The car is overheating and the heater doesn't work Is there a connection?
Yes. Your thermostat has gone bad, not allowing the water to flow freely through the radiator. They are generally very simple to replace. Your local auto parts will help most often.
The connection is that both functions (keeping your engine at the proper operating temperature and providing a source of heat to the passenger compartment of your car) rely on the flow of "radiator fluid" through your engine.
First a basic description of the system. A thermostat located on the top of your engine has a hose just about big enough to get your hand around it connected to it's housing. The thermostat normally stays closed until the engine radiator fluid temperature gets to 165 to 190 degrees (half to 3/4's on a temp gauge on your instrument panel). It then opens to allow flow. Radiator fluid flows from the thermostat through a hose just big enough to get your hand around to top of the large radiator at the front of the engine compartment. The fluid flows through the radiator and ram air from driving or fans mounted on the radiator cool the fluid before it flows out of the other side on the bottom (same diameter hose) to the water pump mounted on the engine. When the fluid gets hot it expands. As small diameter hose from the radiator cap filler neck allows it to escape to a plastic overflow reservoir in your engine compartment. From the water pump, most of the fluid flows back to the engine to collect heat again but a portion of it flows to the heater core (a small radiator) typically located in the passenger compartment behind the dash. Air from a blower is heated as it blows through the heater core and into the passenger compartment.
The troubleshoot: What can restrict proper flow? Low fluid level (internal or external leak, air in system, evaporation over a very longer period of time), thermostat stuck closed, water pump failed or clogged internal passages.
Note: Always take safety seriously. Engine belts and fans grab loose clothing or hair. The cooling system has extremely hot poisonous fluid under pressure [gloves, splash goggles, proper disposal].
With a cold engine, check the reservoir level. It should have a cold level line. Service to line. Remove the radiator cap and check the level. If low, service, replace the cap, start the engine and look for external leaks and if dry see check if you have heater function and cool engine. Keep an eye on the level over the next couple days. If it goes down, get to a qualified mechanic to check for exhaust gas in the fluid (head gasket). If it's full, try squeezing the upper and lower hoses quickly and look for bubbles in the cap filler neck followed by a drop in the fluid level. This is air in the system that could slow or restrict flow or proper temperature sensing. Service and repeat until the level stays full. Many engines have bleed taps just downstream of the water pump and thermostat (looks like a small hex head bolt screwed into a slightly larger hex head bolt). With engine running and the smaller hex turned no more than a 1/2 turn counter clockwise, a steady flow of fluid should drain from it when the system is air free. If you can't get this it may take a qualified mechanic to thoroughly bleed the system.
To check for a stuck closed thermostat, feel the upper and lower radiator hoses when the engine temperature gauge is between 1/2 and 3/4. Be very careful, both should be getting hot. To be sure about the thermostat function, it can be removed and checked in a pot of water on the stove, actuating open just before boil.
If the fluid level is good, you know the thermostat works and the system is air free, flow could be restricted by blockage. Again I'd recommend a qualified mechanic to do a system flush and/or radiator replacement.
Water pumps usually leak a great deal out a weep hole on the bottom when they fail which is pretty much a mister obvious before you do all the above.
24 people found this useful
Answer I will firs verify is the climate control is working (the dash board) controls, and then work my way up to more complicated issues. There are to important by pass that could be clogged also, if water has been used instead of coolant. well for one it could be the heater blower motor or it cou…ld be the control under the dash that changes it from hot air to cold air if the spring spring breaks it will not get hot. Hope that helps Try changing the thermostat. If it is stuck open or failed, engine temp will not rise. I had same problem on 95 explorer, changed thermostat myself and solved problem. Answer It could be the water pump but most likely the antifreeze is low and needs to be filled up to be able to circulate through the heater core. need more info. you could be low on coolant.for all we know. there are alot of different parts to a cooling system which bring heat to the cabin area. start simple. ck fluid level make sure it is full when cold. 2. when running does it circulate through the hoses. 3. are your heater hoses hot. both. 4. does your fan blow in all possitions & does air come out from your vents? Answer A heating system works by diverting hot coolant through a heating grille where it warms up air which the fans blow in whichever direction and whatever speed you specify. Basically there are two parts to the heater system, there is the heater tap, located in the engine compartment. It controls how much (if any) hot coolant goes through the heating system in your car. Probable causes are a leak in one of the hoses, the heating grille itself (you will smell coolant in the car) of the radiator is not sufficiently topped up with enough coolant to circulate through the system. If not turn your heater on to full, turn your car on for a short while, turn it off and top up the coolant. Also bleed the air out of the system if necessary. The second part is self explanatory, the fans blow the hot air around the car if the problem is not with the first part above, it would be best to have it taken to an auto electrician. first thing you need to check is your fuses .It is actually the heater motor, sam thing happened to my 2000 Alero ( Full Answer )
check the fluid level in the tank or radiator. Check the top radiator hose when the car is warming up, is it hot? If not it might just be your thermostat that needs to be replaced. Or it could be that your heater core is plugged up. You don't say how old a car this is in, some times you can take off… the heater hoses and connect a garden hose to it and back flush it and get some of the junk out of it, just don't turn the hose all the way or out can blow a hole in the heater core, then you have a mess. If you are not handy, you can go to some place that power flushes the cooling system and that may fix it also. Just hope you don't have to get a new heater core as they are a pain to put in in most cars and costs a lot to have some else do it. The core doesn't cost much but the labor is a lot. ( Full Answer )
[first time answering questions] car heater works like the reverse of the normal cooling radiator - in fact the heater is like a small version of the rad that's on the frnt of the car - the hot water from the engine block goes into this small rad and the heater fan blows air thru it into the car - t…he hot heater rad loses heat into the car and - bingo - you get warm inside ( Full Answer )
Why doesn't the heater in a Vauxhall Frontera work with the switch on the dash although it does work connected directly to the battery?
Possible solution to fan not working . \nsounds like similar problem i had, it was a faulty switch on the control panel. i got a new panel and fitted and now it works as new. hope this helps
Answer . Maybe it is out of antifreeze? If older car, maybe you need the radiator and heater flushed.
Many reasons: low coolent, stuck heater valve, stuck flap that direct the heat to the cab, clogged heater core.Find the pipes the feed the water to the heater, they are on the right side of the firewall at the rear of the engine. Two rubber hoses connect to them. Warm up the engine and turn on the h…eat. Check the before mention pipes/hoses and see if one hose is hot and the other one is less so. Hottest water in from engine slightly cooler going back to engine. If they are the same temperature your heater core maybe plugged. ( Full Answer )
Answer . \nhave you checked the fuses? if so, maybe the heater core needs replacing
its a 96 caprice already changed the thermostate fans are working . Answer . Do you have an obvious leak,making the engine short of coolant? If no obvious leaks,the first place to look is the thermostat,these frequently fail shut,so restricting the coolant flow. You don't say what sort of car i…t is,or if this happens only in traffic (radiator fan not running) or just driving along,thermostat,blocked radiator,cylinder head gasket. Modern cars must have good quality antifreeze mixed to recommendation for good cooling and anti-corrosion. ( Full Answer )
There are many possible reasons. You need to start by checking- 1. coolant level- If it is low, refill and recheck. There might be a coolant leak and you can get the system pressure checked, could be a blow head gasket. Coolant has a smell that is unique, if you smell something check for drip marks …under the car after being parked. A leak from the radiator, hoses, temp sensor will usually have a residue/color stain. 2. check to see if the fan is working- a blow fuse/relay/motor if it is electric. If it has a clutch, check for clutch leaking fluid. It should have resistance when manually spinning when the engine is off. 3. check for debris in the grill radiator, blockage will reduce air flow. 4. Is the check engine light on? Have the codes read, it can diagnose sensor faults, misfires, blow head gasket. 5. Has the thermostat ever been replaced? with the engine warm, check the coolant return hose to radiator is warm, be careful if you have a mechanical fan. If the engine is at or above normal operating temperature and the hose is not hot the thermostat is stuck closed. ( Full Answer )
Answer . Blower motor working?. Check coolant level System airbound? Bad thermostat? Control cable not adjusted or working properly? Selector switch not working?
It seems to be a common problem with alot of Honda vehicles for the climate control fan to stop working, it is most likely either the blower resistor or the blower motor that will need replaced, I have had the same problem on my 2004 civic and it ended up being the blower resistor wich for some reas…on can only be purchased at a Honda dealership, good luck and hope this helps you a little. ( Full Answer )
Answer . you need to bleed the air out of the heater core. The water pump draws coolant through it and if the cooler isn't full of fluid,it won't work. loosen off the hoses and allow the air out being careful not to get burnt if the engine is hot.
Answer . Low coolant?. Heater core airbound, restricted, or plugged?. Bad thermostat?. Water pump not circulating coolant?
Lots of reasons, but the most common is a broken blend door. This door regulates whether air is diverted through the heater core or not. When it breaks, it can block air flow and cause a loss of heat(or AC, depending on the position it fails in). Check heatertreater.net for diagnostic and repair inf…ormation. ( Full Answer )
Low coolant?. Bad thermostat?. Heater core airbound, plugged, or restricted?. Water pump not circulating coolant?. Temperature control not working?
Heater core may be air bound and have to be bled. Heater core may be plugged or restricted. Thermostat may not be opening allowing coolant flow to core
I have a '99 Cirrus, where both the heater and A/C did not work - I ended up having to get the fan engine and rad changed out - $1500 I believe....
When you set the control, if you chose defrost, it usually does it at the temperature you specify. So if you want heat only blowing through the windshield vents, which I believe may be the question you are asking, it varies between makes of cars. This is what to look for : defrost, fan speed, temper…ature. If you mean "Can a car that only has a heater ( no air conditioning ) be used to defrost?" The answer is still yes. I believe the question is missing words. It is comparable to asking "Hand, just finger work?" You might try asking again, being more specific, explaining why it is a problem. ( Full Answer )
Three possible things: 1) broken fan belt 2) stuck thermostat 3) the most expensive would be bad waterpump.
The engine has to be running and warmed up for the heater toproduce hot air. So yes, you need gasoline to get heat from yourcar (unless you have an electric car).
It depends on what you mean when you say "heater" doesn't work. Does cold air come out your vents? Or does no air come out at all? If air IS coming out of the vents and it is cold, first I'd check to make sure you have enough coolant in your system. Second, I'd find the coolant lines that run from… under your hood, through the firewall, and into the heater core. Grab them under the hood, and see if they are hot. If they aren't, something isn't allowing the coolant to flow to the heater core. If they are, your problem is at the heater core. It could be plugged with gunk, or the door controlling air flow over the heater core and AC evaporator is binding in the cold position. If air ISN'T coming out of the vents, that means your blower motor isn't working. First locate the fuses, and make sure they are ok. Second, check for power at the blower motor itself. If the motor is getting power, check the ground. If the ground is good, and it has power, your motor is dead. If it doesn't have power, check for power at your resistor. This is what sucks up the extra electricity from you fan speed control on your dash, in affect controlling how fast your blower motor spins. If that has power IN AND OUT, your fan speed control on your dash board is probably no good. Either that or the control on your dash isn't getting power. Good luck! ( Full Answer )
The heater motor blower might not work in a 1995 Dakota because thewire harness behind the glove compartment came apart. The radiomight not work because of a fuse.
Check the coolant in the 96 Taurus. Check to insure that thethermostat is working properly, and that the water pump is working.
The battery runs a fan that pushes air through the residual engine heat in the heater radiator into the car.
Grand vitara overheating but putting the heater in the car on seems to make it fine no sign of water and oil mixing and the fan works thermostat water pump and head gasket all changed any ideas?
check radiator cap. there is a small release valve in it that may be scaled up and stuck. a wee scrape and hopefully all will be well. make sure that radiator is full at the same time
Since the engine manifold is higher than the radiator some time an air pocket develops. and the coolant will not circulate through the heater core.. There are 2 bleeders, one is on the black metal line front of engine, pass. side. The other is on the thermostat housing.. Sometimes you can bleed t…he air out, some time up have to put a small pump on the black metal pipe by the bleeder and pump the intake and heater core full before it will circulate on its own- It is a pain. ( Full Answer )
Often when a car radio in not working a blown fuse is the culprit.It also could be a wiring problem or a defective radio.
i had this problem ( but i might not work for you here is what i found) you have to check the fluid levels in you rad when cooled down you might not have enough coolent.
it is because the water pump has failed and the blades or fins have rusted off,check your cooling system and it will be full of rust and needs a new water pump
I have a 97 Buick Lesbre thermostat control temp blink every time I start my car and also blow cold air out what could be the problem?
Might be the knob inside the car!!I looked for fuses under the hood and all kind of things on my 1993 and it ended up being the knob for the fan motor was cracked!! It was turning like normal but it wasn't turning the metal sleve it goes on!!
If it blows warm while idling and cool as you accelerate down the road, the coolant is low and or doesn't have proper mixture for your avg. temperature.
Take a look at the fuses, thermostat, and for more info.. Check the Related links provided below.
If you have lost a sufficient amount of coolant this will stop the heater working because there will be no hot water in the heater rad.
A heater control valve is simply a water valve which allows more or less water to circulate through the heater core, depending on how much the valve is opened. When the engine warms up it heats coolant (mostly water) in the water jacket of the engine. To keep the engine from overheating, the water… pump circulates water through the radiator once the engine temperature reaches the set-point of the thermostat. When it's cold outside the engine STILL reaches a temperature that allows you to make use of the engine heat when you open the water valve of the heater. Heater control valves take many forms but basically they all do the same thing; they open to allow heated engine coolant to circulate through the heater core or they close to stop the coolant from flowing. Heater control valves can be manual (cable controlled or even lever controlled), vacuum (which allows the engine vacuum to control the position of the heater control valve based on where you set the control knob) or electrical which allows for greater flexibility and even allows the auto manufacturer to connect the heater controls to a computer or other electronic control device. ( Full Answer )
Try checking your coolant level. If that's fine it may be your thermostat staying open and it may need replaced
If you cannot change the temperature from cold to hot on an Equinox or Pontiac Torrent, a common cause is a broken temperature door . This is a very difficult repair. ------------------------
For both your heater and air conditioning not to work means you either broke a belt or the belt is loose.. Overheating would also be caused by this, because your water pump is driven by the same belt.. Do not drive it until you get it fixed, you'll kill that engine by overheating it.
Usually when you're continuing to operate a severely overheating car, your rings are destroying themselves on the cylinder walls.. This results in less compression, oil consumption and loss of power.. Assuming this is the problem, having the engine rebuilt is the only solution for this.. You can …take it to a mechanic and ask them to check the compression in your cylinders, and they will tell you if this indeed the problem. A compression test won't be expensive... having the engine rebuilt is another story. ( Full Answer )
Shut it off! Let it cool. (this may take an hour or two) Check: . Coolant Level . That the air to the radiator is unobstructed . The drive belts for water pump etc are working. . that the enigine has oil If all these check as proper the car will have to be checked by a qualified person.
Yes, portable car heaters do work, but it is best to look atreviews of different kinds before purchasing them. Make sure tocheck whether it is simply a car heater or a car defrost/defogger.
That depends on what it is doing. If the fan is not working, it is the motor, fuse or wiring. The most likely cause of motor not working at all is the fuse. Second case is the motor. If the fan only works on high, the resistor block is bad. This is located inside of the air venting system. There are… about four wires going to this resistor block. They ocassionally burn up. Now, if the system has a fan, but no heat you have one or more of three issues. You are low on antifreeze, your heater core is blocked or your thermostat is stuck open. Check the level of antifreeze. That is the easiest and most likely. If low, fill! If the heater core is plugged you can remove both hoses from the heater core and if you are cheap, like I am, connect your garden hose to the system for a few seconds. This blows the plug out ALMOST every time! The thermostat will cause very little heat for a long time but of you run long enough you get some heat. They usually stick closed for me, but have been known to stick open. I wish you well! ( Full Answer )
If you are not getting heated air blowing from the heater core andyour engine coolant temperature gauge is showing LOW or below normal , ( then YES , IT'S POSSIBLE that your engine cooling thermostat issticking open )
my heater doesn't work in my 04 Chevy impala. My coolant levels are correct, and this still does not correct the problem. Could it possibly be the coil in the dash. If not what could problem be?
You should probably get an engineer to look at that. usually it is because it has simply worn down and needs replacement. this has happened twice to me.
check the fuse, the relay, the switch and the blower motor resister. If these all check out could be the blower motor its self is faulty
i ask my self the same thing i could tell u i have wasted over a gallon of fuel just trying to get it working **** just feel like breaking it
I am going to assume that you are pondering why the heater only maintains heat while the engine is running. The answer is quite simple. The engine uses a combination of anti-freeze and water to help keep it cool. The water is circulated by a water pump. The hot water moves through the heater core, w…hich is a small radiator. The blower draws air through the fins of the heater core and heat is pulled from it. The water pump is usually belt driven, and the engine must be on in order for the coolant to circulate. ( Full Answer )
If you are getting no heater fan inside, then probably the heater blower motor resistor or fan motor. If the fan blows and you get cold air, then check the coolant level in the radiator first. If coolant level is good, then check to make sure the heater control head in the vehicle is actually on hea…t position, with regards to the heat door down below under/behind dash. Sometimes the actuator door/heat blend door get's stuck or broken in one position. Also could be a stuck thermostat or clogged heater core. If a clogged heater core, could try switching hoses at firewall to unclog. ( Full Answer )
There may be various reasons. The fuse my have blown. A loose wire or other part. A faulty part. It's over 14 years old and simply expired.