Car Heaters

Look to see if you threw a fan belt. Check your thermostat. That is the most likely cause. Then check your water pump.

The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.

Feel the temperature of the heater pipes in the engine bay, where they pass through the front bulkhead.

If they are both hot then the fault is most likely the air regulator flap stuck.

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Because the 2004 Mercury has an update suspension. It may not have the soft ride of your 1994 but it handles way better. Ride & Handling is always a compromise. Floating ride = poor handling. Great handling = stiff ride. Somewhere in between these two extremes is a good ride and good handling. Your 2004 is a safer car due to the fact that in an emergency situation, it will handle better and has less body roll. This can be a big plus when you need to make an emergency maneuver or when going around curves.

That happened in my 1983 Mercury Villager and the problem was a blown circuit on the A/C circuit board. I soldered it and it worked. I found this solution online but I don't have the URL. Sorry. You have to remove the A/C unit from your dashboard and you'll find the circuit board there. The blown circuit will be near the corner of the board. Good luck!

I had the same problem, I went to the link below and clicked on topics. You'll find a detailed fix that costs nothing, worked perfect for me. Good luck. http://home.earthlink.net/~vqfaq/

sounds like blockage in the cooling system. See if you are not low on coolant in the radiator. Just because your reserve tank has coo;ant does not mean that you have enough coolant in the radiator. If you have low coolant in the radiator, it will blow cold. It can happen abruptly. If you are low on coolant in the radiator and not in your reserve tank you will need to find out why the system is not pulling coolant out of the reserve tank.

You still have a blower resister assembly, wiring, and a blower motor itself, in that system. Any one of those could have a problem. You need to use a test light at the blower motor connector and see if you are getting both power and ground. If you are missing a ground, most likely you have a bad blower resister assembly. If you are mssing power, check fuses and wiring. If you have both power and ground, and the motor isn't working, you need a blower motor. I have also found that sometimes tapping with a screwdriver handle on the motor will make it come on, and if that is the case, then again, you have a bad blower motor.

Low coolant, failed thermostat, partially plugged heater core...............

You first have to make sure that there is no freon in the system and if there is none then you loosen up the fitting, the manifold or whatever and just remove the old one/ones and replace them with the correct one/ones...........

replace the thermostat which is located in the housing that the top radiator hose attches to the engine

With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!

if car is blowing cold air, you need to check the thermostat,the heater core, and the heat control. the coolant will not blow cold air unless there is no coolant at all in engine,then you have bigger problem anyway

possibly you've got a stuck up water valve that's why the hot water continously flows to the heater coil, for the meantime to cut it off open the car hood and look for two rubber hose that is being connected to the engine side and the other end is connected to a aluminum or steel tube that is coming out of the dust board front in the hood. it is the water supply going to the coil heater inside the car. Remove the hose clamp ( engine is cold ) and put a temporary plug to both hose. Then have the heater valve and coil be check by a qualified car aircon tech.

I assume you are talking about the cabin tempurater control, and in that case, it depends on the year. Usually, on the older ones, it is a simple valve in the heater hose inside the engine compartment, controlled by a cable from the dashboard. On others, it is inside the heater box under the dashboard, and a royal pain to get to. Get a manual for the model year and it will tell you not only where it is, but how to get to it.

It could be low coolant or it could be that the water pump impellers are rusted or worn through.

Your thermostat is most likely bad. It controls the flow of warm water into your heater core which warms your air. Its a common problem in winter and an easy fix.

Doesn't have one. Temp is regulated by a blend air door that meters airflow across the heater core. If you're having temp problems, check out the blend door motor or the operation of the blend door iteself.

Rick

I'm a retired ASE Master/L-1 Technician. I still keep current with the latest automotive technology. Visit my blog for cool articles and TSB's: http://free-auto-repair-advice.blogspot.com

if you look to thte left of your pedals you will see the cover which is attached to the radio and dashboard etc, pull it off and you will see the wire and the bit of plastic it attached to , the wire will have come loose but you can adjust the heater to cold or hot from there but you have to keep the cover off.

i hope this helped.

Check your ductwork under the dash it sounds like it has come loose not a big deal to do.

In order for the heater to work, the radiator needs to be full of coolant; if it is , then run engine for 20 minutes and check temp gauge; is it at operating temperature? If not replace the engine thermostat; if it is at operating temperature then take your hand and place it on both heater hoses; are the both hot? if only one is hot then your heater core is plugged and it will need to be flushed or replaced if you cannot flush it.( The heater hoses are on the passenger side and go thru the firewall) I hope this helps you. Mark

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

Your thermostat might be stuck open. Does the radiator cap get hot after running the engine for 10-15 minutes? If not, replace the thermostat.

Could be a problem with the vacuum system (leak at hose or motor either under hood or dash) if air is being directed to defroster (this is default position) Could be a plugged evaporator if no air at all

i imagine that the car itself is in good working order so to that effect the computer may be pulling timing to avoid detonation based on the inlet air temperature.

Maybe a 4 cylinder and just reacting to the additional engine power draw of the air conditioner compressor noticable as compressor cycles on and off