I would say that your heater core is ok...it sounds like you have a bled door promlem in the dash.
ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?
it is a heater. heat. it blows heat. warm air
The thermostat could be stuck closed. the heater core could also be plugged or the door closes when you use ac and opens when you use the heater may not operate.
Blown Heater Core - The heater fan blows past the heater core and if it has a hole in it your antifreeze ios being blown onto your windshield.
The motor which blows air through the vents.
If the coolant level is okay, I would suspect a restricted heater core. Try flushing the heater core.
No fuse for those symptoms. Could be low on coolant. Bad thermostat. Plugged heater core (my guess). Temp blend door problems.
The line or core is probably plugged, or if it has a manual or vaccum switch check to see that it is not corroded. If it moves freely, I would find both lines to the core (heater), disconnect them and drain as best you can. I would pour some flush into the lines and let it sit in the lines/core for 15 minutes then attach a garden hose and flush the crap out. I usually install some cheap clear plastic tubing on the core/lines to let gravity help me and to direct the waste away. Remember to top off the rad.It will heat good then. I hope this helps you. Mark
because the heater uses hot coolant/antifreeze to heat your car....the coolant passes thru the heater core, then a fan blows the warm air thru your vents Your heater core is leaking and must be removed and repaired or replaced.
most likely your heater-core went bad. if you car runs perfectly fine besides having heat. if you car gets up to normal temperatures, doesn't over heat. the fan blows, but just blows cold air. then it is the heater core.
check heater core could be cloggedCheck the engine coolant level also.*no, the heater relies on the engine for heat and when you drive the engine warms generating heat:)*
This would indicate that the system is low on coolant when the gauge is hot. Not enough coolant to service the heater core.
Only blows cold air with the a/c on while driving, your cooling fan or fan clutch is bad depending on the year, make and model.......... Only blows cold air with the heater on while driving, you will have a bad or broken internal a/c - heater control door.....
air pockets in the cooling system, start by bleeding the lines, plus there is a bypass for the heater core when you have the a/c turned on, or your heater isn't on, this fluctuate between makes and models. but i would go to youtube and look up how to bleed coolant lines, and that should make it easy for you.
The heater hose vacuum operated switch that sends (and recirculates) hot antifreeze to your rear unit is stuck open. It is usually located in the near the radiator - or you can simply trace the heater hose lines underneath the vehicle from the rear unit to the front of the van.
Yes, if the blower isn't working. If it turns out to be the fuse, and it blows again, you probably have a bad blower motor.
Any heater that only blows luke warm air isn't getting warm or hot water to the coil. This sounds like a problem with the thermostat not closing, and allowing the engine to heat the water properly for the heater.
no.....the heater would have to be leaking
Assuming the blower fan is working but it blows cold air, it could be,Faulty temp blend door actuator.Plugged up heater core.Faulty thermostat,Low coolant level,
You would find the HVAC vacuum line routing in a shop manual for that vehicle.
No because the shape would have two right angles because of the parallel lines and the limited number of angles available...just no.
Sure. You can by-pass the heater core but you won't have any heat for defrosting the windshield should you need it.