At the end of last winter i had no heat. two weeks ago i figured i should try to fix it. i put a new thermostat in it (195) it gets up to temp. but i still have no heat. when i turn the hot-cold knob all the way over to hot, i can feel heat for a split second and then it is cold again. if i turn it to the floor or the de-frost and turn the fan on it is cold. only time i feel heat is when the knob is all the way on hot and the fan is off, but the heat is only there for a second. Any ideas?
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Connie this sounds like your thermostat in the engine is stuck open not letting the water stay in the engine block to heat up. The fix is to replace the thermostat with a new one that will allow the water to stay in the block to warm up. The typical symptoms of a stuck open thermostat is that the air will blow somewhat warm but never hot in the winter time, but it will take a few miles for the air to warm up at all. I would check with the dealership and find out what degree thermostat to replace it with. I run a 180 degree in the summer and a 195 degree thermostat in the winter just to have hot heat in the winter. I hope this helps
Hello. You are in luck. I just had this same issue in my shop this week. We changed the thermostat, and replaced the coolant. Fixed it right up. Since you did not mention a new thermostat, that would be my next move, if I were you.
If you are certain there is no air in the coolant system, then there is a chance that the blend door motor is not working or the heater control assembly is bad. since you have replaced your own heater core you probably noticed the the doors inside the heater core housing. One of those doors is controlled by the "hot/cold" knob. The motor on that door could bad.
I had an overheating problem with my 2001 300M....removed the thermostat two years ago and have never had a problem since....it does get cold in the Winter but warms up enough so you don't freeze. I don't think most service centers know that the thermostat goes in BACKWARDS from most cars...due to the coolant coming through a small line through the head....which often gets clogged up...thus the thermostat doesn't work properly. I just decided to remove the thermostat and have had no issues with the car driving it that way.
well lets just start at the beginning the thermostat failsafe thermostats are great no doubt and not to cheap but what you need is a new 195 degree thermostat if your car was built in the south it may have had a 190 from the factory 195 is universal for north to south buy a good one not a cheap one or you will pay later the failsafe can also get cocked around a little letting the radiator overcool let me know if this helps