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My daughter has a 2000 Concord that has a problem with emitting hot air from the inside vents. The ac works just fine as does the vent, defrost (but no hot air from the defrost) and recirculating of air but no hot air from the heater. I have checked fuses and looked for any hose that may be loose but have not found any problem. The temp gauge reads normal, half way between cold and hot.
Could you tell me where to start looking for her problem? If it is a blend door problem how do I reach to where the problem may be?
Thanks in advance.
Answer -
Hi Landon,
I may be a bit out of date for the 2000 but if the 93-97 Haynes manual applies to her car as well, then there would be two main possibilities: the hot coolant is not circulating thru the heater core or the blend air door is not moving properly. Let's focus on the first one. If you can look behind the engine at the firewall area there should be two rubber heater hoses side by side passing into the cabin. When you have the heater set for heat and the engine warmed up check to see if the hoses do or do not feel equally warm. If they do, then the coolant is circulating and the blend door is the issue. If only one is warm and the other significantly cooler then the coolant flow is the issue. So let me know which is your case. Also, does the control panel have a lighted digital temp readout, or is the conventional sort of control with only three knobs and 2 push buttons?
Roland
Thanks for a quick response.
It must be the conventional sort of control because there are three knobs and 2 push buttons. As for the hose I will have to check them later as she has the car.
Answer -
Hi Landon,
O.K., I'll await the results of your evaluation. There is a built-in diagnostic capability of that control unit which will tell us which if any of the control systems is suspect of malfunction. But let me know first if the water appears to be circulating properly or not before I type-in the way to to do it and to interpret the result.
Roland
Well, I don't know what happened but when she was here today the heater was blowing hot air. What can I say? What do you think may have happened? She was low of water a few days ago and I filled the reservoir. Could this be something that may have caused the problem? She does have a small leak somewhere but we have yet to find it. It is somewhere around the front of the motor (I think), where the large hose ties to the top of the motor. She said at one time she heard a hissing sound but I have not seen nor heard anything. There is a little water at the spot mention above. What is the fitting on top of this area that looks like an ac valve? Also what is the sensor that is screwed into the side of this area? The area may be the thermostat?
This car is all Greek to me, ha. I work on my GM cars with no problem.
Thanks for your time.
AnswerHi Landon,
The answer might be that there was an air bubble in the heater core circuit that impeded the coolant flow thru it.
Yes the area of the large hose and the manifold to which it attaches also is where the thermostat is installed. The sensor is the coolant temp sensor, and the fitting is a bleed valve to allow air into the system when draining it and conversely to allow air to escape when refilling the system. So keep an eye for water leaks around all those devices, and of course the water pump is in the same general area though down lower and builtin to the front of the block.
It is interesting how different the various manufacturers design and engineering practices are such that we are thrown when jumping from one to the other. I feel the same about GM and Ford!
