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Re: more symptoms troubleshooting lack of heat... Posted by Ari [Email] ![]() ![]() In Reply to: more symptoms troubleshooting lack of heat..., rsfeller, Mon, 16 Aug 2004 04:17:08 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The AC system will be running for a bit even if you are calling for heat. The AC system tries to keep the cooling fins cold; I don't believe it really cares what you're asking for in terms of cabin temp. The AC system disengages the AC compressor when (1) it's below freezing outside, (2) system pressures are too high or low, or (3) if it detect frosting on the cooler. In hot/warm weather, all the AC control loop tries to do is keep that evaporator cold.
As to a sticking relay, the only relay is the AC compressor clutch relay, and you know that it's working because OFF turns it off. All of the rest of the control system is not relays, but electronics.
It's up to the ACC system to mix cold air from the AC system with hot air from the heater core. The heater core is always hot (or as hot as the engine coolant temp). The ACC can set the flaps so it gets nothing but hot air.
For a thermostat stuck open problem, you would see the temp gauge on the dash being very low - barely out of the green. And frankly, assuming you're in the US, it's pretty warm. So even a stuck thermostat car will get up to temp - it just may take a while.
Have you checked the condition of the flap arm? (See previous post). Remember, a broken flap arm WILL NOT produce an error code.
posted by 192.249....
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