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I had a similar issue and queried it twice with the dealership and my tyre guy. The tyre guy was the most helpful told me that the ECM looks for the temperature to rise so many degrees in a certain number of minutes and points to a failing thermostat. Like you I said my heating works fine. The Engine Light bugged my so the next time I got my Winter/Summer tyres changed, I had the thermostat changed and the problem was fixed. You need a new thermostat.
sounds like the temp sender could be misreading or the thermostat might not be opening fully, so i'd get that checked , th a/c may need regassing , keep me posted if you wish
after changing thermostat was system bled correctly. also check relay and fuses, as well as door actuator under dash that allows door to swing from heat to a.c. sometimes switch goes bad, also make sure a.c. compressor isn't continuously running, some cars do but most do not. last but not least check to see if heater core is clogged hope this helps thanx
Ok, here is my take on your problem. As you may already know, it takes a car a few min. to actually warm up to operating temp. When the coolent reaches operating temp. the thermostat opens to circulate the coolent in the radiator. Now, as your drive, the air pushing against your car will actually blow some air through your heating system ducts and into the passenger compartment. Is it possible that your blower fan isn't working? Because while you are stopped, there would be no air forcing its way through your ducts, thus no heat. As your drive, your car gets up to operating temp, heats up, and the air pressure as your drive will blow some heat out into the passenger compartment? On a side note, if your thermostat is stuck in the open position, it would take it forever to warm up since it is circulating ALL the coolent even tho it isn't at operating temp. A thermostat stuck open will take 30 min or more before you actually feel any warmth, if at all in the winter.. your thermostat opens and closes constantly as the engine is running to keep it at its normal temp, usually around 160-180 degrees. If you live where it gets really cold, a thermostat stuck open likely will never get warm. If your blower motor works, and your engine don't overheat, im 98% sure its your thermostat.
Check the Relay in the Battery Junction box it is the 3rd one from edn oposite if 3 small fuses close to it with a 5 amr fuse in the middle. Hope this helps it realy should from the sounds of it
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