Mine starts on regular AC. mode then from an Idle like at a red light it will switch over to "re-circulate"mode and start blowing warm air. While still showing in normal AC. mode. After I pull out and step on it it reverts to normal operation, and cools down. II having the same problem in addition my when i press the A/C button I hear a clicking noise from the engine bay. It some sort of a popping noise like if its trying to to come on but it still blows room temp air. Any ideas as to what it can be?
Your radiator cooling fan is malfunctioning
cold engines hve high idles because the pcm is dumping fuel into the motor in order to increase engine operating temperature. when speified temperature is reached, the amount of fuel is decreased an the rpm drops down to the lower idle speed
Acceleration Cable broken broken, you dump!
Adjust the idle screw.
zyou tps might be bad
that is a computer problem you will need the proper reader for it and that is about 4000 so just take it in it is only about 40-60 dollars and they will tune it right
On my Chevy truck it idles high when its low on antifreeze but if its not that more than likely its usually a vacuum line loose or cracked. good luck.
why does my 4.75 BRIGGS & STRATTON lawnmower engine idles high and low when cutting my grass
Need a little more info. What Model and year of the vehicle?
Needs a Tune up
If the engine idles and revs up okay in neutral, it is likely the torque converter clutch lock up solenoid.
Have vehicle scanned to determine problem and recover codes Could be a bad coolant temperature sensor