My fellow technician is offline and I will be assisting. He posted an excerp and it mentioned either carb or injection to cover both.
For your model the IAC can cause the problem of high idle but quite often it is the fast idle valve that is the culprit. However high idling speed would not cause the AC to blow hot air. In fact a higher idling speed should have the AC working colder. This should be a separate problem.
The fast idle valve is located under the throttle body. Remove air intake hose and at bottom of throttle body you would notice an air passage, if covering it with your finger reduces the idling speed, the valve has worked itself loose due to a hardened O ring.
If it does not reduce the idling speed, cover the upper air passage, if it reduces the idling speed, the IAC is afulty.
If both does not reduces the idling speed, you have a vacumn leakage after the throttle plate, could be brake booster, PCV or inlet manifold gasket.
Monday, April 6th, 2009 AT 10:24 AM