Question about Chrysler PT Cruiser
When you turn on AC, engine engaged with the AC clutch therefore it increases the engine load so the RPM supposed to go higher to compensated for the load.
1- Since the computer didn't tell your engine to increase the RPM that was why the engine acted like it wanted to turn off due to more loaded on the engine.
2- The ECM knows this by a vacuum sensor, but if it didn't sense a change in vacuum level then computer won't give command to increase the RPM.
3- There is a flap valve operated by vacuum to direct air flow from either Heater core or from Evaporator depending on driver demand.This valve is also operated by vacuum switch to change its position to direct air flow.
4- It blows hot air since the flap valve is directing air from the heater core to you. Later on you get cold air since at this time cold air the Flap valve already directed air flowing through the evaporator. Do it takes some times for your divert flap to open.
The conclusion is that you have a weak vacuum through this path. This means you have a vacuum leak some where in any of your engine vacuum line. Good luck in addressing the issue.
Posted on Sep 06, 2009
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Posted on Jan 02, 2017
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