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Why is engine stalling when ac compressor comes on?

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Sounds like there is a posibble electrical short somewhere ,possibly
in a thermo fan,as usually are allways on when aircond is on,
(air-con compressor could be seized?) also Cheak IAC valve if there is one on the back of the Throttle body here is a link that you may also find helpfull

Posted on May 13, 2014

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Car will stall when ac turns on?

Given that the condition only occurs now when the AC is active, I would say the issue is likely with the AC. If the compressor is bad, or there is some other issue causing resistance with the AC system, it can really load the engine and drag it down. Also, the AC compressor uses a lot of electrical current which can load the system as well, making the engine work harder. Try disconnecting the connector to the AC compressor clutch and see if the problem still persists. If it goes away, you know your problem is with the AC system. Honestly, by the sound of things, you might be better off without the AC in that vehicle if that's what it comes to. AC systems are often more expensive than people expect to repair. Not to mention there are a lot of components to the system and you need specialized equipment, and sometimes a special license to work on it. For those reasons I don't recommend the DIY do AC work themselves. written by EricCG
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1 Answer

Engine seems to lack power w/ ac on . now engine will stall

Check the RPM if it drops when you have the AC on while the car is not moving. If it does drop you may want to check on the idle compensator. Its job is to bring increase RPM to make up for the added load. You may also want to check on the idle if it is below the normal speed. The added load may decrease the speed and send you to stall. If they all check out OK, you may want to check out the compressor as well if it gives the engine too much load. This can be caused by a faulty compressor or too much freon, or the bearing may be bad (with the bearing, you will get to hear a screeching or whinning sound).

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