Question about 2001 Isuzu Rodeo

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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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Posted on Jan 02, 2017

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1 Answer

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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THE DEFROST SETTING CALLS FORE THE AC COMPRESSOR TO ENGAGE TO DRY THE HUMIDITY. THE CAR IS STALLING PERHAPS BECAUSE OF THE LOAD PUT UPON THE ENGINE BY THE ENGAGEMENT OF THE AC COMPRESSOR. THE COMPRESSOR MAY BE LOCKED UP

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When your AC comes on, the engine automaticly increases your idle so the car won't stall from the added horsepower requirement from running the AC compressor. It's normal.

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1 Answer

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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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if the compressor was locked up the drive belt would come of when u engage the AC compressor, your problem is most likely a low charge

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