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Recurring problem with A/C or engine.

 
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  #31 (permalink)  
Old 09 Oct 2018, 06:28 pm
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Default Re: Recurring problem with A/C or engine.

Doesn't the IAC add a few rpm's at idle when the A/C is turned on?
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Old 09 Oct 2018, 09:15 pm
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Default Re: Recurring problem with A/C or engine.

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Originally Posted by rckstein View Post
Doesn't the IAC add a few rpm's at idle when the A/C is turned on?
On my silver Pt Cruiser it maintains the same rpm's. If the IAC was not working you would see a drop in rpm's when you turn on the A/C.
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Old 09 Oct 2018, 09:43 pm
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Default Re: Recurring problem with A/C or engine.

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Originally Posted by ptcruisersteve View Post
On my silver Pt Cruiser it maintains the same rpm's. If the IAC was not working you would see a drop in rpm's when you turn on the A/C.
That's what I mean, maybe the IAC on his PT isn't working correctly, and when he turns on the A/C, that's what causes the RPM's to dip so low?

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Originally Posted by Rumble View Post
No, it doesn't seem to increase any when A/C is engaged. Maybe I need to disconnect the battery and see if that will reset things?
This is from the Service Manual:



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Last edited by rckstein; 09 Oct 2018 at 09:54 pm.
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Old 10 Oct 2018, 09:20 am
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Default Re: Recurring problem with A/C or engine.

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Originally Posted by rckstein View Post
That's what I mean, maybe the IAC on his PT isn't working correctly, and when he turns on the A/C, that's what causes the RPM's to dip so low?



This is from the Service Manual:



The A/C needs to be checked to make sure it is working properly before looking at the IAC. If you are low on freon, compressor is not working properly, etc. it might also effect the rpm.
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Old 10 Oct 2018, 03:41 pm
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Default Re: Recurring problem with A/C or engine.

Would a faulty IAC show a code? Oddly enough, I replaced an idle air module on my truck (92 Chev) a few months ago.
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