Duramax Diesels Forum Truck of the Week
Old 09-11-2019, 06:19 PM
celo1216 celo1216 is offline
Join Date: Sep 2019
Posts: 1
Default AC on and off

I have an 08 Duramax. This summer the ac started to kick on and off at idle. Mechanic says it is the Intercooler and that it’s not gettting good airflow. My pressures are too high. Some things that have been replace in the last few months is the injectors, new turbo, radiator, condenser. Everything I’ve read about the Intercooler does not mention how it effects the ac. Any suggestions. Or feedback?
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Old 09-11-2019, 06:51 PM
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gmduramax gmduramax is offline
Shits broke
Join Date: Jun 2008
Location: Nor cal
Posts: 3,502


If it is dirty it will restrict air flow over the stack. Pull it out and clean it.
2008 GMC duramax crew cab short bed 2500.
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Old 09-11-2019, 08:40 PM
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hondarider552 hondarider552 is offline
Getting faster

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Location: Arizona
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Considering the AC condenser is in front of the intercooler... Not sure I'd believe your mechanic haha...

04 SC/SB 1500 Dart 427ci, AFR 6 bolt heads, twin 80mm turbos, TH400 [email protected] so far..
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15 Cruze diesel deleted by Fleece

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Old 09-11-2019, 10:41 PM
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JoshH JoshH is offline
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I don’t see many plugged up intercoolers restricting air flow through the cooling stack. Usually the stuff builds up on the radiator. I would check to make sure the new radiator doesn’t have stuff piled up in front of it. If it looks clean, I would suspect a faulty fan clutch.
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06 Express 2500 Duramax Van "The Dumpster"

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Old 09-12-2019, 03:28 PM
Ron Nielson Ron Nielson is offline
Join Date: Oct 2009
Location: Berryton, KS
Posts: 153

In order, front to back is:
Trans Cooler
A/C Condenser

I don't think the Intercooler could have any likely effect on the performance of the A/C Condenser. If the Intercooler was really plugged, you would have other much more noticeable issues, i.e. high coolant temps, high oil temps, etc.
Ron Nielson

2008 Chevy Silverado LT, SRW, Crew Cab, LB, LMM/Allison, Rear lowered 2": otherwise, fully stock at this point. Edge Insight CTS
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