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ARFFAZ

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    David Diego

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  1. You were on the right track. My system was full but I ended vacuuming down the system and filling it back up to spec and still had a problem. The AC pressure switch/AC pressure transducer was being grounded out through the rack and pinion.
  2. http://www.gm-trucks.com/forums/topic/202155-help-solve-this-ac-mystery/page-2?do=findComment&comment=2010360 Problem solved... see post above.
  3. Pull your HVAC/ECAS fuse in the engine compartment fuse block or disconnect battery for a few minutes. This will reset your HVAC system.
  4. What would be the easy way to check for the ac pressure sensor failing? I have a cheap A/C pressure gauge, don't know if i would trust it to tell me the system pressure.
  5. Also my truck has NOT displayed a check engine light yet.
  6. AC in the off position. I even pulled the AC fuse and Relay and the fan still ran. This morning when I left for work (40 Deg outside) the fan turned on and the truck has been sitting for 2 days.
  7. My 07 1500 Classic 4.8 radiator cooling fans have been constantly running on high speed. When I start my truck and put the truck in drive the radiator cooling fans will kick into high speed after about 30 secs or so and will run at high speed until I turn the truck off or let the truck idle for a minute or so. I have replaced the coolant sensor - no luck Pulled the PCM and checked the pin - clean Quick tested the fan relays (no meter available) - Relays click over Besides testing the relays for continuity I am at a loss. Does anyone have an idea of what the problem might be? Thank you in advance!
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