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2005 Chevrolet Avalanche Engine cooling fan

Tiny
MBHENRY
  • MEMBER
  • 2005 CHEVROLET AVALANCHE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
My A/C started cycling warm and cold air. I put gauges on the system and they are reading normal in the A/c Auto position. But when I raised the RPM's to about 1500 I noticed that the Hi pressure got to about 300 psi.
But I noticed that the engine cooling fan did not come on with the A/C.
Once the engine temp called for the engine fan to come on the high pressure came down and the temp out of the vents cooled down.
I have no schematics, so where do I look for the relay/fuse/switch that turns on the fan when the A/C compressor comes on?
Thanks
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Wednesday, August 27th, 2014 AT 4:56 AM

4 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Fuses and relay are under hood for the fan. Also pull havc fuse inside truck your temp actuators may need to reset or they are going bad.
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Wednesday, August 27th, 2014 AT 6:16 AM
Tiny
MBHENRY
  • MEMBER
  • 6 POSTS
I will ck the hvac fuses and relays, but how do I reset the actuators?
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Wednesday, August 27th, 2014 AT 6:39 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I forgot to put that in lol. Pull hvac fuse for 60 seconds with key on then reinstall. They will reset sometimes but not all the time. Sorry.
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Wednesday, August 27th, 2014 AT 7:17 AM
Tiny
MBHENRY
  • MEMBER
  • 6 POSTS
LOL.
Thanks
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Wednesday, August 27th, 2014 AT 8:27 AM

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