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Re: k2500 with Manual A/C
The service manual specifically states the recirc door is enable with head pressure greaterthan 350 psi--
It is a manual system that automatically goes into recirc- and probably does not turn recirc light on. C/K trucks have been doing this since late 80's- popping into recirc mode when they experience high head pressure on highest and next to highest fan speed, and coolest temp setting- I have experienced this complaint for 20 years- folks just like you telling me the fan goes into high high fan all by itself- for no reason-- and they have manual a/c systems-- please read your service manual if you have difficulty believing what I am telling you- I would cut and paste it for you- but Mitchell on demand is copyrighted and I respect their position.....
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Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
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