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#1
07-14-2019, 12:56 PM
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1998 K1500 Air Conditioning is intermittent
A/C sometimes blows cold and sometimes blows hot. Any suggestions what to check or troubleshoot to figure out why?
I drive it with AC on and cold, after it sits a while and then next time I start it might blow only hot air. 1998 K1500 pickup , 5.7L 
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#2
07-14-2019, 02:37 PM
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Re: 1998 K1500 Air Conditioning is intermittent
Failed temperature control air-door actuator?
Failing compressor clutch? Failing pressure switch? Failing dash control unit? When this was my Trailblazer, it was the compressor clutch.
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. . For the good of the Free World, DEMAND COMPENSATION FROM CHINA for their release of the Virus Originating in the Wuhan Laboratory, released (intentionally or negligently) into the world in 2019 (VOWL-19). Ten trillion to start with, increasing as needed from there, PLUS compensation for the sickened, and "wrongful death" settlements for the families of those who didn't survive. END trade with Communist China.
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#3
07-15-2019, 09:11 AM
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Re: 1998 K1500 Air Conditioning is intermittent
Next time it is hot when supposed to be cold, pull over, pop hood, look and see if front of compressor is turning....probably not, then try to bump it somehow, either by slamming hood shut, or even use a rubber hammer- tap on front of compressor, if clutch engages, then you know you have a "too wide air gap issue" and the clutch driver need to be reset to about .020" gap. Very common issue.
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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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#4
07-16-2019, 07:33 PM
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Re: 1998 K1500 Air Conditioning is intermittent
Thanks, it'll be near 100F here for a few days so hope to see if it's the "too wide air gap issue" .
I've not heard of this. Can you provide a link to any reading on how to adjust.
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