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Old 06-12-2019, 01:55 PM   #41
Cusser's Avatar
Join Date: Aug 2016
Location: Hot Arizona
Posts: 408
Vehicle: 2004 Frontier
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I'm starting to experience an AC issue I'm exploring on my 1998 Frontier, 240K, AC is all-original except for a high pressure line replacement 2 years ago due to a pinhole developed on a 119F record day. This vehicle always had great AC even in Arizona summers. I have a dash light in this wired in parallel to the AC compressor, so I can visualize when there is voltage to the compressor (can't remember why I actually installed this light, but I had done same on my 1988 Mazda truck). Anyway, last couple of days I noticed that AC would blow very cold as I've always experienced, then would start coming in warmer, and this was at highway speeds; the dash light stayed on during all this, so my suspicion is that the AC clutch might be slipping or disengaging at times then re-engaging without me doing anything. I was using aftermarket cruise control during much of this that is vacuum-operated, but don't think anything AC-related on this utilizes engine vacuum. I have now put a thermometer into the vent and will get some actual numbers, and also try to pull over and quickly take a look-see when this happens again. I think that the issue will get worse though, and not like I'm uncomfortable in this, as it happened like 6 times during a 90 minute drive.

Last September, the AC compressor seized in my 2004 Frontier, and I installed a brand-new one; that Frontier has the same compressor, and I still have it and its working AC clutch if needed in the future. I don't know if these DKV14C compressors have a thin shim that can be removed or not. So I guess I'll just gather more data, and expect that as the issue occurs more often then it will be easier to troubleshoot.

Any ideas would be appreciated, thanks !!!
2004 Frontier King Cab (2WD, 5-speed, 4-cylinder, 98.5K), 1998 Frontier regular cab (2WD, 5-speed, 4-cylinder 225K), 1988 Mazda B2200 (2WD, 5-speed, 4-cylinder, 214K), 1971 VW Convertible (140K), 2005 Yukon (180K), 1970 VW (260+K)
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