Why doesn't my A/C or cooling fans work - LS1TECH



LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Why doesn't my A/C or cooling fans work

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Old 04-18-2012, 08:51 PM   #1
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Default Why doesn't my A/C or cooling fans work

Hello, ive got a 96 z28 auto. My coolant fans do not come on, not even with a/c or ses light on. Also my a/c doesnt come on. Im sure the problems with the fans are from the coolant temp sensor because I unplugged it and the came on. All my relays are good but when I jump the 30-87 leads on the fuse box I can get my fans and a/c to turn on. My question is after I replace the temp sensor to get my fans working what do I do to make the a/c compressor kick on. Alot of you have had a bad temp sensor but you turn on the a/c to get the fans going but my a/c doesnt kick on at all unless I jump the relay
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Old 04-18-2012, 09:40 PM   #2
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does your ac have and refrigerant in it? too little or too much pressure can cause it not to engage... also see if the I think two or three pigtails/sensors associated with the hvac are plugged in and working. (should be temp, pressure, and compressor)

for your fan problems, if you want them to turn on manually www.shbox.com has a writeup of how to wire in a switch to turn them on as needed.
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Old 04-18-2012, 11:57 PM   #3
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Just recharged the a/c with some r-134 from the local parts store, and everything else seems to be plugged in.
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Old 04-19-2012, 01:07 AM   #4
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It will be empty in t minus a week or so guarantee the compressor and or suction discharge hose assembly is puking refrigerant as this is being typed.
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Old 04-19-2012, 08:00 AM   #5
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What was the hi and low pressure when you added freon?
Only way to test coolant sensor is to monitor with a scanner or to ohm the sensor terminal.
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Old 04-19-2012, 12:27 PM   #6
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I had the same cooling fans issue, a month ago.

I went to "speed inc" in google. Went to their website, and bought their "HI-LO fan switch" What it does is lets your fans run normally, or manually turn on Low, or High fans without sending an error code.
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Old 04-19-2012, 03:29 PM   #7
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You may have already but check the fuse and relay. I had the same problem and finally checked the fuse after 2 days of troubleshooting and it was the problem.
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96, ac, compressor, coolant, cooling, doesnt, fan, light, low, ls1tech, lt1, plugged, work, works, z28

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