PCM Controlling E-fan on 02 Chevy truck
May 3, 2012 | 10:43 PM
#21
I would like to know how you have your wired. The only way I've seen them wired is off the a/c clutch signal. +03 truck have this a/c pressure sensor wire-up to help control the fans when a/c on. I also know the 02 f-bodys control the fans the same way too. I be wire up the a/c pressire sensor this weekend so we will find out if it works.
May 3, 2012 | 11:06 PM
#22
99-02s have an A/C high pressure recirculation switch. It is an input to the PCM that when the high side pressure is above 325 psi makes the PCM turn the A/C system over to recirculate regardless of the selected setting.
This is what I've been using for the last year and its worked great. ]
This is what I've been using for the last year and its worked great. ]
May 4, 2012 | 06:50 AM
#23
TECH Resident
Joined: Dec 2006
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From: Enid, OK
Yes I have. When I first installed the fans the settings I used weren't right and it was cycling the fans on and off with the high pressure switch. I think I was using F body settings and I had to modify them to what I have now. By setting G0903 to 50 degrees it made it so that anytime it has an AC request signal and the engine coolant temp is above 50 degrees.
May 4, 2012 | 08:17 AM
#25
I would like to know how you have your wired. The only way I've seen them wired is off the a/c clutch signal. +03 truck have this a/c pressure sensor wire-up to help control the fans when a/c on. I also know the 02 f-bodys control the fans the same way too. I be wire up the a/c pressire sensor this weekend so we will find out if it works.
Im still trying to figure out what your doin? wiring in a AC pressure switch?
May 4, 2012 | 08:51 AM
#27
Lady3bglover
I had a Nelson efan wire harness for 2-1/2 year. There wire diagram shows the fans wired of the a/c clatch signal unless they changed over the years. This is not difficult I'm just tring to do something different.
I had a Nelson efan wire harness for 2-1/2 year. There wire diagram shows the fans wired of the a/c clatch signal unless they changed over the years. This is not difficult I'm just tring to do something different.
Last edited by 53RUSSELL; May 4, 2012 at 11:47 AM.
May 4, 2012 | 09:02 AM
#28
I have my fans wired the same way. For one I'm not wiring in a pressure switch. I'm wiring in pressure sensor. The pressure sensor will be able to read the high side pressure so i can turn the fans on at any psi when the a/c running.
Last edited by 53RUSSELL; May 4, 2012 at 11:48 AM.
May 4, 2012 | 08:38 PM
#29
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Joined: Dec 2006
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From: Enid, OK
It works, it just doesn't work right. The fans won't be controlled right for the AC unless you set G0903 to something low like 50 degrees. Otherwise you have fans that cycle on and off with the 325 psi high pressure switch. This is not the best thing for the longevity of the AC compressor let alone AC performance. Mine froze my frijoles off today and it felt damn good.