fan problem help!
09-22-08, 08:09 AM
#1
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fan problem help!
hey I have a problem I can't figure out my fans are not coming on causeing my car temperature to go up I checked the fuse under the hood and it was fine I recently replaced it and it was working now they just don't come on. Could the thermostat have anything to do with it? Any suggestions will help. Thanks
09-22-08, 12:42 PM
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ya but last night they didn't come on and my lights were on. The only fuse is the one under the hood right? I'm just frustrated with my car I like driving it a lot. But would the thermostat have anything to do with it?
09-22-08, 12:55 PM
#7
When the relays come on:
* Relays 2 & 4 controlled by PCME, come on when temp reaches 221F.
* Relay 3 controlled by thermoswitch, comes on at 226F
* Relay 1 controlled by A/C switch.
How fan speed affected by relays:
* Off, none on
* Low speed comes on when relays 2 & 4 are active.
* Med speed comes on when 2 & 4 are on plus _either_ 3 or 1 comes on but not both
* High speed comes on when all are on.
Other facts:
* The fan controller can bypass the 226 thermoswitch and fake out the relays 2 & 4.
* Grounding the test lead _immediately_ turns on relay 3.
* When you ground the test lead then the fan controller waits 2 min and turns on 2 & 4.
* If the test lead grounded for 2 minutes before engine shutoff, relays 2,3,4 will be kept on.
* Relays 2 & 4 controlled by PCME, come on when temp reaches 221F.
* Relay 3 controlled by thermoswitch, comes on at 226F
* Relay 1 controlled by A/C switch.
How fan speed affected by relays:
* Off, none on
* Low speed comes on when relays 2 & 4 are active.
* Med speed comes on when 2 & 4 are on plus _either_ 3 or 1 comes on but not both
* High speed comes on when all are on.
Other facts:
* The fan controller can bypass the 226 thermoswitch and fake out the relays 2 & 4.
* Grounding the test lead _immediately_ turns on relay 3.
* When you ground the test lead then the fan controller waits 2 min and turns on 2 & 4.
* If the test lead grounded for 2 minutes before engine shutoff, relays 2,3,4 will be kept on.
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09-22-08, 02:52 PM
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Wait a minute....you said you replaced the 60A fuse for the fans recently? Is that because it was blown? If so, then you likely have a short somewhere which is causing all your problems....kinda hard to diagnose via the internet.
09-23-08, 03:32 PM
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yes the fuse blew and I fixed it I'm going to run a few basic checks to see if it's a short does anyone know if there's a relay that also controls the fans besides that main fuse?
09-23-08, 05:56 PM
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ok my fans work but only when i have the a/c compressor engaged and it dramatically drops my temp so it was definetly the fans. my temp is back to normal at 80-85 c even when im running it hard its kind of hard to believe how good my temperature is. does anyone know why it only works with the compressor on?
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