My spal fans are turning on at 208 and off at 199. Yes I read the vortex site. Last time this happened I replace the fan switch and that fixed it. So I replaced the switch again and no change. It appears GM discontinued the old switch and the new one has a higher turn on/off temp. My question is does the extender chip determine the fan turn on/off temp? My extender doesn't seem to control the fan. Thanks.
Fan turn on temperature
- Thread starter GNRick
- Start date
OK something failed after going wot last week. The fans are spliced together so they come on and off together. Oreilly's website says turn on temp for their switch is 212 degrees. Sounds like my chip never controlled the fans and I always relied on the switch.
Mike Licht said the default turn on temp for extender is 175 and turn off is 170. With a 185 stat my car will never see 170 so the fans would theoretically never shut off. However I know my fans used to come on and off so this makes no sense to me unless my fans were controlled by the now discontinued fan switch.
If your fans were wired properly, they should have hot wired relays of their own that are powered by the stock fan control harness. They should never be powered directly by the stock harness, it can't handle that kind of current draw.
- Joined
- Feb 18, 2006
Sound like you may have lost the signal from the ecm.
I would make a jumper wire and see if you can toggle the fan from the relay plug.
I would make a jumper wire and see if you can toggle the fan from the relay plug.
- Joined
- Feb 18, 2006
You would ground D2 at the ecm. Key has to be on.
Call me if you need more info
Rick
Call me if you need more info
Rick
On the low speed fan relay ground the dark green wire. This should make the fan come on. If it does everything from the relay to the fan is working. That would mean the ECM is not sending the ground to the relay or there is a problem in the wiring from the ECM to the relay.
- Joined
- Feb 18, 2006
Key has the be on for above method as well.
