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We have replaced virtually all of the parts of the cooling system (radiator, thermostat, fan switch, fan relay, temp sending unit) as well as the head gasket. We are not throwing parts at the car. All of these needed to be replaced. But after replacing the head gasket, our mechanic found the car overheating, apparently because the radiator fan does not kick on at the appropriate temperature. I have never found a blown fuse indicating a bad fan motor. Any suggestions as to how to diagnose further? As I said, the problem is intermittent. At times, the fan kicks on properly and the car runs fine without overheating. Then other times it won’t. As far as I know, both fans always run when the AC is on.
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How, exactly, are you observing this? Are you using the dash temp gauge? How do you know when the fan is kicking on or not?
Hello 🙂
You know fan work when ac is turn on.. And you have New fan switch..
Diagram here show Control of fan. You could try take Connector of fan switch and jump terminals. ign on, and see if fan starts..
If they run, you could check if fan switch Close at approx 199F. If all that ok, you have maybe air Pocket in system or maybe bad waterpump..
Ad if they dont run when jump betwen terminals, you have an open in G101 To fan switch, or , fan switch to splice (That splice that goes too ECM) Becouse when ac is turned on ECM ground Control thru there too fan relays..
Hope you understand my bad English 🙂
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