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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Wed, 15 Apr 2009 05:33:19 Share Post by Email
In Reply to: colling troubles, Dave, Tue, 14 Apr 2009 20:56:19
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If you can short the leads of the thermoswitch together and the fan comes on, then the fan and relay are OK. There should be a high and low speed switches - Black is the common wire, blue is the low speed fan, and blue/white bypasses the resistor and the fan runs at high speed.

First - when do you expect the fan to come on? It should come on only after the car has warmed up, and the car isn't moving (and the engine running). If you take the car for a drive, and then just sit in the driveway, idling, does the temperature gauge just keep climbing until it hits the red? (and the fan doesn't come on).

When you're driving around, where is the temperature gauge?

Assuming the fan never comes on when you sit idling, but the temp gauge is OK when driving around, then-

If bypassing the switch causes the fan to come on, the fan and relays are OK. If you've replaced the switch, then it is either another bad switch (it can happen), or the switch isn't getting hot enough. It wouldn't get hot enough if there is a blockage in the radiator. Now, that should show up as the temp gauge running hot even when driving around, because the cooling system is compromised.

It would be helpful if you gave some details on when the fan isn't coming on when you expect it to, and how the temperature gauge behaves when idling and when driving around.

posted by 192.249....

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