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Re: cooling fan switch Posted by JimBlake [Email] ![]() ![]() ![]() In Reply to: Re: cooling fan switch, Adam ![]() |
Quick check... If you jumper the switch the fan should run. This means the relay & the rest of the fan circuit is OK.
Next, try suffering for a bit & drive traffic or idle without AC. The temperature should climb to maybe 2/3(?) then the fan should come on. If it keeps climbing switch on AC to run the fans before the gauge gets into the red. If you feel like it, remove the AC belt, so the AC switch becomes just a fan switch for this test. If the fan brings the temperature right down then I suppose its a bad fan switch.
One possibility is if the upper tubes of the radiator are blocked, then all the hot water goes thru the lower half of the radiator. The fan switch never sees the hot water, so it doesn't turn on. This is not a faulty switch, its a bad radiator. The proper way to check this is by measuring temperature at different positions up & down the LH tank on the radiator.
If the temperature stays down without the fan even at 10 or 20 mph, I don't think the radiator is bad.
You don't really have to drain the coolant to change the switch. Be ready with the new one, put your thumb over the hole, & you won't loose too much coolant. (Let the system cool off first ;o)
Check it out & let us know.
Jim
posted by 131.184.14...
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