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    illinois1's Avatar
    illinois1 Posts: 92, Reputation: 2
    Junior Member
    		  
    #1

    Jun 15, 2010, 05:39 AM
    Is relay bad for radaitor fan on a 1997 Ply. Grand Voyagar 6 cylinder 3.3?
    If I jump the engine coolant temperature sensor by pulling the harness and putting a wire to connect the two leads the fan should go on?

    If not,I'll try by passing the relay.Would it be done like this pull the harness to the relay Ground the ground wire and jump the dark green wire(relay)to the gray(hot) with a jumper wire with a 10 amp fuse in the jumper wire?

    I have power to the relay! I put a meter on the lead in for the PCM on the relay and got a resistance of 2000 OHM. There is no continuity for the cooling fans lead!

    I know these relays are known to go bad and it is not common for the PCM to have a problem with out the service engine light coming on in a situation like this?

    If this is correct I should be able to replace the relay with one that is functioning and the car will not over heat any more because the system is working correctly?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Jun 15, 2010, 06:15 AM

    Hopefully, you mean ECT Switch, not ECT Sensor. These links may help:

    https://www.askmehelpdesk.com/cars-t...ml#post1642158

    https://www.askmehelpdesk.com/cars-t...tml#post235973
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #3

    Jun 15, 2010, 08:25 AM
    Quote Originally Posted by illinois1 View Post
    If not,I'll try by passing the relay.Would it be done like this pull the harness to the relay Ground the ground wire and jump the dark green wire(relay)to the gray(hot) with a jumper wire with a 10 amp fuse in the jumper wire?
    That should work but make certain you use a fused jumper. That's a 40 amp circuit. 10 might not be enough.
    If this is correct I should be able to replace the relay with one that is functioning and the car will not over heat any more because the system is working correctly?
    It may work, if that's the only problem causing the overheating.
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