Question about 1993 Jeep Grand Cherokee

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Blower motor starts and stops

Blower motor will go on for a minute and then stop. It starts about 10 minutes later and stops. I already replaced blower motor and blower resistor board. Same problem. Please help.

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  • ducoti1 Dec 06, 2008

    Hi I have a similar problem with my 96 s10 blazer. The blower motor only runs in high speed and that's ok with me, but since I got this S10 the blower will run then shut off and a little while or a long whil wil start up again. As I am not a mechanic Once when it was not blowing I used a wrench and tapped on the relay closest to the blower moter and it started up. Once when I turned off the engine the blower kept running and I again tapped it and it shut off the blower motor. Should I replace that relay and on another note, ther is a cluster of three relays there, are they all the same?

    Thanks

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It sounds to me like an 'intermittently open circuit', or in plain language, when some part of the heater's circuit heats up a connection somewhere in the circuit 'opens up' stopping the flow of electricity. Then (10 minutes later?) when the circuit cools again the connection 'closes' again until warm. I would trace all the wires in that circuit from the fuse box to the blower motor (including fuse box & fuse) and look for broken or cracked insulation; make sure all connections are tight; I'd certainly check the heater's 'setting' switch (off,high, low switch) on the dash. It could also be a fusible link. This is a piece of wire somewhere in the circuit that 'feels' different than the other wire, more 'rubbery' and not as stiff. It's actually a little thinner wire inside than the rest of the circuit made to burn cleanly through (acting as a type of fuse) rather than over heating the circuit itself The problem has to be in this circuit, and something that 'opens' when heated. Good luck!

Posted on Nov 24, 2008

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