cooling fan runs constantly wont shut off until battery dead. in the past year i've had 3 ralay go out every time fan does not come on last time would not work changed relay fan runs constantly got another from dealer still runs constantly while trying to fix alternator quits (alt was good ) changed PCM fixed alt. but cooling fan still runs checked ETC sensor reads good im a decent wrench but cant figure this out
02 liberty cooling fan
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greg92jeepxj
Official Supporter
Welcome to jeeps.com . Don't know the Liberty well and don't have a wiring diagram for it but it really sounds like a short is causing the fan to stay on. The power to the harness connector must be traced back to the PDC ( power distributor center) . I doubt it is a problem at the climate control on the dash bit I won't say no either since I don't know that particular control and if a short can develop their either. The a/c cycles when on or in defrost and the electric fan(s) go on so maybe this needs to be considered. But start from the harness plug working back to the PDC. Expecting the short or problem to be there (maybe). Incidentally , the fan relays are hanged with the a/c clutch relay so look there as well . If a/c is off when fan running wild , look,for an alternate coolant sensor or fan switch besides the coolant temp,sensor . Something , somewhere is causing a short that is allowing power to the fan(s).
