Question about 2002 Jeep Wrangler

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Tried all the solutions posted about my 2002 jeep wrangler 4.0 liter over heating.Nothing has worked. How do you check to see if water pump is working,it looks to me like the coolant is not moving

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  • kjbd Mar 08, 2009

    i repaced thermostate[ in the right direction] also replaced radiator and coolant 50/50 still have no heat and coolant gets pushed into resavior tank when running .Temp goes in red zone when driving.when i turn off engine coolant ruturns to radiator, but radiator is steaming I feel water pump is not working. How do you know .Also I have burp the system in many ways please help

  • Mike Butler
    Mike Butler May 11, 2010

    One way is to take rad cap off & observe the flow when engine reaches normal operating temperature where thermostat should be opening. When thermostat opens, coolant should flow into rad fairly good, then shortly after, the rad fan should come on. Having not read the other postings, I have to ask, what was original problem (i take it was overheating) when was it doing it, and what exactly have you tried so far?



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If you haven't aleady, I'd replace the rad cap too.As far as the flow goes, It's usually easy to see big flow increase in rad when thermostat opens at about 190F-210F. If your not seeing an increased flow when gauge at normal operating temperature, then yes, water pump would be next. With that said, a compression or cooling system pressure test may be needed to rule out head gasket too. Does it appear to be losing/using coolant or just heating up? If it is losing coolant, then headgasket may be the problem. Let's hope that confirming good flow or no flow in rad, by visual, will answer your question.

Posted on Mar 08, 2009


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