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Jeep liberty heats sitting still go down road starts blowing…

Jeep liberty heats sitting...

Jeep liberty heats sitting still go down road starts blowing cold air

Mechanic's Assistant: Have you checked the coolant level? Have you checked for a leak in the radiator?

Yes

Mechanic's Assistant: What year is your Liberty?

2002

Mechanic's Assistant: Are you fixing your Liberty yourself? What have you tried so far?

Replaced radiator and themostat

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Answered in 5 minutes by:
11/21/2017
Dan
Dan, Technician
Category: Jeep
Satisfied Customers: 26,048
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Hello, my name is ***** ***** I'm here to help get your problem solved.

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What engine do you have? Were you having problem before replacing radiator and thermostat?

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Customer reply replied 9 months ago
3.7 yes

H​ave you tried to flush out the heater core?

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The heater core is a parallel tube design. It can be 3/4 plugged and still flow water through it. It can be nearly impossible to flush it clear.Flush the engine block before replacing the heater core but if that doesn't help then next step would be replacing the heater core. Only other thing that could cause this is headgasket failing cause air bubbles in coolant, you could do a block test to check for exhaust gas in coolant indicating head gasket leak but that would usually show other symptoms too. Let me know if you have questions, thanks.

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Customer reply replied 9 months ago
could it be water pump not circlulation jeep runs find no other problems just when you start down the road

It could but but pretty unlikely, the heater core is problem almost all of the time and I've never seen a water pump cause problem without also causing overheating problems. Let me know if you have more questions, thanks.

Dan
Dan, Technician
Category: Jeep
Satisfied Customers: 26,048
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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