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Re: 01 jeep grand chkee 4.7 hydraulic fan inop
Posted to Technical Discussion Forum on 2/10/2007

TSB 07-002-01 deals with a flash software update specifically for this condition.

There is a controlled minimum fan speed dictated purely by plumbing, so if it doesn't run at all you have a flow or pressure issue.

The solenoid is powered up by a relay and ... Login to read more.