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Re: 2002 jeep grande cherokee check engine light
A common problem on many of the new cars is that when a person gets
gas, they don't tighten up the gas cap. This will turn on the check
engine light. Did you get gas recently? Another option is to see what
code is stored in the ECU that turned the light on. This is done with a
scanner tool. If you do not have a scanner, then have a dealer look at
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Does it overheat? Which engine does your jeep have? If it has the 4.0, then it has an electrical cooling fan and the control relay most of the times fries. Its hidden under the bumper cover under the right hand headlight (seen from drivers position). Many time this relay fries due to the fan which is drawing too much current.
If your jeep has the 4.7, then it has a hydraulic cooling fan. That fan always idles (300 rpm) when the engine runs and will ramp up when the engine temperature gets too high. There is a control solenoid for this fan, but when its bad, then you should have the check engine light. Check for fault codes using the key dance: ignition switch off/run three times and leave in run at the third time. The odometer will show "DONE" when all ok, or any fault code(s).
Fan relay is located under pass headlight. Remove light assembly, use 2 1/2 " hole saw to drill hole in plastic housing ,3"from back wall, 3'' from left side.This will put you right over relay. Unscrew two bolts,replace. Relay was $40.... dealer wanted$350 to remove front bumper to replace it.
You say you changed the fan relay and the thermostat? when was the last time you had the cooling system flushed? you could have a blockage in your cooling system that could be keeping the coolant from circulating..
Relay is in the power distribution center near the battery. does the fan go off when you remove the relay? Relay is turned on by the computer after it receives info from the temp sensor. Why didn't the "guy" order a new relay? Was he a tech in a shop?
the only problem that vehicle has is with cooling fans is relay/module or electrical harness to module that burns up located behind and under right front headlamp assy must remove headlamp to access relay/module that is what powers up fan motor module assy.