Question about 2003 Jeep Grand Cherokee
You didn't include enough info to really help but most times overheating is caused by low coolant level from an external leak, a failed or failing thermostat, a bad radiator fan (electric or clutch type) or fan relay, coolant sensor etc. Any obstruction to air flow through the radiator or internal obstruction can also cause an overheat. Last but not least, either too much water or coolant can lower the boiling point. Make sure you have a 50/50 mix and a good pressure cap of the correct pound rating. (I think yours is rated at 16-19psi)
If you see white smoke from the tailpipe even after warm up, you may have a blown head gasket. In that case you'd need to take care of that but should also find the initial cause (any of the above).
When doing any testing be very careful...opening a system even when not in overheat can cause hot antifreeze to come out quickly and with force. (can make for very bad burns)
If you narrow down the problem a bit and need more specific info, just ask.
Posted on Jul 15, 2010
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Posted on Jan 02, 2017
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