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Unread 03-23-2013, 07:04 PM   #1
suey3b
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2001  
 
Join Date: Feb 2013
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Laredo overheating - please help

My son has a 2001 Jeep GC Laredo. It started to overhear about a month ago, and we've changed out the thermostat, relay and burned out radiator fan motor, along with the fuse. Nothing has worked. Today we checked that the relay and fan were pulling the correct amperage and were grounded - everything checked out ok. My father in law says it might be the PCM. Which is going to su*k if we have to replace that. How can I check to see if the PCM is bad? Thank you!!

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Unread 03-23-2013, 07:09 PM   #2
RTLee
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Location: St. Joseph, Michigan
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Is the fan not turning on?

Is the cooling system free of leaks? Can you feel heat from both upper and lower rad hoses? Has it previously overheated badly? (if so you may have to block test it for combustion gasses in the cooling system, if this is positive, you have a blown head gasket.)

More info, please!
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Unread 03-23-2013, 07:17 PM   #3
suey3b
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The fan is not turning on at all, but does when you jump it right from the battery. Checked the amps that it's pulling and it seems to be fine. Relay clicks on and off. Fan does not turn on. It has overheated to the point where it was boiling. As long as he's moving, it's ok. But when it's idling, it overheats.
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Unread 03-23-2013, 07:18 PM   #4
suey3b
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No leaks in cooling system and it has heat in both hoses.
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Unread 03-23-2013, 07:25 PM   #5
RTLee
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Was the relay behind the headlight changed as well?

You can check the PCM by activating the fan through a scan tool.
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Unread 03-23-2013, 07:44 PM   #6
suey3b
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Yes, we changed the relay behind the headlight. Someone had apparently done so in the past, as there was already an access hole cut in the plastic.
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Unread 03-23-2013, 07:48 PM   #7
RTLee
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Location: St. Joseph, Michigan
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It doesn't make sense. At all. The relay is putting out the correct amperage yet isn't turning on? Wiring? Are you actually getting voltage and amperage at the plug ON THE FAN? If so it should turn on...

Real head scratcher here...might be worth getting a shop involved. It's worth it to stop throwing money at the issue.
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Unread 03-23-2013, 08:00 PM   #8
suey3b
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We checked to see how much amperage the fan was pulling, but now that you mention it, I'm not sure we checked the wires from the relay to the fan connector. I really appreciate the comments and suggestions. I think we're probably going to take it to the shop this week. Thank you.
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