2004 Jeep Grand Cherokee---Overheating after water pump replacement! Thoughts? - JeepForum.com
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post #1 of 3 Old 07-04-2010, 08:37 PM Thread Starter
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Join Date: Aug 2007
Location: Shakopee, MN
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2004 Jeep Grand Cherokee---Overheating after water pump replacement! Thoughts?

Happy 4th of July!

2004 Jeep Grand Cherokee 4.0L

1 month ago-Tires Plus replaced radiator that had a hole in it.

Yesterday-Replaced Water Pump due to weep hole leaking pretty good. Replaced belt while I was at it.

I was driving the car to open up the thermostat to see if the coolant level would drop (to add more) and get rid of any air bubbles. Drove on freeway for 2 miles. Temp got to around 200-210. Came to off ramp and car stalled at stop light. I started it back up and drove it 1/10 mile to the gas station. At the gas station, the temp gauge was working it's way up and it stalled again. Also, I noticed steam (or smoke?) coming from the top of the engine where you put oil in. I took the oil cap off and it was HOT with steam coming out of it (not too much).

I have put about 2 gallons of 50/50 mix into the reservoir and the first gallon was gobbled up right away (prior to the stalling issue) and then at the gas station, I put about .75 gallons of water into the reservoir and at last check, it had dropped down from over the line to just above the "fill line".

Temp slowly went back down and drove it across the parking lot and it is sitting at the local Goodyear dealership. Checked oil and it looked brand new (since it had been replaced 2 weeks ago).

Do you think I just had an air bubble in my coolant system?
Did the thermostat go bad?
Did I mess something up with the replacement of the water pump?

Please help! If you need more info, please let me know!

Thank you,

Hundoracer is offline  
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post #2 of 3 Old 07-04-2010, 09:16 PM Thread Starter
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Checked the coolant level and it was solid after 2 hours of sitting in the parking lot. Took the cap off the radiator and ran the engine too purge any air pockets.

Temp went to normal operating temps (below 210). But I didn't want to test it by driving it back home. She can rest at the shop's parking lot!
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post #3 of 3 Old 07-05-2010, 03:22 PM
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one thing I have seen in shops I've worked in about the 4.0 water pump- You have to be sure the correct one is being installed. Ealier years has a regular V-belt. Those pumps will fit your 4.0 serpentine belted motor but will spin in the opposite direction causing overheating. The store should be able to re-check the part number. Also I usually bleed air from these while filling the cooling system by pulling the heater hose slightly off the thermostat housing. When coolant comes out there, reinstall it.

96 GC Limited V8 245,000 miles Scrapped
04 GC Limited 4.0 264,000 miles
96 GC 4.0 175,000
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