cold morning warm up turns into overheat
#1
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Model: Cherokee
cold morning warm up turns into overheat
Woke up to 1 degree this morning and started the jeep/ 96 xj. 4.0/ wanted to let it warm up before I took off to work. About 10 minutes later I went out and got in. The heater was blowing cold air and then I noticed it was overheating. Turned it off emmediatly and took the wides car. Any idea what could have happened?
#4
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Yep, heater blowing cold and overheating....something is not flowing properly
(Just thinking along here, not that I've ever had that issue here in Oz, hehe.)
(Just thinking along here, not that I've ever had that issue here in Oz, hehe.)
Last edited by Roler; 01-07-2014 at 12:14 PM.
#5
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
That's why I told him to check coolant strength first. Or lack of strength.
The first thing everyone wants to do is jump in there and replace the poor thermostat. I wonder how many good thermostats have been thrown away?
His antifreeze is likely the problem.
The first thing everyone wants to do is jump in there and replace the poor thermostat. I wonder how many good thermostats have been thrown away?
His antifreeze is likely the problem.
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#8
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I'm not sure about the anti freeze strength. But I'm going to say very weak. She's. Parked in the garage with a heater on the radiator now. Hopefully going to thaw it out and do a flush and fill to see if it helps. Is draining the fluid from the block recommended?
#11
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Heater core is drained by removing the heater hoses of the thermostat. Take the opportunity to flush the heatercore while you're at it (reverse flush, so flush opposite direction of how it ususally flows, to flush the crud out the heatercore.
Block has drain'plug' on the side, but not sure if this is depending on year (and model).
Somebody will likely chime in regarding this.
Block has drain'plug' on the side, but not sure if this is depending on year (and model).
Somebody will likely chime in regarding this.
#12
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Well I was unable to find the block drain plug and I couldn't flush the heater core because my garden hose was frozen. The problem was a frozen radiator. I drained it and flushed with hot water. Then filled with 50/50. Not the best flush but it gets me back on the road and I have heat. Hate I couldn't do a full flush but its surely better than nothing. Id still like to redo it and find the block drain so if anyone knows exactly what it looks like on a 96. 4.0 let me know.
#13
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Year: 1999
Model: Cherokee
Engine: 4.0
Well I was unable to find the block drain plug and I couldn't flush the heater core because my garden hose was frozen. The problem was a frozen radiator. I drained it and flushed with hot water. Then filled with 50/50. Not the best flush but it gets me back on the road and I have heat. Hate I couldn't do a full flush but its surely better than nothing. Id still like to redo it and find the block drain so if anyone knows exactly what it looks like on a 96. 4.0 let me know.
The drain plug is on the left side of the engine near the rear, and above the oil pan. The plug takes a special size square drive. They've been reported as being available at Harbor Freight as a set but I went to my Harbor Freight and couldn't find them. Go on line and see if they're listed.
Last edited by CCKen; 01-07-2014 at 07:27 PM.
#14
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Year: 1990
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Aside from the coolant issue, I had my thermostat lock up on me one time in the bitter cold -26 a good rap with a screwdriver on the stat housing opened it. Just another thing to look for in the "hard" winter.