Jeep Grand Cherokee Overheating

10

Asked by Nov 13, 2016 at 10:48 PM about the 2001 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

I have a 2001 Jeep Grand Cherokee, and it
over heats when I drive, but not at idle. I
have notice when it's overheating that the
top hose is extremely pressurized.  But the
weird thing is that I don't have a
thermostat in. Further information, I have
replace the water pump, radiator, radiator
cap. Also, when I bleed the truck, I bleed it
on a hill, the truck is blowing both cold and
hot air. I can idle and rev the truck as much
as I want without overheating, but as soon
as I drive about 2 miles it's goes very hot,
on the verge of overheating.
Is there any thought of the issue and
resolutions??

17 Answers

116,115

Are the cooling fans pulling and not pushing air through the radiators?

2 people found this helpful.
10

Well, on these jeeps, there are electric fans. And I forgot to mention that the fan does work.

1 people found this helpful.
116,115

They will work both directions, so make sure they are pulling air through the radiator, not pushing air out.

1 people found this helpful.
Best Answer Mark helpful
10

That seems logical, I'll check in the morning. If that's the problem, how do I resolute that? Also, what is your theorie on the high pressures top hose?

116,115

To change the fans direction just reverse polarity at the connector. High pressure can be a couple of things, 1 the coolant flow is too fast for proper heat exchange, a thermostat would slow down the flow, 2 air and coolant flow restricted, but you stated that you have already replaced both the radiator and water pump, so I think we can rule that one out, 3 a blown head gasket, compression gasses building up in the cooling system while running.

1 people found this helpful.
10

Alright, I'll look into the fan. If I had a blown head gasket, wouldn't the oil be milky? The oil is not milky at all.

116,115

In the very early stages the oil would still look good, but you might notice some coolant consumption.

1 people found this helpful.
10

This problem has actually been percostant for about 3-4 months. And I have not changed the oil since.

116,115

Ok if it has been that long chance are good that you don't have a blown headgasket, but if it keep getting hot like that it will.

1 people found this helpful.
10

Yeah, I am surprised it hasn't yet haha. But I'll get back to you when I check it. Thank you Shoe

116,115

Great and good luck.

1 people found this helpful.
15

Sometimes on these jeeps you can have a blown head gasket and not have a milky oil or oily antifreeze. Have a smoke test performed, it could be a hairline crack between cylinders

1 people found this helpful.
10

Yeah I saw that, but the problem is fixed. It was the fan, it was pushing the opposite direction and now it's. It overheating.. thank you so much TennisShoe. I would have never thought of the fan. I might have tore the whole head off before I looked into the fan.

109,625

Change out the radiator cap for a lower pressure one.

1 people found this helpful.
116,115

Great glad I could help.

I'm overheating removed thermostat new radiator and fan is working new radiator cap don't no what to do

116,115

Run a block check, you can get a kit at your local parts store, follow the directions exactly. If it tests positive then pull the head and have it checked for cracks, if tests ok then have it milled flat and reassemble, install a new thermostat and hoses if needed and that should do it.

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