1988 Jeep Cherokee overheating

Tiny
ERIQUE
  • MEMBER
  • 1988 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 26,000 MILES
I can run the car for about twenty minutes in town or get on the highway and it will run, but once its idle after the highway it overheats to the point where my overflow container is boiling and smoke comes form there, I have change theromstat, waterpump, and drain and check my lines and still it will overheat. Did I or am I missing something here, Help me please.
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Tuesday, July 7th, 2009 AT 5:40 PM

4 Replies

Tiny
RASMATAZ
  • MEMBER
If the radiator is not clogged-up and cooling fans are working try bleeding the cooling system could be air in it.
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Tuesday, July 7th, 2009 AT 6:14 PM
Tiny
ERIQUE
  • MEMBER
Ok did that and no air in the lines, but it gets to a normal temp an its start boiling, and the cap is on tight. Damn I'm at a point where I wanna just drop kick it to hell. What else could it be?
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Tuesday, July 7th, 2009 AT 9:37 PM
Tiny
RASMATAZ
  • MEMBER
Get it block and pressure tested
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Wednesday, July 8th, 2009 AT 5:29 AM
Tiny
GTHOPKINSON
  • MEMBER
I had the exact same problem for 2 years on my 88 cherokee. Radiator wasnt leaking, hoses were fine, cap was tight on overflow tank. Or so I thought.

The 88 uses a radiator system that is pressurized through the overflow tank instead of radiator cap (which it doesnt have). Yea stupid design, but it is what it is. What finally solved this problem for me was replacing the actual coolant overflow tank. The tank is plastic, and the threads wear out over time and become slightly warped just enough to cause the cap to not "seat" just right and hence not hold the pressure correctly. Even replacing the cap doesnt work, because the threads on the tank are the issue. The reason you aren't having problems at highway speeds is because there is more than enough air flow to offset the faulty overflow tank not holding 100% pressure. But, once you take away that airflow in regular traffic the thing overheats.

Replace the tank. You can get a good 3rd party one (not the Jeep OEM one) that comes with the cap for about $30 dollars.
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Thursday, March 11th, 2010 AT 11:52 PM

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