just bought the 89 xj ex chp. has 4 wheel drive and its an auto. but enough about the working parts. any suggestion on why it still overheats? i have replaced the thermostat, water pump, radiator, every single hose, and radiator cap thats on the tank. maybe about 5 minutes into driving the thing (not even reving high or going over 20mph) the temp gauge shoots up like crazy. i shut the car of and nothing happens. no spewing of coolantm or steam. not even an odd hissing sound. im out of ideas here and about to go crazy!!! :dunno:
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Replaced whole cooling system and still overheats!
- Thread starter FireFly
- Start date
The Lure Washer
NAXJA Forum User
- Location
- Bristol, CT
Do you have a heater bypass valve on there? If you do, it sounds like you may have it hooked up on the wrong side of the lines.
- Location
- San Diego
search on how to bleed the system of air. these ones with the bottles like to hold air in. i bet thats your problem, you need to burp the system. i dont think its even possible for coolant to get that hot that fast in these engines, its air.
The Lure Washer
NAXJA Forum User
- Location
- Bristol, CT
Let us Know~!
Loose clamp, I hope? Cherokees with closed systems run about 16 pounds of pressure. The plastic filler cap on the turtle tank is a pressure cap, hard to find for some when it goes.
Get all the clamps good and hand tight with a screwdriver, burp, and try again. 210 is about right on the 89, the temp sensor is in the drivers side radiator tank and operates a little late running the electric fan. With 16 pounds of pressure, tho, no problem, the boiling point is past 228*.
Get all the clamps good and hand tight with a screwdriver, burp, and try again. 210 is about right on the 89, the temp sensor is in the drivers side radiator tank and operates a little late running the electric fan. With 16 pounds of pressure, tho, no problem, the boiling point is past 228*.
old_man
NAXJA Forum User
- Location
- Loveland, Colorado
The lower hose should be running a vacuum not pressure. Only two things I have seen can cause that. Either you have the serpentine belt routed wrong, or somewhere along the line, the wrong water pump was installed. They look the same on the outside. Your pump should have a cast or stamped R on it. The pump from a 2.5L or some 4.2L's look exactly the same but pump water the other direction.
ladywolf
UH-60L Jeep Chick
- Location
- Clarksville TN
my 89 sits exactly at 210, never wavers, cept on startup when its cold.
the hose clamp was not installed right (dummy error) as for the burping it worked! the car does no over heat and sits like i said right under 210 so im hoping thats fine. thank you all for your knowledge and advice!!! This is why i love jeeps and the people who love them too.
The Lure Washer
NAXJA Forum User
- Location
- Bristol, CT
Glad everything worked out for ya!
- Location
- Roanoke VA
Park the jeep on a hill with the rear end higher than the front, with the engine cold, remove the small brass temp sending unit from the rear of the head(be careful not to break it off in the head) then fill the reservoir until AF comes out that hole. Re-install the sender. Thats how I have been burping my 90 for years.
- Location
- Roanoke VA
I should have added that this is done after filling the coolant system, for burping only!