89 jeep Cherokee OVERHEATING!
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89 jeep Cherokee OVERHEATING!
Hey everyone I just bought an 89 jeep Cherokee and am slowly going through the jeep to get it up to par. It is running but overheating VERY quickly after start up. I have the closed cooling system still. I replaced the t stat, the water pump, the radiator and coolant reservoir and it's still overheating on me. I'm kind of at a loss of ideas right now, any help would be greatly appreciated! Thanks again.
#2
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Year: 1999
Model: Cherokee
Engine: 4.0
Hey everyone I just bought an 89 jeep Cherokee and am slowly going through the jeep to get it up to par. It is running but overheating VERY quickly after start up. I have the closed cooling system still. I replaced the t stat, the water pump, the radiator and coolant reservoir and it's still overheating on me. I'm kind of at a loss of ideas right now, any help would be greatly appreciated! Thanks again.
#3
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Year: 1989 Limited
Model: Cherokee(XJ)
Engine: I-6 4.0L AMC Renix
Check for air bubbles first. If that doesn't help I second the fan clutch. might be replacing it with a ZJ fan clutch later on today when I get my radiator rodded out. You can test your fan clutch by folding a magazine hot dog style and while your XJ is at 210, stick the folded magazine between the fan blades and if the magazine stops the fan, you need a new fan clutch. (Hayden #2737)
#4
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With the engine cold, take the cap off the overflow bottle and start it, let it run a a minute or two and see if bubbles come up through the overflow bottle.
#5
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Model: Grand Cherokee
Engine: 5200 cc
you might make it easier if you park nose up on an incline when you burb the cooling system. And my rule of thumb on fan clutches is , less than two revolutions when cold ,clutch is good. engine off , spin by hand .
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jangier (10-10-2023)
#7
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I was suggesting checking for bubbles as a quick way to check for a head gasket leak, not for burping.
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#9
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So the fan clutch is good I just got done replacing all of the heater hoses and topping off the system now I have a leak in the brand new coolant RES. Once I put the new one in Tmro I will try the suggestion of Parking at an incline to burp the system. Thank you everyone for your help. I'm really hoping it's not a blown head gasket. If so what are your thoughts on that bars gasket fix? Bad idea or worth a try?
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#11
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Year: 1990
Model: Cherokee
Engine: 4.0
It's nose down for burping. Mine was doing the same thing. Burped it and that helped a lot. Now I went to an open system. Way better. Never heats up now. Super easy.
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Ok I've heard both for burping head down and up? I'm pretty sure it's head down. Next step like you all have suggested is a pressure test. How do you all feel about bars head gasket fix?
#14
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Year: 1999
Model: Cherokee
Engine: 4.0
That "gasket fix" crap is a no no. Do not even think of using it. A head gasket is not all to difficult or expensive to do yourself. Just eliminate the thought of using bars.
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Year: 1999
Model: Cherokee
Engine: 4.0
Also, you burp a closed system with the back of your jeep higher than the front. This is so the air will travel up to the back of the head where you burp it and it can escape