Jeep Overheating/Smoking - JeepForum.com
 
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post #1 of 8 Old 07-08-2011, 01:46 PM Thread Starter
Zj1994
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Jeep Overheating/Smoking

I have a 1994 Jeep Grand Cherokee 5.2. For the last three years, it has had a problem with overheating in the hotter months of the year, but only if the air conditioning is on and the Jeep is idling. I recently had the transmission rebuilt, as well as a complete overhaul of the coolant system (water pump, thermostat, radiator, fan clutch, hoses). We also replaced the AC compressor. The problem still persists, and there is a lot of white smoke being emitted from the exhaust, especially when idling. The smoke problem started about a year ago. We are completely baffled at what this problem could be. I know it isn't a faulty gauge because the Jeep begins to sputter and the RPMs decrease when the gauge reads hot.

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post #2 of 8 Old 07-08-2011, 02:16 PM
sebian
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Sounds like a possible head gasket issue, or warped/cracked cylinder head. Especially with the white smoke from the exhaust.

1995 ZJ 5.2L V8 318. 230,000 miles and still rollin.

List of parts not replaced yet:
...
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post #3 of 8 Old 07-08-2011, 02:17 PM
yzjwk
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Quote:
Originally Posted by Zj1994 View Post
I have a 1994 Jeep Grand Cherokee 5.2. For the last three years, it has had a problem with overheating in the hotter months of the year, but only if the air conditioning is on and the Jeep is idling. I recently had the transmission rebuilt, as well as a complete overhaul of the coolant system (water pump, thermostat, radiator, fan clutch, hoses). We also replaced the AC compressor. The problem still persists, and there is a lot of white smoke being emitted from the exhaust, especially when idling. The smoke problem started about a year ago. We are completely baffled at what this problem could be. I know it isn't a faulty gauge because the Jeep begins to sputter and the RPMs decrease when the gauge reads hot.
White smoke = blown head gasket . That could be the problem .

Good timing Sabian

5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
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post #4 of 8 Old 07-08-2011, 10:42 PM
ratmonkey
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How could white smoke from the exhaust be that baffling? Classic symptoms of a blown head gasket or cracked head.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #5 of 8 Old 07-08-2011, 11:14 PM
phitmein
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too many unknowns here maybe ...

I see grey smoke at start-up, till it's hot and I am adding a ship load of coolant for the last year or so ..

or not ???

Are you adding coolant ???

Also: " as well as a complete overhaul of the coolant system (water pump, thermostat, radiator, fan clutch, hoses"

new heater core ???
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post #6 of 8 Old 07-10-2011, 08:20 PM Thread Starter
Zj1994
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If there was a cracked head or head gasket would there not be water in my oil?
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post #7 of 8 Old 07-10-2011, 09:09 PM
phitmein
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Are you having to add coolant or not ???

Remove your oil filler cap and look on the bottom of it for signs of moisture ...

Edit: did you replace your rad. cap too ???


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post #8 of 8 Old 07-11-2011, 10:53 PM
ratmonkey
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Originally Posted by Zj1994 View Post
If there was a cracked head or head gasket would there not be water in my oil?
Not necessarily. Could get oil in coolant, coolant in oil, oil in cylinder, coolant in cylinder.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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