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Unread 07-08-2011, 01:46 PM   #1
Zj1994
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1994 FSJ Cherokee 
 
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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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Unread 07-08-2011, 02:16 PM   #2
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.
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Unread 07-08-2011, 02:17 PM   #3
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
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Unread 07-08-2011, 10:42 PM   #4
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.
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Unread 07-08-2011, 11:14 PM   #5
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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Unread 07-10-2011, 08:20 PM   #6
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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Unread 07-10-2011, 09:09 PM   #7
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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Unread 07-11-2011, 10:53 PM   #8
ratmonkey
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Quote:
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.
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