Transmission fluid in coolant
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Junior Member
Joined: Dec 2011
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From: Lehi, Ut
Year: 1997
Model: Cherokee
Engine: 4.0L
Transmission fluid in coolant
I have a 97 xj with 4.0l. It never gets hot or overheats but the transmission fluid gets into the coolant and I have to flush. Any ideas on how or where the fluid is getting into the coolant and what I can do to stop it.
CF Veteran
Joined: Nov 2009
Posts: 8,172
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From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
The tranny fluid cooler is located in the drivers side of the radiator. If tranny fluid is leaking into the motor coolant, most likely motor coolant is also mixing into the tranny fluid......replace the radiator ASAP and drain/change both the tranny fluid and coolant.
Last edited by djb383; May 13, 2012 at 08:30 PM.
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From: Lantana, Fl
Year: 1996
Model: Cherokee (XJ)
Engine: 4.Slow
Originally Posted by djb383
The tranny fluid cooler is located in the drivers side of the radiator. If tranny fluid is leaking into the motor coolant, most likely motor coolant is also mixing into the tranny fluid......replace the radiator ASAP and drain/change both the tranny fluid and coolant.
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Joined: Jan 2012
Posts: 433
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From: Yuma, AZ....yes the 3:10 came here
Year: 1998
Model: Cherokee
Engine: 4.0
Originally Posted by djb383
The tranny fluid cooler is located in the drivers side of the radiator. If tranny fluid is leaking into the motor coolant, most likely motor coolant is also mixing into the tranny fluid......replace the radiator ASAP and drain/change both the tranny fluid and coolant.
Exactly what I was going to say
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From: ☼ Blackhole Sun
Year: My Jeep is a GMC
Yep, radiator. Problem is when you shut off the motor when it's warm now the coolant is under more pressure than the trans fluid. Drop the transmission pan & flush so you get all the coolant out.
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
My guess is a 50/50 mix of tranny fluid and coolant in the cooling system is no big deal.....however, a small amount of coolant/water in the tranny would not be a good thing, no?
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Joined: Nov 2009
Posts: 8,172
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From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
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From: Oroville, CA
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
Anti-freeze will destroy an automatic transmission in no time at all, the chemicals in the coolant will eat the adhesive on the friction discs in the clutch packs. If you get a few thousand miles out of the transmission after flushing the fluid consider yourself lucky.
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