Question about 1995 GMC Jimmy

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Oil in the rad - 1995 GMC Jimmy

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If it's brown, you have a blown head gasket and most likely there is coolant in the engine oil pan as well. If the oil is red, it's transmission fluid leaking internally from the cooler...Radiator needs to be replaced and trans oil needs to be changed. You should not drive or run the engine with either condition.

Posted on Oct 02, 2009

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  • Richard Scordino Oct 02, 2009

    Hope it turns out to be the cooler...cheaper to fix!!
    Good luck!


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1 Answer

My Jeep grand Cherokee 2.7 2003 mixes oil with water in the reservoir.


engine oil brown, or ATF oil, pink/red/maroon?
did you look in the rad neck , and then drain out some (by any means)
rad coolant to a jar
let it settle and LOOK, see that oil pool up.
and say, (engine oil or ATF to self?)
first check transmission oil (at dip, or drain it)

if it has has any signs of milkshake color, (cream) BINGO.
the 14psi coolant is pushing in to the transmission too.

try to understand. this:
trans cooler in rad, bottom can be breached.
when you start and engine the trans pump pushes AFT to the rad.
then when engine gets hot, the 12-14psi RAD pressure reverses this flow , coolant to trans.
why not pressure test the trans cooler next, or first.

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I replace the oil pump and the oil sensor, and the oil light keeps beeping and the car is over heating, and the fan is not running


Check to see if your thermostat needs replacing. Sounds like a rad over heating problem.... oil pump problem would seize your engine...open rad cap on a cold engine, start her up and look down into rad, takes a few min but if it doesn't circulate after 4 min then your water pump or thermostat needs replacing

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1 Answer

Oil in coolant Dodge truck 5.7


Color of oil? Dark, is engine oil, looks more red, transmission oil. If engine oil, head gasket/intake gasket may be defective and leaking. If more of a red shade, transmission oil mixing in rad, as transmission is cooled through radiator. Faulty rad will cause them to mix.

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yes its expensive ,so disconnect the oil cooler pipes from the rad then buy some copper pipe about a 1/4 then make a nice few tubes with a plumbers pipe bender and make it fit infront of the rad or the ac rad where applicable then use a compression joint to connect it all up this will work just as well ,seal up the oil connection on the radiator with a couple of blanking plugs and away you go

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How do you get the transmission fittings off the radiator. There are no threads at the ends going into the radiator. I am trying to replace the radiator


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