Question about 1998 Dodge Grand Caravan

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Anti frezze and transmission oil mixed

My anti freeze and transmission oil mixed together making it look like a strawberry milk shake. We were told that are cooler and thermostat need to be replace. My husband is going to replace them as well as a new radiator he is also going to flush the transmission also, will this fix the problem or is my transmission gone?

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  • maclean2006 Nov 22, 2008

    Thank you! I changed the radiator as well as the cooler and t-stat flushed it all out and it is running much better. I noticed that i have an external cooler as well that i did not take off and when i try to go over 60 it reves. Should i remove that external cooler? I'm thinking that there could still be some of the fluids that mixed still running through it.

  • redwolf101 Dec 10, 2008

    Had the same problem as above, flushed coolant system, flushed trans, changed filter, brand new radiator 3 speed used atf+4 fluid. Fluid was red and beautiful after several attempts. Shifted fine drove for several days and on very cold day stopped shifting in any gear, finally got to move in reverse only. Any advice???


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The cooler for the transmission goes through the side tank in the radiator. It burst and caused a leak and the fluids to mix. Be sure to change the filter in the tranny as well as flush it. For the engine and the hoses, leave the t-stat out and run it with plain water and some dawn dish soap to carry as much of the oily residue out of the cooling system. You will need to do this several times, use about 5-6 oz. of soap when you fill the cooling system up to flush the oily mix out.

Posted on Nov 22, 2008

  • Tylar Gilman Nov 22, 2008

    The external cooler won't cause any problems as long as there is fluid going through it. You may need to flush the transmission again. It is also possible that there is internal damage to the trans. Most commonly are the lip seals and the friction discs in the drums. Is it a 3 speed or a 4 speed? What engine is in it?


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