1999 750IL Transmission Fluid in Radiator! - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 05-30-2013, 12:29 PM
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1999 750IL Transmission Fluid in Radiator!

I just bought my first BMW! I got it cheap but i'm sure it was at a price to pay to fix it.
The bimmer only has 110263 miles.
It was over heating and the transmission goes into failsafe mode.
I have replaced the coolant bottle, temp sensor and cap, while doing this i noticed red milky crap in the radiator. I am also changing the thermostat because some jack A** took the thermostat out and the car was giving a code P1622 because it wasn't there.
So i am thinking that the radiator has a leak in it and trans fluid is going into the radiator. While pulling out the radiator i noticed that there is only one hose that connects to the trans cooler.
So my question or questions are has any body had this problem and do i just change the radiator or is the leak in the actual transcooler under the car?
1999 750IL Transmission Fluid in Radiator!-img_20130530_122128_684.jpg
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#2 (permalink) Old 05-31-2013, 08:10 PM
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Welcome to Bimmerwerkz

Did you not have the car inspected prior to purchasing? Have you resolved the over heating issue?

Here are the parts diagrams for the transmission cooler and radiator:

Transmission oil cooling BMW 7' E38, 750iL (M73) ? BMW parts catalog

Radiator/frame BMW 7' E38, 750iL (M73) ? BMW parts catalog


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