Determining the Location of the Transmission Return Line on a 1992 Pontiac Grand Prix

Expert Reply:

I am not sure of the exact transmission in your 1992 Pontiac Grand Prix, but from my research the location of the transmission return line on your transmission is the horizontal line leaving the transmission. You should be able to follow that line to either the top or bottom of your radiator.

The easiest way to verify which line is the return line is by starting the car and putting it in drive for a few minutes. The cooler of the two lines will be the return line.

If you can tell me the exact transmission you have in your vehicle, then I may be able to give you a better idea of the exact line. You may also be able to contact a Pontiac dealer directly for information.

The Derale Series 8000 Transmission Cooler, # D13502, you referenced on our website is a great choice for your vehicle. You will also need Radiator Adapter Fittings for GM, part # D13018, which will install in the radiator tank to allow you to connect the hose to the transmission cooler.

I have provided some information on transmission coolers for you to check out and an installation video.

expert reply by: John H