Transmission Fitting Leak - Car Troubleshooting


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Transmission Fitting Leak

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Auto Repair Home>> Automotive Repair>> Car Troubleshooting

CountryPlumber
New User

Jun 27, 2011, 7:44 PM

Post #1 of 3 (3248 views)

Transmission Fitting Leak	Sign In

Ok I have a GMC 2002 Savana cargo van. 5.0L V8. 110,000 miles total. I checked my coolant level and it was low. I statrted to check it every morning and it would be a bit low. So I started checking around and found a crack in the black plastic on the left side of the radiator that holds the unused engine oil cooler tank. Ok no problem I replace the radiator and the upper and lower radiator hoses. The new radiator came with a few fittings. I install the appropriate size fittings for the transmission lines. I did not add any teflon tape....it appeared they had tape aready on them. Maybe I should have added my own.

Anyway I tightened them in good and snug. I drove it around the block and had a small leak out of the threads of each transmission line. I tightened them a bit more. Drove it around the block about 2 or 3 miles and no more leak. Today I drive the van all day in 100 degree heat and I'm getting a leak at the threads between the threaded fitting where it screws into the radiator.

Also the lower hose is some off brand.....its too short and the serp belt will rub it if I dont cheat the hose were it connects to the lower radiator connection by about 1" I think I'm going to find another gates hose like I originally had.

My question is why do you think my threaded fittings are leaking? And what would you do to stop the leak? I'm thinking teflon tape but aren't those inverted flare fittings?
My tranny lines connect to this fitting with clips......my problem is where the steel fittings screws into the radiator threads.

Thanks guys!

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 28, 2011, 3:11 AM

Post #2 of 3 (3235 views)

Re: Transmission Fitting Leak	Sign In

Just use some teflon tape or gasket sealer on the threads.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

CountryPlumber
New User

Jun 28, 2011, 6:49 AM

Post #3 of 3 (3230 views)

Re: Transmission Fitting Leak	Sign In

In Reply To

Just use some teflon tape or gasket sealer on the threads.

Thanks for the reply. I guess i will try the teflon 1st. I did the repair because it was on sunday when I found it and I had work scheduled for monday. I own a small plumbing business. I typically do not do my own auto work.

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