Transmission cooling line leaking at radiator after rad replacement.
I replaced the radiator in my 97 GMC Sierra
yesterday and after a short test drive I see a
lot of transmission fluid all over the place
under the upper fitting. How does one go
about getting a proper seal on that fitting? It
looked like a flange fitting, and I was very
careful to not cross thread or strip the fitting.
I tightened it to a firm snug on both. Am I
supposed to have used a thread sealant?
You shouldn't need a sealant, I use Teflon tape on my lines and has worked well. You could also use Permatex High Temp sealant.
I've used both and they work to give you that seal you want.
I actually got it to seal by backing off the nut and jiggling the line and I guess I got a better seating the second time around. That problem is solved. Now I'm seeing a small amount of coolant below the filler neck. I'm guessing I should replace the radiator cap as it must be where it's coming from?
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