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This is probably a stupid or easy question, i just replaced the heater core well the whole unit in which the heater core is in on my car ( R33 GTR ) on the new unit i can not connected the two metal lines i belive they are the air con lines, i have connected the smaller one on with no worries but the bigger one i cant seem to get on due to the thread being worn, im not 100% what line does what so i just want to know if i can drive with it disconnected and still use the heater in the car and what is the line 100% as im not sure.post-37707-0-08420800-1339763738_thumb.jpg

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How bad is the thread...

You might need to 'bend' the pipe a little so that the nut and threads line up parallel, and if it's not too bad you may be able to dress up the thread with a small file, then lube it with some anti seize.

Good luck.

Big line will have up to 120 psi so will need to be done up well. If the hose end is damaged I would try get a hose from here that someone has pulled out of their car of get one made up. Depends how bad it's damaged. Maybe clean it up with a thread file.

I would get the place who gasses it up to pressure test with nitrogen if your not sure about your repair. Either way it's not vital to running

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