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Cant find leak when putting freon in my 1999 chevy taho

How can I find leak. I think its behind the fire wall. How do I get to it

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@carlajean, Carla jean, Sorry to hear that your AC evaporator may be leaking, it is located under the dash of your vehicle and is a fairly big job for the DIY to do. Below 1st link is a video showing how to access the evaporator and the 2nd link explains how to test/detect A/C refrigerant leaks. If the job seems to be larger then you would like to tackle, have a good local shop have a look and estimate repair. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.

https://www.youtube.com/watch?v=yoDzJK1B...

https://www.youtube.com/watch?v=95RdGLFI...

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