A/C freon disappears in less than 24 hours. I added dye but don't see any traces under the hood anywhere so I assume it must be the evaporator coil leaking but don't know the best way to get to it. Can someone tell me the best way to replace the evaporator coil? My vehicle is: 1999 Chevrolet Corvette C5 2.57L gas.

SOURCE: A/C Freon Loss under dash

I have the same problem with my Focus, except it does not leak out that fast. The evaporator coil probably has a hole in it. I took one out of a used car and found a bunch of leaves up against it which precipitated oxidation and its failure. The connections for the coil are just outside of the firewall. If you are thinking about changing the thing yourself, the first thing you need to know is that Ford only sells the whole heater assembly - it costs $525, and that it is a seriously painful operation to get it out. You have to remove the WHOLE dash and more. Good Luck.

Jeff Barton

• 520 Answers
• Posted on Jun 23, 2009

SOURCE: 1995 Chevy Suburban blows cold once charged then hours later hot

Its a leak ...probably concealed like in an evap housing or rear air unit and lines (if it has that). Prob at this juncture I would remove all the freon and bring system into a vaccuum with a pump and see if it will hold vaccum for an extended period of time. A bad leak will not hold srong vacuum very long and much cheaper than wasting expensive and enviromental un0friendly refrigerants.

SOURCE: Told 2002 BMW 325i Evaporator Leaking

1- If they find the leak in compressor, then only compressor needs to be changedwhy others have to be changed unless they see the leak at each port of others. I don't beleive they can see the leak at evaporator since they didn't touch your dash board, Only if they guarantee to make it work with 770 on all others, it is a very good price it the dash board labor is price included, You can ask to clear it up. If total price is lower than #2 then go for it.

2- The 1600 price is the same as few years back. I like this place because because they tell you up front having to pull out the dash board, to get to the evaporator. You have to see how hard to get the evaporator out to work. Because refrigerant and labor are expensive in troubleshooting, they want to repacle all for sure. Good luck on making a good deal.

SOURCE: 1998 Chevrolet 3500

I would try replacing the control unit, they are prone to fail.

SOURCE: recently I have purchased a used 2003 Chevrolet

Yes a tube should go right down and out the bottom of the vehicle. Sometimes road debris cloggs the tube because it is near the rear wheel.