I have an 82 Z28, and just had my air conditioning converted over to R134A. It works awesome, blows ice cold air, BUT.....when I run it for more than like 20 min, water starts to run out from under my dash....like it's coming from behind my radio area and runs down the floor "hump" and collects on my floor mats on BOTH sides. I've never had this issue with any prior third gens. This car only has 21k miles and nothing has ever been torn apart, inside or out. Anyone have any idea what is happening with this???? Thank you in advance!

 

Foreign matter lodged in the evaporator drain

You might be able to get to it through the blower motor and poke it clean with a coat hanger or something, but if not, ... gonna have to take the evaporator housing apart.

 

Thanks man!

 

Try running the AC on low fan speed. If you only see water on hi fan speeds like I do it is because when I installed a new evap it did not come with the mesh filter type screen on the driver side and when there is a lot of condensation the fan blew the water in to the dash and dripped on passenger side.

 

It seems like itleaks no matter what speed the fan is on. I drove it to a car show today and must have had a half gallon of water come out of it on the pass side before I realized it.

 

Then it may be what the expert guy who know a lot about these cars said.