I have had my 94Z in the shop numerous times where they cannot detect a leak in my system. They've tried dye testing and other diagnostics only to come up empty. Is there any reason why they are having such a hard time diagnosing this problem? I live now in Fl and the hot weather is approaching !!!

 

does anyone have an opinion? The shop ran numerous tests and can find NOTHING. Acording to them the pressure is fine and with a dye test nothing was found. Now they are telling me that it may be the evaporator and to check would have to remove the dashboard with hours and hours of labor? Help !!!

 

The problem is there's no traffic here any more. Maybe a half dozen of us why try and answer what we can. Over the 20+ years I have been here, I have not seen any unusual reports of difficult to find A/C system leaks in the 4th Gens. Also not sure the entire dash has to be removed. I would suggest you download (free) a copy of the 94 factory service manual, and review the procedure for accessing the evaporator.

https://www.mediafire.com/?40mfgeoe4ctti

Has the shop tried inserting an electronic freon leak detector probe into the box that encases the heater core and evaporator? There’s a small opening for a wire for the temperature sensor that inserts into the evaporator. Or even drill a small, easily resealable hole in the box to insert the probe.

 

I completely replaced my AC system in my 1996 SS last year.

The dash definitely does not need to be removed as the evaporator is accessible from the glove box compartment (although you first have to remove the heater core)

 

Thanks for your reply. now....if the leak is in the evaporator what all is involved in rectifying this situation? It seems it will be a very large bill.

 

Just saw Vances reply. Thank you

 

I have a number of shop visits for this situation and they have finally found the leak in the evaporator. This shop although having a good reputation advises me that they do not want to replace the evaporator because they are afraid with the age of the vehicle that the dash parts which have to be removed may be too fragile and afraid of breakage. I feel this is a bunch of bull and that they just dont want to fix the vehicle. Can I get some direction as to what all is involved in replacing the evaporator and do they have a valid point about being afraid of removing fragile parts ? From what I have read above it doesnt seem to be such a hard part to replace.

 

and to add to the above post this vehicle has been garaged for most of its life and in very good condition.

 

The factory service manual shows you how to access the evaporator. First step is remover the glove box to access the cover for the heater core, confirming Vance's advice. Free download of factory service manual:

http://www.mediafire.com/?40mfgeoe4ctti

The only other thing that might have to come off is the plastic dust cover under the bottom of the dash. That is not fragile.

Diagram from manual attached.