Couldn't find a leak so we used the dye with the freon less than an hour later hot air and no leak anywhere.
Probably leaking inside cabin area under dashboard.
SOURCE: 93 gmc sierra heater not working
THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY HEATER
SOURCE: A/C blowing hot air and can't find leak....
Its probably inside the dash, either in the coil or the connections
SOURCE: My air blows hot
Got to your auto parts store and get a can of R-134a refrigerant with the filling cable, but make sure it's the version that has the red dye in it. Run your car with the A/C and add the canister to the low pressure side of the A/C hookups. The dye will show you the leak, but it may not be in the engine compartment, it may be at the heat exchanger inside the dash, which is difficult to access.
SOURCE: My Air Conditioner in my 1994 GMC Sierra V6 Truck
I BROUGHT A 94 SIERRA, THAT WAS IN A ACCIDENT. THE DOOR WON'T LINE UP, EVEN WHEN I ADJUST THE BOLTS. IS THERE ANY OTHER WAY THAT I CAN LINE IT UP?
SOURCE: 2002 yukon ac blows hot
he may not have checked the evaporator core which is under the dash. you can take off the black cover in the passengers floorboard. should be two 7mm screws then there is a long thin black piece that unlatches revealing the cabin filter. remove the cabin filter and look for signs of a leak if he put leak dye in it. or look for oily residue.
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