rlvincent
Active member
I just purchased a 93' Vette, and when I turn on the air conditioner fog comes out of the air ducts????
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If you do NOT smell antifreeze (you do have antifreeze in the coolant?) when the A/C is turned on, the heater core is likely not leaking. Especially in the humid south, the A/C evaporator can retain condensate water and fog the windshield upon starting. This is especially true if the car was parked in hot surroundings (with A/C running) then started later in the cooler part of the evening. A plugged A/C condensate drain or low refrigerant charge induced frosting of the evaporator coil will exaggerate this phenomenon.
Your symptoms frequently indicate a leaking heater core. But that's such a PITA to fix, check out all the other possibilities and hope for the best.
Good luck.
BTW Welcome to a great site and come back often, especially to post the outcome of your situation.
It's usually necessary to 'bench bleed' a new master cylinder in order to get full depth travel of the piston and push out all of the air. Did you 'bench bleed' the master cylinder? If not, there may remain air in the cylinder and cause a soft pedal and perhaps a warning light. If pumping the brakes stiffens them up, that's a sure sign of trapped air.
There's a sensor on the rear hatch that may need adjusted, or make sure that the latch is positioned to hold the glass down tightly.
Good luck.
PS sorry for the delay, the wife called for dinner.
OUCH !! They're a pain:eekIt was the HEATER CORE.
Could be a line,hose or caliper ..but if you're not leaking/loosing brake fluid....then it sounds like a internal leak in the master cylinder.BRAKE WARNING LIGHT - AND SOME TIMES REAR HATCH WARNING. I recently replaced the Power Brake Booster, and everything was fine. Now the brake pedal has more travel, and Brake Warning light comes on when brakes are applied?