groverwood

that's all she blows.

'93 SC400. no matter what temp i have the gauge set at, all i get is hot, hot air. even turning it off, slowly leaks out hot air.

I do know my A/C lines and fittings need replacement, but is that why all i get is hot hot air?

TheAzn

iTrader: (2)

The heater valve is probably stuck open. It's under the hood, on the passenger side up against the firewall, has a single vacuum diaphram/ canister on it with two coolant hoses going to it. I would try replacing that first or at least check the vacuum line going to it.

They're known to go bad. And don't even think about buying new/reman unless you want to spend $300-$500. You can source them easily from member part outs or local junkyards, roughly $40 to $100, depending on from who.

SFrymyah

iTrader: (4)

Switch the vacuum lines around on the valve - thats how I troubleshot mine.

carsmypnis

iTrader: (1)

press the button to recirculate the ac instead of outside air the pressure from driving pushes air in

groverwood

that's not it.

I'll try looking at the heater valve and lines. thanks guys

groverwood

by doing this, what results will i see if it's bad or good?

groverwood

ok, so I replaced the Heater control and the thermostat. I can now turn off the heat, but when it is on, it's always hot. i can't get just a simple vent breeze going. not sure what the deal is here.