Heater wont turn off. ac wont stay on - 1998 Oldsmobile Bravada

I would disconnect the fan connector and use contact cleaner to clean the connection. Usually corrosion. Also fan might be going bad (Common Problem).

If the moisture is oily, your heater core could be leaking.
If the moisture is dry, check to see if your ac compressor is running in defrost mode.
The air cond dries the air in defrost mode.

my acura tl fan turn on when i turn on air conditioning why

Does the engines electric cooling fan turn on when it gets hot? Does it cool off if you turn the AC on?

You will need to replace the Final stage resistor. You can find the part at your dealer, or get it at other parts stores. This is a common issue.

Relay to Blower is STUCk

With very little to go by here. I'd say you need to check the igniton switch, sounds like you are loosing power.

if the a / c does not cool you just feel warm inside because the gate that divides the box where the heater is mounted in the evaporator and the a / c heater is next to this is because the control panel will not work this is a electronic card that can easily replace

I'd check the relay and the resistor ...don't have a location for yours but the resistor is always installed into the heater box so it stays cool. you can usually follow the wiring back to the relay as it's generally nearby. Resistor looks like a piece of circuit board material with several wires connected to it with two screws holding it to the heater box so it sits flush except for the wires. It has several coils inside...any that are broken have failed.

mechanical or vacuum operated valve that releases hot coolant into the heater core may be stuck closed. or the heater core may be clogged. hope this helps.