96 Tahoe heater air con fan on the fritz

typical set up is two fans in engine bay
engine cooling fan is separate
air con fan runs flat out when air con is on to cool condenser

Turn the heater tap to hot setting.

Isn't your heater supposed to blow hot air?

have you tried the blower resistor

check the air ducts for proper operation and check a/c heater switch if eguiped with filer check it

i guess the simple answer is turn on the switch, but you're probably already doing that. if it's blowing cold air when it set to hot, you may have air in the cooling system, or a blockage somewhere, usually in the heater core. if the fan isn't working at all, check fuses. if they're good, check for voltage at the fan itself and replace it if necessary.

the blower motor has no affect on the AC system,
start the engine and turn on AC and watch the AC compressor to see if clutch engages,if it doesn't the system isn't full,if you are correct the clutch should be engaged and should quit when you change heater speeds,

Hi, the problem your having could be something simple like needs the air con gas topping up this needs to be done at a garage.
If the gas level is ok then the aircon belt needs checking making sure it has not come off.
If both of these are ok then the problem could lie with the aircon pump itself this can be replaced but at a cost.
So get the gas checked and the belt the drive the air con pully.
Hope this is some help to you let me know if you need further assistance

the light should be on when air con is working. only works when the blower is on ,ie heater blower switch on=air con light lit up = aircon working.

ok when ur sitting there no hot air is coming in to the air con radiator at front of car because your not driving
but when your driving it comes in but stays cold because the fan kicks in is your aircon fan working?

or does it need more gas thats what else can cause this