Heater Not Working

IF YOU CAN'T FEEL THE AIR FLOW OUT BUT YOU HEAR THE BLOWER MOTOR WORKING, BEHIND THE GLOVE BOX IS A CABIN FILTER.REPLACE FILTER
IF YOU HAVE GOOD AIR FLOW BUT NO HEAT:
1;VACUUM LEAKING TO HEATER CONTROL
2;WATER PUMP GOING BAD / NOT CIRCULATING COOLANT,HIGH RPM/MORE COOLANT TO THE HEATER CORE
3;OPEN THERMOSTAT/ENGINE TEMPERATURE TO LOW
1;CHANGE THE DIRECTION FROM VENTS TO FLOUR TO WINDSHIELD. IF NOTHING HAPPEN IS THE VACUUM
2;RUN THE ENGINE INSIDE ON WARM PLACE ON IDLE.NOTE THE GAUGE IF PAS 1/2 TO 3/4. IF PAS 3/4 MARK REPLACE WATER PUMP
3;IF GAUGE STAY BELOW 1/2 REPLACE THERMOSTAT
GOOD LUCK

I had a 2003 caddy dts same issue the blower motor has probably gone bad u can order them online. What u can also try is kicking under the passenger side glove box area that's where the blower is located sometimes they get stuck. Try kicking or tapping under there and see if it pops on. I did this with my car

Sound`s very much like an air lock.set heater to hot run engine (rad cap off) switch on blower to max.and see what happen`s..Hope this help`s..

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These details will help.
Thanks.

If it is the fan/blower that is not working (as opposed to what is coming out is cold), then the problem could be 1) fuse 2) Blower Resistor. I just replaced the blower resistor in about 15 min with a $25 replacement resistor. The unit is right behind the glove box.

If the problem is that the air coming out is cold and not hot, then the thermostat, radiator, heater core, etc... are the more likley causes.

Roger it sounds like the blower motor is not comming on. There is a resistor network located in the engine compartment on the passenger side mounted to the firewall, that controlls the blower motor. The connections may have corroted or the unit itself is bad. That was the first thing I had to relpace when I got my used 92 Dakota. There is also a 30 amp fuse in the fuse box under the dash board . If that is blown I would suspect the blower motor is seized up or just pulling too much power.

YOUR HEATER CORE NEEDS REPLACED ITS LOCATED IN THE UNDER DASH PANEL ON PASSENGER SIDE.

t stat could be stuck open or could be a bad heater valve -cable,or a bad blend door

if the heater hoses going in and out of the heater core are hot, then your temp blend door is not moving to allow heat from the heater core into the car. either the temp knob or blend door motor is bad. some are vacuum, some are electric.

You can check the blower motor resistor. Almost positive that will get your heater working again. Good luck and best wishes. I sincerely hope that I helped.