Check the following first...........
1. Coolant level.
2. Inside heater door operations.
3. Lastly check the heater core and make sure that its not clogged up....
My 1992 Saturn has heat until you change the blower speed what is the problem?
Possibly the Blower Motor has stopped working. This was the case in my 1994 Acura Legend. I just replaced it, and now the heat works great again!
heat works in back not in front front blows hot for a few mins then cold
probably the heater core is plugged
Why does my 99 silverado have no heat and the ac fuses look good and blower motot works great
my 1999 winstar was doing this and it was the blend door
There is a little motor, a fan, and coils. These coils heat up with the motor causing heat that heat is then pushed by the fan into the direction you want it.
check coolant level
blower fan not working
If you have no heat in your 02 grand Cherokee limited blower works heater lines are hot good circulation just no heat comes out?Maybe blocked heater core. Also check thermostat.Your problem is with the blend doors in the GC. Check the HeaterTreater eBay listings for diagnostic information and a fix.
Regardless whether the A/C or heat works ,the majority of vehicles GM built the blowers never completely turn off they run on low.
try wiggling the wires at the blower resistor if don't work then tap on blower motor