Cycles it on and off based on attached thermometer setting
Probably the Heater Fan Thermostat. It may have a different name.
Heater works fine in my Wrangler! Check the thermostat or the hoses or heater core might be plugged. The thermostat is easiest ^ cheapest to change so start there.
Probably your thermostat
That or the thermostat.
I would guess the thermostat I would guess the thermostat
It could be that your head gasket is blown.
MY CAR WAS DOING THE SAME THING NO HOT AIR COMING OUT OF THE HEATER I CHANGED THE THERMOSTAT. IT WASNT THE THERMOSTAT. I GOT TO CHECKING AND THE SEAL IN THE WATER PUMP WAS BAD. I REPLACED THE WATER PUMP AND IT WORKS FINE NOW.
if the blower motor works most likely heater core is bad. need more info
the thermostat used to control the heater and after we select the four pole switch to some number the thermostat start connect the power to the heater at the same time the heater start to heat and when we select the switch to zero position the heater not work
thermostat
It could be a blocked heater core if your fan works... Or it could be your thermostat... I have an 03 that is doing the same thing. I just replaced the thermostat and it is still doing it. There is a site called BlazerForum.com you may get some better answers there
The recommended thermostat for an electric baseboard heater is a line-voltage thermostat designed specifically for use with electric heating systems.