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The most probable cause is low coolant level. After that you may have a bad thermostat or possibly a clogged heater core. You really need to give more info for a better answer. Does it work when the vehicle is moving but not so well when waiting at a light? Is the blower working? Is it not working at all?
What else can I help you with?
Why wont heat work in 1999 Chevy s10?
A blockage in the heater core is the most likely cause. This is a difficult and expensive repair.
What would make the heater not work in a 1999 windstar?
Not a whole of symptoms to work with here...The most common cause of "... heater not working..." is a failed temperature blend door actuator motor.See "Related Questions" below for more
Can a leaking heater core cause your ac not to work in 03 durango?
You may smell coolant when the ac is running but a leak in the heater core won't cause the ac not to work.
Why doesnt the heater work in 1999 Nissan sentra?
because it's broke
What can cause heater not work?
Possibly the Heater Motor, if the fan is not coming on at all the bearing in the motor have probably gone out.
What would cause turn signals not to work in Lincoln navigator hazards work fuse not blown.?
Turn signal flasher module?
Will a weak circut breaker cause a water heater not to work?
Yes
Why doesnt the heater on your 1999 Chevrolet suburban work?
Could be: Low coolant in the radiator - or - thermostat stuck open - or - heater core plugged.
Heater doesn't work - 1999 ford f350?
The blend air door is probably broken.
Will low coolant cause a cars heater to not work?
Yes. The coolant carries the engine heat to the heater core. Without coolant the heater core does not get warm.
What would cause the air conditioning to work only in the high setting in your 1999 buick century?
Change your heat control sensor it mount on your heater motor on most models, it reduces the amount of voltage to the fan motor.
Why doesn't the Heater Fan work on first 2 settings on a 1999 Camry?
Blower motor resistor has failed
