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Re: Heater does not work
Check blend door motor for proper operation (vacuum operated) if necessary, detach arm from heater box and move by hand. If you have heat then, change motor! You are reaching operating temp for engine, right? If not, thermostat is stuck open... Change.
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sounds like your blend door is stuck in the middle of the operating range. this door directs air either fully or partially over the heater core or ac evaporator. when stuck in the middle u will alwaysd get a blend of both
Check out the heater hoses for warmth. Both should be the same with the water flowing. If they are not, the water is not circulating.
There are 2 ways the heater can work. One style varies the amount of water flow to control the heat levels. The other uses the blend flaps in the ducts to push air flow around the heater core.
If the heater hoses are not circulating water, a part called a flow valve is to blame. Check out the autoparts sites for photos of the flow valve for your car. If you have the blend flap system, a solenoid called a "motor" is not changing the position of the blend flap in the dashes' ductwork.
Make sure you have the coolant level at the correct level in the bottle resorvoir. If there is not fluid to circulate in the system, the fan will only blow a cool or lukewarm temperature air. If there is enough coolant, check that the water pump is working.
just had same problem with 2000 Buick regal , the thermostat was stuck open just a little , just enough so coolant didn't get hot ,so heater doesn't get hot .. not good on cold mornings !! temp gauge never went more than a quarter, should have been almost half
If you've changed the coolant recently, it could be air locked in the heater core. To remove park the truck with the front higher than the back and remove the radiator cap. Start the engine and let it run while watching for a big air bubble burp coming out the radiator neck. Top off the coolant and continue.
appears we have an Air lock scenario and you will need to perform a
the vehicle on level ground, when cold remove coolant filler cap,
start engine and leave to idle, turn heater on full and blower to
max. When engine reaches operating temperature watch and listen near
coolant filler, keep clear as gurgling and hopefully a boil over
should occur. Top up with very warm coolant and wait as it may do it
for heat inside vehicle if warm replace coolant cap but keep an eye
on temperature gauge as the ~Air lock may have moved on from heater
matrix/core so proceedure needs to be carried out again from COLD.
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