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Heater don't work - 1999 Chevrolet Blazer

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If the coolant and thermostat is over 2 year old then it is time to do a coolant flush to get all the deposit out.

Flush fill the coolant reserve tank slowly. I recommend put the car on an oil change ramp to prevent air pocket.

Posted on Jan 20, 2014

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Might be a clogged heater core. Could also be a blend door motor Make sure you have antifreeze up to proper level. don-ohio

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First I recommend checking that your coolant level is good. Please check this cold so you don't risk getting burned. I have seen too many heater complaints where the coolant level was simply too low to fill the heater core. Next, you should check if the heater control valve is operating. I don't have any GM experience, but heater valves are often the cause of intermittent heater operation in many cars. Good luck!

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Heater gives warm air then cool air


That's usually a dirty,clogged heater radiator. How's your antifreeze look? If it's dirty,flush the system out.
But to get your heater working........look down on the firewall and you'll see a coupla' heater hoses entering thru that go to your heater radiator. The trick is to flush backwards from the usual flow direstion that trapped the debris in there.
The flow goes from the hose near the thermostat area into the heater radiator and comes out the other hose and returns to the water pump.
Take these hoses loose from the thermostat area and from the water pump,when the car's engine has cooled.
Now take a regular garden hose with a pistol grip nozzle(just the old cheap type) and hold it tightly to the water pump heater hose and force water back thru the heater radiator.VERY IMPORTANT! DON"T get any water in the alternator and don't let any get into the dipstick of the oil or transmission while you flush!!!
Make sure the hose is directed downward where the debris will come out. (you can tie a large white sock onto the end of the hose and you'll see the debris that you flushed out when you turn it inside out)
Now you have an option to funnel some radiator flush down into the heater radiator and let it sit for an hour,and then reflush the heater the same way and then reconnect the hoses.Enjoy! don-ohio (:^)

Dec 11, 2011 | 2000 Mercury Grand Marquis

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Heater takes a long time to heat up


When you select A/C or Heater, there is a door (vent air flow change) that open and close when making these selections.

Dec 05, 2011 | 1995 Chevrolet K1500

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98 ply breeze heater blows cold air, replcd water pump, radiator, thermostat, filled w/coolant, no leaks inside car, both h/c hoses are warm, bled coolant system, fans work. Would the heater core be...


Yep! Take the heater hoses loose from the engine(one at water pupm\\mp and other one at thermostat housing area usually). Then take your water hose at your house,with a common old pistol grip nozzle,and spray water back thru the heater hose you took off the water pump side and that will force it back thru the heater core and out the hose you took off the thermostat side.
If you want to see the junk that flies out of it,tie a white rag or old tee shirt onto the end of the hose.You'll be amazed what flies out of there.Reconnect your heater hoses and see how it does.
I always fill the hose full of water so when I reconnect them,they don't have any airlock problem. don-ohio (:^)

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1 Answer

1998 lincoln town car when i turn the temp to 90 it still wont get hot have changed the thermostat, and flushed heater core but it still won't get hot the AC works great just don't have no heater...


Just a stab at it................see if there's a vacuum or electric operated valve in the heater hose lines.Trace it out.The heater hose goes from the thermostat area at intake manifold thru the heater core,and back to water pump area. don-ohio

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1 Answer

A/C works fine but i have no heat coming out of the vents


Blender door not working on heater/AC box.OR.....it's a severely plugged heater core.don-ohio

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