Why Does My Car Heater Work Intermitently?

Sounds like a clogged heater core. When they are clogged, they usually are not completely restricted. The core will sometimes get short bursts of flow which will provide heat for a few moments at a time

1. Any mechanics know??? Car heater problem?

You probably have a bad blower motor resistor

2. My car heater only blows out cold air, How can I fix this myself, and now have to pay a mechanic?

did you go to a auto parts store? Ask for manager tell him situation, he may know what you need. does your car need antifreeze.? is it electronic temperature control or mechanical. If it's mechanical check the cables/linkages. It may need a heater core, which is difficult to change if you are not mechanically inclined.

3. Why is my car heater / temp gage on the fritz?

You are correct in your prognosis. Sounds like a sticky thermostat. Have seen this problem many times

4. What causes a car heater not to work?

not enough detail........no fan?..blows cold? what is it doing..if anything....no fan=bad fuse,switch,blower motor........no warm air=low engine coolant,bad thermostat,bad heater control valve,air lock in cooling system,bad vacuum motor under dash controlling heat to vent to ac ducts,possible bad heater selector switch..........please try to be more specific

5. Car heater blowing cool air... why?

it sounds like you probably have a clog in your heater core or your thermostat is stuck open. More than likely it is a thermostat. When your thermostat sticks open the engine never fully reaches operating temperature because coolant is always flowing through the radiator from engine, being cooled. It gets even cooler when you drive because there is more air moving through the radiator when you drive cooling the coolant even more. ASE master tech.

6. Why is my car heater not running?

thermostat Radiator would make it overheat not thermostat

7. why my car heater runs only after i worm up the car?

Because your car heater is a radiator which uses the hot water from the engine radiator to work. Until the water warms up there is no heat to transfer into your interior. Aside, if your car starts overheating during the summer, you can actually turn on the heater and use the extra capacity to protect your engine.

8. Car heater won't warm up.?

Try replacing the thermostat it is only 6 bucks. If it's stuck open it will take a really long time for the coolant to heat up

9. Car heater wont work, only blows cold air?

step one always the same..check coolant level 2 thermostate sticking 3 heater core clogged...have u been flushing system on time as prescribed by Audi?? 4 hearer "blend doors" stticking if not heating up go to flush and thermostate replacement

10. 2004 Cadillac CTS -How long should it take for the car heater to warm up?

About a mile or two.

11. Car heater only works when pressing gas?

Heater core probably needs flushed. A radiator shop did mine

12. Why does my car heater blow out cold air?

It can be the HVAC controls or a bad thermostat

13. HELP Why won't my car heater work?

Is the car on?

14. My car heater is hot, then cold, then warm then cold; what could cause this?

Check out your heater control valve

15. no heat in my car, heater fan seems to turn on but no heat blows out, cool air, heater gauge normal?

clogged heater core, low on coolant, bad heater control valve

16. My car heater dosent work help me please?

Could be so many things wrong with it, go to a mechanic and get it diagnosed if you can not find any symptoms. As for keeping ice off the inside, maybe cover your car at night as best you can so no humidity gets inside.

17. What causes cold air to blow out of car heater?

It is probably the heating coil

18. Can you turn on heat when you've broken your car heater knob?

i broke it off my pontiac grandam and i just used a pair of pliers to twist the metal stick-like knob. I broke it completely off though. doesnt look pretty but i can still turn on my heater. :)

19. Why does my car heater only work on one side?

it might be the vent on the drivers side. maybe the door is,nt opening

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Impala No Heat at Idle
It turns out the problem is pretty common with 3.5L Impalas. For some reason these engines lose coolant. Some blame is placed on head gaskets, some blame Dex-Cool. What ever the cause, refilling via the overflow jug can leave an air pocket in the cooling system. The cure is to fill via the pressure cap right to the top. Recheck the level after several heat/cool cycles. Then never let the overflow jug get emptyI have 2006 impala that randomly will blow cold air at idle. Sometimes if I stop at redlight the heater will blow cold air. If I get the engine above idle by reving the engine to about 1K rpm it starts to blow warm again. The temp gauge remains at the normal spot on the gauge. The radiator and expansion tank are at the correct levels.·OTHER ANSWER:I have 2006 impala that randomly will blow cold air at idle. Sometimes if I stop at redlight the heater will blow cold air. If I get the engine above idle by reving the engine to about 1K rpm it starts to blow warm again. The temp gauge remains at the normal spot on the gauge. The radiator and expansion tank are at the correct levels.
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