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Old 12-05-2010, 11:22 AM   #1
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Heat only works when driving - '05 Elantra


Any ideas? When I parked and idle, the air blowing out of the vents goes cold. If I drive or rev the engine, I get hot air.


Thanks.

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Old 12-05-2010, 11:41 AM   #2
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Heat only works when driving - '05 Elantra


What year/make/model car? If your system controls are vacuum controlles, you may have a damaged/rotted vacuum hose/s.

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Old 12-05-2010, 11:45 AM   #3
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Heat only works when driving - '05 Elantra


It's a 2005 Hyundai Elantra.
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Old 12-05-2010, 05:03 PM   #4
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Heat only works when driving - '05 Elantra


Check simple stuff too,-in my company truck the water pump was leaking. When the coolant level went down, I couldn't get much heat, so check the coolant level.

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Old 12-05-2010, 07:25 PM   #5
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Heat only works when driving - '05 Elantra


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Check simple stuff too,-in my company truck the water pump was leaking. When the coolant level went down, I couldn't get much heat, so check the coolant level.
Ditto, Same here.
Do you sometimes hear gurgling sounds in the dash?
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Old 12-05-2010, 07:25 PM   #6
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Heat only works when driving - '05 Elantra


I'll check the coolant tomorrow, thanks. The engine temp on the dashboard gauge is normal (just under halfway), if that means anything.
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Old 12-05-2010, 07:34 PM   #7
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Heat only works when driving - '05 Elantra


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Ditto, Same here.
Do you sometimes hear gurgling sounds in the dash?

Can't say I have...
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Old 12-05-2010, 08:11 PM   #8
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Heat only works when driving - '05 Elantra


I just popped the hood and checked the coolant level...looks way low. What would cause this, is it an indicator of another problem? In any case, I will buy coolant tomorrow to top it off. I've never bought coolant, what type do I get, or is there no choice?
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Old 12-06-2010, 05:38 AM   #9
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Heat only works when driving - '05 Elantra


You seems to have a leak somewhere. Look for green or red drips around the engine or on the driveway. The kind you need is sometimes vehicle specific, so check your owners manual or it maybe even be on a sticker on the filler neck.
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Old 12-06-2010, 06:31 AM   #10
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Heat only works when driving - '05 Elantra


I did buy some and fill it, it wasn't as low as I thought. Used maybe 1/8 gallon to get fill it.

In any case, didn't fix the problem....
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Old 12-06-2010, 09:45 AM   #11
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Heat only works when driving - '05 Elantra


How long have you owned this car and has it ever overheated? Possible head gasket blown.
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Old 12-06-2010, 10:13 AM   #12
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Heat only works when driving - '05 Elantra


I bought it new, never overheated before.

I also realized, after talking to someone at work, that filling the overflow tank with coolant doesn't do much....I didn't know enough to fill the radiator directly (after letting the car cool down).

I'll be doing that tonight.

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