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  #1 (permalink)  
Old 01-11-2010, 03:11 PM
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Default Heater blowing cold air

My car has started blowing colder air when I am idling and warms back up after I start driving. Any ideas?
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Old 01-11-2010, 04:15 PM
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Off the top of my head, worst case scenario, a bad water pump or a stuck thermostat or perhaps it is just low on coolant.
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Old 01-11-2010, 04:18 PM
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Thanks!
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Old 01-11-2010, 04:20 PM
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Originally Posted by D2Beetle View Post
Off the top of my head, worst case scenario, a bad water pump or a stuck thermostat or perhaps it is just low on coolant.
yup, any one of those three... or by chance it might be the temp sensor...
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Old 01-11-2010, 06:37 PM
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Quote:
Originally Posted by turbos03 View Post
yup, any one of those three... or by chance it might be the temp sensor...
A faulty temp sensor will not affect the heat output. My money would be on the thermostat. They often will open too early or stay stuck in the open position as that is how they are designed to fail.
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Old 01-11-2010, 07:44 PM
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Would that also make the temp light flash and beep at me?maybe those things are related?
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Old 01-11-2010, 08:41 PM
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Default Red temp light flashing...

The flashing red temp. light normally indicates a low coolant condition. Have you checked the coolant reservoir?? It should be at the max mark when your engine is completely cooled off. It should read at the min mark when the engine is completely warmed up. Below the min mark when hot means it needs more coolant in it. Your temp sensor is working just fine, it's your coolant level that is probably too low for your water pump to circulate it through the heater coils at idle. If your car is not over heating than your water pump is probably alright but you do need to check and top off your coolant system with VW's G-12 coolant or what ever is called for for your years model. Have you had the cooling system worked on recently and then re-filled?? If so, it's possible that they did not re-fill it completely. Air can get trapped in the cooling system if it's re-filled without giving it enough time to completely fill up. The engine has to be warmed up and run at a high idle so the coolant can circulate and remove all the trapped air. Check for leaks and that tell tale anti-freeze smell when your car is warmed up. Good luck with this, JK
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Old 01-12-2010, 05:36 PM
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Thanks,coolant level is fine, taking it in on Thursday.
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Old 01-12-2010, 06:58 PM
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Have you had your timing belt/water pump replaced?
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Old 01-12-2010, 09:08 PM
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Have you had your timing belt/water pump replaced?
It's an '06, so a 2.5L--no TB.

Wasn't there an issue w/ heat in the early 2.5L NBs?--I think I remember hearing something about that? Mighta even been a TSB put out IIRC.
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Old 01-25-2010, 08:35 PM
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They said it was temp sensor and that the light and the cold blowing air were both from that. Only 1800 miles of my warranty left. They have to order the part so I have to take it back in a few days. Also got a coil recall letter on Saturday and had that taken care of.
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Old 01-25-2010, 09:37 PM
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Quote:
Originally Posted by shellbug View Post
They said it was temp sensor and that the light and the cold blowing air were both from that. Only 1800 miles of my warranty left. They have to order the part so I have to take it back in a few days. Also got a coil recall letter on Saturday and had that taken care of.
like I said, temp sensor... good news and glad it was nothing serious...

you're welcome..

Last edited by turbos03; 01-25-2010 at 09:43 PM..
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Old 01-26-2010, 02:17 PM
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Glad to hear your problem was solved and still under warranty.
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Old 01-26-2010, 09:08 PM
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Default Temp sensor...

Can anyone explain the relationship of the faulty temp. sensor and her heater that would not put out warm air??? I can understand the red temp. light coming on but the heater??? Anyone??? JK
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Old 01-26-2010, 09:35 PM
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Old 01-28-2010, 02:20 AM
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Quote:
Originally Posted by turbos03 View Post
like I said, temp sensor... good news and glad it was nothing serious...

you're welcome..
You are my hero!!
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Old 01-28-2010, 12:43 PM
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Quote:
Originally Posted by Turbomania View Post
Can anyone explain the relationship of the faulty temp. sensor and her heater that would not put out warm air??? I can understand the red temp. light coming on but the heater??? Anyone??? JK
because its a VW....

Last edited by turbos03; 01-28-2010 at 12:50 PM..
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Old 01-28-2010, 12:44 PM
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Originally Posted by shellbug View Post
You are my hero!!
just glad I could help.... same thing happened to a buddies MK4 Gti couple of years back and after changing the water pump and thermostat the only thing left was the temp sensor... swapped it out and bingo, heat... all that work for nothing..
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