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Heater blowing cold air

Tiny
ARGJEND
  • MEMBER
  • 2009 VOLKSWAGEN E-GOLF
  • 4.5L
  • 4 CYL
  • TURBO
  • MANUAL
  • 130,000 MILES
Last year I changed the interior radiator of my car because it only blew cold, after I changed it, it started to blow hot, but near this year it blows cold. What is your advice?
Wednesday, December 8th, 2021 AT 2:45 AM

11 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The old heater core may have been clogged with debris. When you replaced it, the core worked for a while until the debris clogged the new core.

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

I would remove the two hoses to the heater core and flush the core with a garden hose. Flush it back and forth several times until you get a nice even flow in both directions.

Then hook it back up, top off the coolant, and test.

Roy
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Wednesday, December 8th, 2021 AT 3:47 AM
Tiny
ARGJEND
  • MEMBER
  • 6 POSTS
Is necessary to change radiator or not? Also, I wanted to ask you if flap motor is not working good.
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Wednesday, December 8th, 2021 AT 3:57 AM
Tiny
ASEMASTER6371
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I would flush the system of all old coolants and replace it. At this point, no, I don't see any reason to replace the radiator.

As far as the blend door, when you command heat and cold, can you hear the door move in the dash? If you have a cable, is it hooked on both ends?

Roy
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Wednesday, December 8th, 2021 AT 4:33 AM
Tiny
ARGJEND
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  • 6 POSTS
At driver side blows hot at other side blow cold, flap motor is working but I don't know if it is closing good blend door.
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Wednesday, December 8th, 2021 AT 4:37 AM
Tiny
ASEMASTER6371
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This sounds like the blend door actuator itself. Try feeling it move and make sure the sweep is correct.

https://www.2carpros.com/articles/replace-blend-door-motor

I would still blow out the heater core.

Can I have the complete VIN number for your car?

Roy

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Wednesday, December 8th, 2021 AT 5:28 AM
Tiny
ARGJEND
  • MEMBER
  • 6 POSTS
Roy, can you send me your what's up or Facebook?
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Wednesday, December 8th, 2021 AT 5:29 AM
Tiny
ASEMASTER6371
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We need to communicate on this site.

Roy
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Wednesday, December 8th, 2021 AT 5:34 AM
Tiny
ARGJEND
  • MEMBER
  • 6 POSTS
At summer my car blows more hot when is winter starts to blow cold.
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Wednesday, December 8th, 2021 AT 5:37 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, you have to start somewhere, and I would start by flushing the core as I suggested.

Roy
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Wednesday, December 8th, 2021 AT 5:49 AM
Tiny
ARGJEND
  • MEMBER
  • 6 POSTS
Is there a golf tube MK6 to empty the antifreeze?
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Wednesday, December 8th, 2021 AT 5:58 AM
Tiny
ASEMASTER6371
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There should be a drain plug at the bottom of the radiator for removing the coolant.

If there is not, then remove the lower radiator hose to remove the coolant.

Roy
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Wednesday, December 8th, 2021 AT 6:05 AM

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