KrisDC2

I've flushed the heater core several times with hot water through the inlet and outlet. Used CLR and let it sit in the core for 20 minutes then flushed again both ways and used compressed air both ways. Flushed with clean water and air and each time, both ways the water flows hard and strong with a full stream of water. There is definitely no blocks in the heater core.

The temperature control flap motor (pink lever) works as it should.

Where re is the heater control valve located? Is it under the windshield cowl behind the firewall?

Any other ideas???

Mister Bally

Use service manual for component identification and proper troubleshooting techniques.

Purchase if you don't already have.

KrisDC2

If you have a manual would you mind helping me out and telling me where it is.

Mister Bally

The manual is on a computer that is 600 miles away from me. Sorry.

Best to have your own in order to work on these vehicles. I buy them as soon as I buy a car. My son got his TT about four years ago; As soon as he bought it, he ordered the manual (on CD-Rom) From Bentley Publishers for installation on our garage computer. It paid for itself within the first month. Now it has paid for itself a hundred-fold as he replaced his clutch and then later rebuilt a replacement engine. R & R'd the engine which not a simple task on this vehicle. Then a steering rack replacement, Headlight issues, cooling system work, brake system repairs and the beat goes on....

bailee

Did you replace the thermostat? Very inexpensive but critical to your issue.

KrisDC2

Yes I replaced it a year ago and have bled the system, flushed the heater core on two separate occasions.

Unless the thermostat is faulty but the car comes up to operating temperature like normal.