mikael7744

dh53

I haven't done this job myself but according to my shop manual and what I read here the dashboard has to come out. Some posts say the windshield needs to come out to get the dash out. It is certainly a big, expensive job.

I would definitely flush the heater core with some CLR to see if that clears any clogs before taking the dash apart. I recently had very little heat and suspected the heater core but when I flushed it the water flowed in both directions with no problem so I moved on. The culprit in my case was the flap actuator that switches between fresh air and recirc somehow failed in a way that mostly closed off both. I forced the door flap into the recirc position and I now have heat.

mikael7744

OK, changed the heater core in my TT and the heat is now luke warm, the 2 vents in the middle push out weak heat and the 2 on the side is pushing out could air, about 20 min of driving then it gets hot WTF

Mister Bally

Standard automotive troubleshooting techniques apply for this scenario. You may have to learn them if you don't know them. Or pay someone who does. The service manual is a great start.