1993 Audi UrS4 Heater Core “Quick”Replacement Method

Описание: After 29 years the stock heater core in my pearl '93 S4 finally started to leak. I credit this impressive lifespan to my regular coolant exchanges and my insistence on using the coolant with a distilled water mix.

Rather than jumping into the replacement blindly, I of course turned to the FAQ at Quattroworld as I knew the replacement process had been pretty well documented over there. Here is a link to the instructional PDF I used:
https://www.audiworld.com/forums/atta...

Mahle / Behr Heater Core - https://www.autohausaz.com/pn/BH-4438...
Audi OE Heater Control Valve - https://spareto.com/products/volkswag...
Aftermarket Heater Control Valve - https://www.autohausaz.com/pn/4A0819809
Permatex Ultra Gray RTV - https://amzn.to/3nIxcgE
If you don't want to silicone your heater box in, the part number for the OE foam gasket matches this inner door beam gasket - https://www.ecstuning.com/b-genuine-v...

The billet aluminum cooling system parts shown were sourced from EFI Express.

Thermostat housing - https://shop.efi-motorsport.com/colle...
Coolant Flange at rear of engine - https://shop.efi-motorsport.com/colle...
Billet coolant tee - https://shop.efi-motorsport.com/produ...

Any other questions? Just let me know in the comments!