Well I am almost at the end of my 2 month project of rebuilding the engine in my "Free" 2001 Passat. The engine is running, but one of the other problems in the car when my sister in law had it was it had no heat. I read the thread "No Heat Blues" and tried that yesterday. After 2 treatments of CLR I had lukewarm heat. I came back and did more research and came across this tool
OTC 6043 Blast-Vac Multipurpose Cleaning Gun : Amazon.com : Automotive
Looks great however I have already spent enough on parts and tools, but the concept looked plausible, so I took what I had and made my own.
I has this stuff already so I assembled as shown in the pic and tried it. The water was running clear thru the heater core. I set the regulator at 35 lbs and hit the air. The water immediately went brown and all kinds of crap came out. After 1 more soaking with CRL & a good flushing with air/water & then water the heat will now burn the hair off your knuckles on high. :wrench::wrench::driving:
Just thought i would share for anyone else having this problem
OTC 6043 Blast-Vac Multipurpose Cleaning Gun : Amazon.com : Automotive
Looks great however I have already spent enough on parts and tools, but the concept looked plausible, so I took what I had and made my own.
- 1 foot of 3/4 heater hose
- 4 inches 3/4 heater hose
- Flush kit "T" for 3/4 hose
- Air Blow Gun
- Air Pressure regulator (not shown)

I has this stuff already so I assembled as shown in the pic and tried it. The water was running clear thru the heater core. I set the regulator at 35 lbs and hit the air. The water immediately went brown and all kinds of crap came out. After 1 more soaking with CRL & a good flushing with air/water & then water the heat will now burn the hair off your knuckles on high. :wrench::wrench::driving:
Just thought i would share for anyone else having this problem