1.8T - not blowing hot
Thread Starter
AudiWorld Senior Member
Joined: Jan 2010
Posts: 1,668
Likes: 16
From: Brighton, MI
1.8T - not blowing hot
Not getting hot air from HVAC/climate heater.
Also sometime coolant temp gauge goes to 'cold' from middle.
Found:
01039 - Coolant Temperature Sensor (G2)
30-00 - Open or Short to Plus
Replaced G2 sensor (G62 also in there IIRC).
Gauge showing properly.
Heater still blowing cold.
Heater core was flushed not too long ago.
Timing belt with water pump done not too long ago.
'burbed' the heater hose with the white dot at firewall (did not seem air coming out).
Any suggestions for further troubleshooting?
Also sometime coolant temp gauge goes to 'cold' from middle.
Found:
01039 - Coolant Temperature Sensor (G2)
30-00 - Open or Short to Plus
Replaced G2 sensor (G62 also in there IIRC).
Gauge showing properly.
Heater still blowing cold.
Heater core was flushed not too long ago.
Timing belt with water pump done not too long ago.
'burbed' the heater hose with the white dot at firewall (did not seem air coming out).
Any suggestions for further troubleshooting?
AudiWorld Super User
Joined: Feb 2010
Posts: 3,066
Likes: 37
From: Fort Worth, Tx
My 2 cents: replace the heater core. You didn't put the mileage, but I also flushed a heater core with no results on a car with over 200K miles. Ended up replacing the heater core and immediately fixed the problem. The issue is unless you are meticulous and change your coolant every 2 years or so or do not know the history, the particles in the coolant will clog the heater core and flushing won't help. When I pulled my core, it is obvious Audi minimized the size by creating a core with very small passages.
AudiWorld Super User
Joined: Feb 2010
Posts: 3,066
Likes: 37
From: Fort Worth, Tx
I have heard that can work, but never tried. I am always nervous adding fluids / chemicals in a system that I can't completely flush out and what the impact of those chemicals have on other components, like the water pump in this case. If the core was easy to remove and you could soak it for a while and then flush well before reinstalling, then okay. But if you go that far, might as well replace as I think they are fairly inexpensive and time is money...
edit: that is a horrible run-on sentence...
edit: that is a horrible run-on sentence...
Thread Starter
AudiWorld Senior Member
Joined: Jan 2010
Posts: 1,668
Likes: 16
From: Brighton, MI
Would need plenty of confirmed first hand experience before trying it.
AudiWorld Super User
Joined: Aug 2011
Posts: 2,369
Likes: 7
From: Washington
Core is bad. Flushing will not cure it in most cases.And mileage isnt always a factor. I just did a core awhile ago with only 90k miles and well maintained. Its just a rather poor core design that packs full of debris and isnt possible to fully flush.
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