Heater Core Flush - Kind of Funny
10-09-2014, 09:20 PM
#11
AudiWorld Member
Working temperature
I followed the good advice of countless posters and hooked some tubing to the inlet and outlet ports of my heater core. Garden hose on one end, draining in to a bucket on the other.
A little coolant came out (probably .5L or less) then just clear water. Hmmm...where's all the gunk and crap that everyone's been finding?
Okay, step two. Emptied a half bottle of CLR into the heater core, diluted it with a bit of water. Washed the motorcycle quickly, then flushed the heater core.
Hmmm...still clear?
Weird. In goes the second half of the bottle of CLR. Waited 10 minutes. Flushed. Same (clear) result.
The point is, I was assuming that my core was gummed up because when it's cold outside (below -15C) I don't get heat at idle, only at ~2000RPM or above. So now I am waiting until it gets cold again to see if (miraculously) this procedure (with no noticeable result) has fixed it.
Finally, so this isn't a completely wasted thread, here is one of the links I referenced:
https://www.audiworld.com/forums/a4-...w-pics-349252/
A little coolant came out (probably .5L or less) then just clear water. Hmmm...where's all the gunk and crap that everyone's been finding?
Okay, step two. Emptied a half bottle of CLR into the heater core, diluted it with a bit of water. Washed the motorcycle quickly, then flushed the heater core.
Hmmm...still clear?
Weird. In goes the second half of the bottle of CLR. Waited 10 minutes. Flushed. Same (clear) result.The point is, I was assuming that my core was gummed up because when it's cold outside (below -15C) I don't get heat at idle, only at ~2000RPM or above. So now I am waiting until it gets cold again to see if (miraculously) this procedure (with no noticeable result) has fixed it.
Finally, so this isn't a completely wasted thread, here is one of the links I referenced:
https://www.audiworld.com/forums/a4-...w-pics-349252/
Is the car engin coolent comes to a working temperature in a reasonable time? Check the heater core pipe entry and exit if they are at the same temperature
10-10-2014, 05:38 AM
#12
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Try bleeding the system by opening the bleeder screw (I think it's a 5mm allen head) in the hose in the middle of the engine Y near the front. Run engine with heater on, open screw till fluid runs out, close screw, repeat as needed (keep engine running/opening/closing screw) until you get heat at idle.
11-28-2014, 10:23 AM
#13
AudiWorld Member
Thread Starter
stripped screw...
Found it with your help, thank you. I loosened it too much and stripped it a tiny bit reinstalling it (working in the near dark at -30 will do that...) going to try and clear the threads this afternoon (still -30, but not as dark).
12-07-2014, 09:56 AM
#14
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I had the same problem. Bleed the system with no results. Took it to a shop and they flushed it with CLR. That made it better, Giving me about 80% heat back. The shop told me I would have to replace the heater core in about a year. Hope that helps a little.
Last edited by mtnsearch; 12-07-2014 at 09:58 AM. Reason: grammer
12-07-2014, 12:13 PM
#15
Reverse the lines going to the heater core. Move upper hose to lower and lower to upper. I don't know why it works, but it does.
My AR used to have no heat then would have ok heat after core flush. I reversed the lines and I get great heat, even at idle. I still have to flush the core every winter, but heat is great after that till next winter when next flush is needed.
My AR used to have no heat then would have ok heat after core flush. I reversed the lines and I get great heat, even at idle. I still have to flush the core every winter, but heat is great after that till next winter when next flush is needed.
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