Fixed heater: Flush and temp sensor replaced, a couple of tips....
10-10-2013, 03:31 PM
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Fixed heater: Flush and temp sensor replaced, a couple of tips....
Hi all,
I was having the (what seems like) common issues of no heat and sporadic temp gauge on my 2001 S4. After reading the tech article and talking with my local shop, I flushed the heater core and replaced the temp sensor (with updated green unit). The tech article was spot on and I would add the following as per my shop and my own experience:
*Make sure you get 7/8" INTERIOR DIAMETER hose! I bought O.D. and it was a P.I.T.A to get on the core inlet/outlet! The heat gun and a small screwdriver made it work, but it was close!
*A brass barbed female garden hose fitting made hooking up the hose a snap and I used an inline ball valve to control flow (so I didn't have to be at the faucet).
*I ran some CLR solution (for cleaning lime scale, etc) at a 50/50 ratio into the core and let it sit for 40min or so (shop recommendation).
*The temp sensor was super easy, but have a new clip ready. At 13 years old, those plastic clips break if you look at them hard! I re-inserted the broken pieces and was able to get to the dealer for a replacement with no issues.
When I flushed the heater core, surprisingly the water came out crystal clear (after flushing the pink coolant and CLR out)! Very little rust/debris.
So I'm assuming the heater culprit was the sensor, as now I have *HEAT* and my gauge is back to normal.
Cheers,
E.
I was having the (what seems like) common issues of no heat and sporadic temp gauge on my 2001 S4. After reading the tech article and talking with my local shop, I flushed the heater core and replaced the temp sensor (with updated green unit). The tech article was spot on and I would add the following as per my shop and my own experience:
*Make sure you get 7/8" INTERIOR DIAMETER hose! I bought O.D. and it was a P.I.T.A to get on the core inlet/outlet! The heat gun and a small screwdriver made it work, but it was close!
*A brass barbed female garden hose fitting made hooking up the hose a snap and I used an inline ball valve to control flow (so I didn't have to be at the faucet).
*I ran some CLR solution (for cleaning lime scale, etc) at a 50/50 ratio into the core and let it sit for 40min or so (shop recommendation).
*The temp sensor was super easy, but have a new clip ready. At 13 years old, those plastic clips break if you look at them hard! I re-inserted the broken pieces and was able to get to the dealer for a replacement with no issues.
When I flushed the heater core, surprisingly the water came out crystal clear (after flushing the pink coolant and CLR out)! Very little rust/debris.
So I'm assuming the heater culprit was the sensor, as now I have *HEAT* and my gauge is back to normal.
Cheers,
E.
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