While we are on after-run coolant pumps...switching back to standard temp sensor
11-15-2006, 10:20 PM
#1
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While we are on after-run coolant pumps...switching back to standard temp sensor
so mine leaks as well. if i switch back to the standard temp sensor and not the low temp, will it still leak? how exactly does the pump work?
11-15-2006, 10:31 PM
#2
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The pump will still leak, it's part of the pressurized system. The pump operates using a magnetic
impeller that circulates the coolant through the turbos and cylinder heads.
Electrical coolant circulation pump V51
Electrical coolant circulation pump V51 is
located in the engine's V angle.
If the coolant temperature is too high,
thermoswitch for coolant circulation run-on
F95 activates the additional coolant function.
The high temperatures which occur at the
exhaust gas turbocharger produce vapour
bubbles which prevent coolant being drawn in
by pump V51.
When pump V51 starts up, the coolant flows
through the exhaust gas turbocharger and the
cylinder heads. The direction of flow in the
turbocharger cooling circuit is reversed by
this.
Due to this reversal of the direction of coolant
flow, coolant is drawn in via the cylinder heads
(large cross-sections), which means that any
vapour bubbles which develop are expelled
from the exhaust gas turbocharger lines.
The electrical coolant circulation pump again
draws in coolant along the rear coolant pipe,
thereby recirculating the coolant.
Bottom-Line: You're going to have to change it if it leaks.
Electrical coolant circulation pump V51
Electrical coolant circulation pump V51 is
located in the engine's V angle.
If the coolant temperature is too high,
thermoswitch for coolant circulation run-on
F95 activates the additional coolant function.
The high temperatures which occur at the
exhaust gas turbocharger produce vapour
bubbles which prevent coolant being drawn in
by pump V51.
When pump V51 starts up, the coolant flows
through the exhaust gas turbocharger and the
cylinder heads. The direction of flow in the
turbocharger cooling circuit is reversed by
this.
Due to this reversal of the direction of coolant
flow, coolant is drawn in via the cylinder heads
(large cross-sections), which means that any
vapour bubbles which develop are expelled
from the exhaust gas turbocharger lines.
The electrical coolant circulation pump again
draws in coolant along the rear coolant pipe,
thereby recirculating the coolant.
Bottom-Line: You're going to have to change it if it leaks.
11-15-2006, 11:04 PM
#4
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Thanks! BTW, you can change the pump w/o removing the manifold
if you have a 6speed. Pretty sure it's in EdyJun's directory. If not, shoot me an e-mail and I can walk you through it (already did it and replaced pump with 90* elbow), took 10 minutes.
11-16-2006, 06:42 AM
#7
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There is no write up per se....
I can't remember the ID of the hose....I think it's like a 3/8" 90* heater hose elbow. You can pick them up at Pep Boys in the "Help!" products section. I'd buy a variety of sizes just to be sure. Also hose clamps, it'll make your life easier. And yes you can leave the connector unplugged and not throw a CEL.
Oh, and...<ul><li><a href="https://forums.audiworld.com/s4/msgs/2169710.phtml">Follow this (from davenew)</a></li></ul>
Oh, and...<ul><li><a href="https://forums.audiworld.com/s4/msgs/2169710.phtml">Follow this (from davenew)</a></li></ul>
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11-16-2006, 09:23 AM
#8
More accurately the TSB is for relocation of the aux pump and replacement in orig location w/ 90 deg
elbow hose. There is also a kit that Audi sells for this fix - which is what you would get if this is fixed under warranty.
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