Hi audifan and all...Any cleaner now?
Hi audifan,Are you still having issues? How did the cleaning go?
Thanks Spike and I bow to anyone's superior knowledge...Just to reinforce Simon's comments, the brown sludge may have been caused by mixing the old type glycol based antifreeze with Audis 'OAT' based G12 / G13
I knew they weren't compatible but was surprised just how bad it can be over time. This is just one of the answers I found with a random search -
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Cheers Spike
Well because the weather is supposed to be so cold tonight i thought I'd remove the bottom hose on the rad and this is what i found... View attachment 47459View attachment 47460
Diagram of coolant hose connections |
1 - | Exhaust gas recirculation cooler or auxiliary heater |
q | Exhaust gas recirculation cooler is only fitted on engines with code letters ATL |
q | Fitting of auxiliary heater depends on equipment level |
2 - | Bleeder screw |
3 - | Coolant pipe |
4 - | Heat exchanger |
q | If renewed, refill system with fresh coolant |
5 - | Coolant pipe |
6 - | Coolant expansion tank |
q | With filler cap |
q | Checking pressure relief valve in filler cap → Anchor |
7 - | Coolant hose |
8 - | Bleeder screw |
9 - | Radiator |
q | Removing and installing → Chapter |
q | If renewed, refill system with fresh coolant |
10 - | Coolant hose |
11 - | Oil cooler |
q | If renewed, refill system with fresh coolant |
q | Removing and installing → Chapter „Removing and installing oil filter bracket“ |
12 - | Coolant pump/thermostat |
q | Removing and installing coolant pump → Chapter |
q | Checking thermostat → Chapter |
q | Removing and installing thermostat → Chapter |
13 - | Cylinder head/cylinder block |
q | If renewed, refill system with fresh coolant |
14 - | Coolant pipe |
q | Going to heat exchanger on vehicles without exhaust gas recirculation cooler or auxiliary heater |
15 - | Coolant pipe |
q | To exhaust gas recirculation cooler or auxiliary heater |
Nice idea Simon.. Cheers...What about getting a sample of some of the goo in a beaker and seeing what will break it down - hot water / detergent / engine degreaser....
Simon.
That's what I've been doing Spike.. I'm now trying a little Swarfega as my thinking is if it's good enough for my hands then how bad can it be in the cooling system...Drastic measures but how about removing the thermostat from the housing then doing the hosepipe flush as suggested earlier.
That way you should get a more complete 'flow' round the engine which should dislodge more of the gunge
I've not checked how accessible the flow and return hoses to the heater matrix are, but maybe it's possible to flush that separately
Cheers Spike