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Pages: 1 Mark Hanman Reged: 10/09/2010 Posts: 282 Loc: Costa del Poole Overheating ABH [re: ]       06/09/2014 23:26 Edit   Reply   It's started overheating in slow traffic, around town, stop start motoring. The electric cooling fan is not starting on any speed, but does run if powered up by another source. I'm thinking of running a switched line as a stop gap. Once moving at a decent pace, 50mph/80kph, it returns to a normal running temperature fairly quickly. From a normal start, the car is warming up sensibly. Heater system appears to pass warm air as expected during warm up. UK car. Was running fine, no gradual getting worse symptoms. It just got hot one day, on a journey I had done a hundred times. Any suggestion regarding specific items, before I allocate a bunch of time to work out where all the circuits run? Should it be possible to run the fan via the diagnostics cable? 85 WR quattro 90 V8 Silver, 91 V8 Black, 93 V8 Lago 93 100e quattro V6. Titan, i think Post Extras:       Roy F Reged: 06/05/2006 Posts: 21669 Loc: Schweiz Re: Overheating ABH [re: Mark Hanman]       07/09/2014 02:12 Attachment (1564 downloads) Edit   Reply   In Antwort auf: Should it be possible to run the fan via the diagnostics cable? No. You can try to unplug the connectors on the temperatursensors, watch attachment, german but I think you understand what it means Gruess Roy http://roy-fuchs.smugmug.com/ Post Extras:       Tim A. Reged: 05/08/2003 Posts: 1991 Loc: Schleswig Holstein Re: Overheating ABH [re: Mark Hanman]       07/09/2014 09:50 Edit   Reply   Also check the viscous clutch of the cooling fan, driven by the belt. At hot engine it needs to stop reving nearly simultaneously withe the engine, when you shut it down. And at hot conditions the clutch needs to feel tight (but not completely solid), when you spin it by your hands. At cold engine id needs to be rotatable with just one finger. Beste Grüße Tim Post Extras:       Mark Hanman Reged: 10/09/2010 Posts: 282 Loc: Costa del Poole Re: Overheating ABH [re: Tim A.]       11/09/2014 19:20 Edit   Reply   I guess the clutch is, for want of a better word, Kaput. Hot; engine off, by a flick of the fingers, it rotates by maybe 2/3 fan blades. But, it also spins freely sometimes. Cold; it rotates 2/3 fan blades, but never freely. Engine running, it appears to be constantly spinning. Now, I need to understand why the electric cooling fan is not doing it's job. I'm hoping to swap the engine, but there is little point in putting a good engine in with faults. 85 WR quattro 90 V8 Silver, 91 V8 Black, 93 V8 Lago 93 100e quattro V6. Titan, i think Post Extras:       Tim A. Reged: 05/08/2003 Posts: 1991 Loc: Schleswig Holstein Re: Overheating ABH [re: Mark Hanman]       11/09/2014 20:19 Edit   Reply   Yes the clutch is worn (kaputt ) You need to replace it. Mind the left hand thread of the central nut. The malfunction of the aux fan is another bug, but not depending on the viscous clutch. Beste Grüße Tim Post Extras:       Mark Hanman Reged: 10/09/2010 Posts: 282 Loc: Costa del Poole Re: Overheating ABH [re: Tim A.]       12/09/2014 12:28 Edit   Reply   i'm beginning to suspect the upper temp sensor, but my thinking may be flawed. once i have the rad sensor exposed, i can hopefully prove the temp sense circuits. 85 WR quattro 90 V8 Silver, 91 V8 Black, 93 V8 Lago 93 100e quattro V6. Titan, i think Post Extras:       Mark Hanman Reged: 10/09/2010 Posts: 282 Loc: Costa del Poole I think the heap hates me. [re: Mark Hanman]       12/09/2014 22:32 Edit   Reply   Cooling fan replaced; or rather the clutch. The fan by default, as I had a spare in the stock pile. Result. Temperature under control, for now. But it's an old clutch, too. So I'll order a new one. Now, it's having an issue revving above 1600rpm. Generally fine, pulling away gently. Once moving, if I accelerate hard, it has a minor hiccup at about 1600rpm. If moving slowly, and accelerating gently, it is quite obviously being limited at 1600rpm. If I rev the engine when stationary, gearbox in N or P, then it also has a very obvious restriction. 85 WR quattro 90 V8 Silver, 91 V8 Black, 93 V8 Lago 93 100e quattro V6. Titan, i think Post Extras:       Bastian P. Reged: 18/08/2002 Posts: 13274 Loc: Österreich (Graz) Re: I think the heap hates me. [re: Mark Hanman]       13/09/2014 11:44 Edit   Reply   Any ECU faults stored? Could be a sensor issue... Das Buch zum Audi V8 Post Extras:       Mark Hanman Reged: 10/09/2010 Posts: 282 Loc: Costa del Poole Re: I think the heap hates me. [re: Bastian P.]       13/09/2014 16:19 Edit   Reply   I think a separate thread is called for. What this (next) space. 85 WR quattro 90 V8 Silver, 91 V8 Black, 93 V8 Lago 93 100e quattro V6. Titan, i think Post Extras:       Pages: 1

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