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post #1 of 15 (permalink) Old 10-11-2009, 09:09 AM Thread Starter
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Overheating car - tried everything

After having the waterpump in my car replaced, along with the radiator temp sensor, thermostate with housing and "both temp sensors" and the fan relay control unit, my car is STILL overheating.

Is there anything else left to replace? When the dashboard water gauge is on just over 110, code 51 on the climate control shows 66 degrees. When I then set code 49 on the climate control, it says 82 degrees. This corroborates what the garage said, that there's a difference of 30 degrees roughly.

The fans don't come on, and when I do get them on using AC blasting out, the temperature didn't seem to stop rising on the dash when I rev the car a little.

Here's a pic of what looks like it's been replaced, I've heard the temperature sender is a relatively common fault, but it looks like it's been replaced? Do you think from the pic the sender has been replaced?

Could anyone please give me any advice as I don't want to take it to Audi for about £500 if I can do it myself. This is driving me mad. I'd really really appreciate any advice that can help me get to the bottom of this.



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post #2 of 15 (permalink) Old 10-12-2009, 04:25 AM
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Is the car actually overheating or is it a faulty dash unit shame you cant swap dash units as they are imob coded.

I take it you have checked for headgasket failure?

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post #3 of 15 (permalink) Old 10-13-2009, 03:56 AM Thread Starter
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How can I check for a headgasket failure? Two separate garages said the there wasn't any HG issues.

I don't know if the car is overheating or it's a faulty dash unit, that's what I'm beginning to think, which temperature reading should I pay attention to? The dash, code 49, or code 51? The thing is, if I sit and rev the car from cold, to about 3k RPM, for about 2 or 3 minutes, it's going to 110 degrees on the dash, but the water is pumping around in the coolant tank.

Any other ideas?

Thanks
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post #4 of 15 (permalink) Old 10-13-2009, 04:17 AM
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Well I would guess the garages would be looking for trade thus you prob havent got headgasket problem. Sender or airlock. Or the crap french made dash

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post #5 of 15 (permalink) Old 10-13-2009, 04:55 PM Thread Starter
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Is the sender separate to the thermostat? Would you know where can I locate the sensor in relation to those pictures as I can't find any guides on replacing the sender, on the thermostat.

Thanks again for the help
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post #6 of 15 (permalink) Old 10-13-2009, 05:17 PM
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That the green one im taking about Ive had one fail under a year old. Im guessing your 1.6 is a 2001 - 2003 car ? AVU,BFQ engine

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post #7 of 15 (permalink) Old 10-13-2009, 05:19 PM
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You pull the large clip back and off then pull sensor up. Replace oring & clip as the sometimes go weak and break.

What engine code ?

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post #8 of 15 (permalink) Old 10-14-2009, 03:20 AM Thread Starter
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I'm not sure what engine code it is, as the car is in a lock up at the moment so I can't check til the weekend probably. So is the green thing the sender or thermostat? I'll look into getting a new o-ring and clip.

Thanks again
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post #9 of 15 (permalink) Old 10-14-2009, 04:24 AM
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Sender/sensor is green. Maybe try and find a VAG specialist in your area other than audi. Are you getting hot air from cabin heater?

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post #10 of 15 (permalink) Old 10-14-2009, 04:45 PM Thread Starter
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I've now learnt it's not an airlock, as the garage bled the system and tried to remove any airlocks.

The garage in fact did both the sender and thermostat when they did the waterpump too. The problem now seems to be that the fans don't come on when the dash gauge gets over 90. The thing I don't get is that the fans work when I turn the AC on, but it still doesn't cool the engine down at all.

Is there some sort of controller to make the waterpump go faster that could be faulty, or some sort of switch that triggers the fans when the car engine gets hot? Can anyone offer any other suggestions? This is driving me insane.

Thanks very much
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