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Old 04-15-2007   #1
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Coolant overheating Issue

Hi, we have a 2003 V10 TDI (UK spec) and have just developed a coolant overheating problem. On removing the expansion cap the fluid looked low, so topped up with water - which took 1/4 - 1/2 pint. Now to me that seems weird for a car thats just overheated. I ran the engine hoping to see any airlocks rise into the tank - no such luck. So where the do I bleed the system?
Plus I thought was water splashes on the OSF wheel arch, shock etc, on closer inspection I think it may be fresh oil splashes - not good I guess.

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Old 09-09-2010   #2
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My car is having a coolant overheating issue too. Did you find out what the problem is.

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Old 09-09-2010   #3
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this thread is from 07 and he only had one post.
start with the electric water pump. Thermostat(if these engiens have one since they have an elec wp).

flushing the system cant hurt.
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Old 09-12-2010   #4
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It could be your thermostat... You'd have to start with a cool engine, and start her up, and feel the coolant hoses that feed the thermostat at the front of the engine... the problem is, it takes 10 years for the v10 to warm up if you only idle it from cold, so it's hard to tell if the thermostat opens up and flows coolant.

So your symptoms are: The temperature guage climbs to the red or close to it?

Do your heat vents blow hot when you turn up the temperature?

Little more info is needed!
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Old 09-13-2010   #5
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Engine Coolant Overheating

My 2004 Touareg just had the Engine Coolant Overheating warning light came on.... Coolant level seems fine. Bought the T-Reg with 80K miles and haven't done anything coolant related since. I'm now approaching 93K miles. Any recommendations on how to proceed? Thanks!
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Old 09-13-2010   #6
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You need to determine if your thermostat is stuck closed... Which it sounds like... If your coolant is bubbling when you open your resevour, perhaps it is not stuck closed, and could be a head gasket(s)? There is a dye that the dealer can drop in a sample of your coolant to tell if your exhaust gasses are leaking into your coolant, or, the reverse is, if your coolant is leaking into your combustion chamber, you have white smoke.

The problem I had was, my thermostat was stuck open... Sounds like yours could be stuck closed.

2nd scenario (probably more likely than your thermostat) is that your water pump has failed.

Let us know what you find.
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Old 09-13-2010   #7
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[QUOTE=v10treg;228902]You need to determine if your thermostat is stuck closed... Which it sounds like... If your coolant is bubbling when you open your resevour, perhaps it is not stuck closed, and could be a head gasket(s)?

So check the reservoir after I've the had the car running? If not bubbling, then the thermostat is stuck closed? Any way to access the thermostat?
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Old 09-13-2010   #8
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Search our Technical Forum... I have no guarantees it indeed IS the thermostat, but it sounds like it. I presume your timing belt was changed as per Maintenance? Any record of Water Pump change (for the fun of it)? It very well could be your water pump as well...
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Old 09-14-2010   #9
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Sorry about the vague description.... I don't know what any of these parts are. See the attached picture. Looks like these two plastic levers are broken. Looks they lead into some sort of vacuum control valves.... Do these have anything to do with my overheating issue?
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Old 09-14-2010   #10
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Quote:
Originally Posted by ROCKIN ROLLER View Post
Sorry about the vague description.... I don't know what any of these parts are. See the attached picture. Looks like these two plastic levers are broken. Looks they lead into some sort of vacuum control valves.... Do these have anything to do with my overheating issue?
I do not know if this is related to the heating/cooling.

But the good news is that this is very common and there are some vendors that have made metal replacement parts. I believe these control the throttle body.

I believe that this is more common on the V8 and even the Audi A8 4.2 (as it has the same block).

I am sure that other people on this forum have more details.

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