Audi A4 2003 Coolant level

[Hems217]

Can someone please help...?

I've recently bought an Audi A4 Avant Sport 1.9tdi 2003 model. The car has only done 113k (17k since 2011!).

After driving it for a few days, I've noticed that the Engline Coolant level goes from half way (normal) up to just under the maximum. If i turn on the heaters (in this weather it's a nightmare!), the engine temperature reduces back to the normal half way point.

Now when buying the car, I did know that it's been serviced last in 2014 on 107k, but i don't know whether that would have any impact on this. It's at the garage now as i type this getting a service nonetheless.

I just want to know if the problem i have (engine coolant) is an easy fix as some forums i've read say that i just need a new thermostat, but some say it could be a radiator blockage so it needs to be replaced?

What could the issue be & and what sort of costs could i be faced with??

Thanks!

[Dr G]

Hems217 said:

After driving it for a few days, I've noticed that the Engline Coolant level goes from half way (normal) up to just under the maximum. If i turn on the heaters (in this weather it's a nightmare!), the engine temperature reduces back to the normal half way point.

Welcome to Pistonheads.

I presume you're referring exclusively to the temperature gauge rather than the coolant level?

If so then yes, a replacement thermostat is the obvious first port of call although it isn't impossible there is a different problem within the cooling system. All new coolant at the same time is a good idea (and cheap) as what's in there could be 14 years old...

Your turning the heater on does the same thing as the thermostat opening. It removes heat from the system, in this case dumping it into the cabin rather than escaping from the radiator.

[Hems217]

Hi,

Thanks for your reply!
So would you suggest replacing the thermostat and engine coolant? I'm hoping that is a small fix like this but as you say, it is 14 years old!

Thanks!!

[Dr G]

That would be a sensible first move. Have your mechanic look for any collapsed, ballooned, or crappy looking hoses whilst they're in there.

Edit: I'll bet you it's well past due a timing belt & water pump...