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Thread: Coolant flush

  1. #1
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    Coolant flush

    Hello I'm wanting to drain my coolant system and I think I've got an idea how to do it but not totally sure. Do I do the following...

    Put car on axle stands
    take off overflow cap
    Pull up the drain plug till its all come out then replace it
    pour in hot water till it reaches the max line
    Run the engine to warm and keep repeating

    is this correct or are there any guides?
    2003/2004 Audi A3 2.0 TDi Sport

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  3. #2
    Lewis583's Avatar
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    Sounds about right. Don't forget to put your heaters on hot though and medium fan speed when running it up to temp. Not doing so can cause air locks.
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  4. #3
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    I can't find this coolant drain anywhere :-/
    2003/2004 Audi A3 2.0 TDi Sport

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    Quote Originally Posted by Tommy53 View Post
    I can't find this coolant drain anywhere :-/
    Thats because it doesn't have one unclip the lower hose.

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    That's the drivers side one on the rad isn't it? Do I need to disconnect the intercooler pipe too as its in the way
    2003/2004 Audi A3 2.0 TDi Sport

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    It's on my passenger side but yours could be different watch out for air locks mine took ages to purge remove the cap when draining

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    Sure this middle one is it. How do you purge it? Using heater matrix and driving?
    2003/2004 Audi A3 2.0 TDi Sport

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    Run it with cap off heating on stationery of course and squeeze large hoses to move air locks mine took a long time to purge.

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    How can you be sure it's correctly purged? I'm getting hot air through all heaters and no bubbles are coming up + the coolants not dropping any more.. Is that correct? Temp gauge sits just below 90 now tho, little much coolant to water ?
    2003/2004 Audi A3 2.0 TDi Sport

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    Quote Originally Posted by Tommy53 View Post
    How can you be sure it's correctly purged? I'm getting hot air through all heaters and no bubbles are coming up + the coolants not dropping any more.. Is that correct? Temp gauge sits just below 90 now tho, little much coolant to water ?
    Check your return pipe to the expansion tank has a good flow and keep an eye on it for a while as you may find your Poland level will drop as it bleeds .

  12. #11
    JudderMan's Avatar
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    I changed my radiator to a cheap eBay one, that is far better than the OEM one (especially as it doesn't have a hole in it) and it killed the thermostat, so if you think that you've got all the air bubbles out and the temp doesn't get up to 90 then it might need a new thermostat.

    To burp the air bubbles out, as mentioned do it stationary with the cap off, then go for a fast drive, getting plenty of load on the engine (hills 3rd gear) and check every 5 minutes to see if it needs topping up. I found that it needed a little more once it had cooled down after a drive.

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    Thanks all, seems to have settled now but I have a bottle of the coolant mixed with water in my car incase it drops
    2003/2004 Audi A3 2.0 TDi Sport

 

 

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