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I want to change the thermostat in my 2001 Audi A3 8L1 1.9L myself, but I don't know which one to buy. I went on my local dealer's website, punched in my vehicle information, and I got a few thermostat results from different manufacturers. They all have the same temperature info, but vary in size.

Since I don't have any technical specs for my car or anything like that, how would I go about choosing the right one?

  • Wow, it is very difficult to find parts for your car online from both US and euro sites. Do you know the engine code? There were 2 versions of the 1.9 in '01; there were also 2 different versions in '00. Your choices are: AGR/ALH, ATD/AXR, AHF/ASV, or ASZ. – Zach Mierzejewski Nov 15 '16 at 14:56
  • Yes I know its hard, if it were easy I wouldn't have posted here. ^^ My engine is ASV. Could you tell me on which sites you are looking for parts? Maybe there are some good ones that I missed... – Eric Nov 15 '16 at 14:57
  • I found that the same thermostats work on all four versions of the engine. Here are some thermostats for your car in the UK. – Zach Mierzejewski Nov 15 '16 at 15:03
  • Also, what do you mean they "vary in size"? Which dimensions vary? – Zach Mierzejewski Nov 15 '16 at 15:04
  • @ZachMierzejewski The thermostats you posted also vary in size - height specifically. One is 55 and the other is 31 and some do not supply the diemsnions at all. How can I be sure it will fit my car? – Eric Nov 15 '16 at 15:07
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Go to a site for parts diagrams with a VIN/chassis number lookup like http://www.realoem.me. Give it a try, I think it will be quite helpful.

Using that site based on an ASV engine I believe you need 044121113

  • Yes I also think the part number 044121113 is correct. I visited the website you posted (very good website) punched in this code, clicked on Buy and ended up on FCPEuro website, chose the Genuine part, chose Fitment tab and guess what, my model IS NOT listed. This is what bugs me! Any thoughts? – Eric Nov 16 '16 at 13:24
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@FCPEuro neat website

What I always look for is:

  • is it in the correct temp range for your car
  • is it a high flow thermostat?

you need the proper temperature so the engine will run correctly without getting too hot or cold.

A high flow thermostat can relieve some problems with extra hot days.

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