Coolant leak problems? Leaking problem on back of engine (coolant flange leaking)?

Tiny
VISI1100
  • MEMBER
  • 2002 AUDI A4
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 180,000 MILES
Hi,

Hope someone can help me with some info. For a long time having some problems with my car listed above b6 2.0alt engine (non turbo).
First had a problem from leaking coolant after spending more than $800.00 with local mechanic that never solved anything I started myself. Searched everywhere and found leaking problem on back of engine (coolant flange leaking)
Replaced it with a new one and all good. A month later I noticed oil in the coolant reservoir. So, I changed the oil cooler that was damaged). After replacing oil cooler I started filling up with new g12 coolant and started to bleed air (so hard on this model) after this I was losing a lot more coolant. Checked everywhere for leaks and finally I found it. All coolant is going out from coolant reservoir. The reservoir was not damaged but coolant was coming out from it maybe not a good reservoir cap or I am not sure. Now my cooling system (blowing hot or ice air inside car never worked properly) if I have gas for A/C it only has cool air no matter if I leave it in min or max temperature) so I am not totally sure if there is any more air left inside cooling system.
I found that when I rev my engine with reservoir cap open the coolant goes up and up until it goes out of reservoir. Is this normal? Do I need to change only the reservoir cap for coolant not going out or there may be another problem? Mos parts on car are new example (radiator, thermostat, coolant pipes (most of them) they are all new replaced around 5000-7000km before and the engine to I have replaced not long time ago cause the old one consumed a lot of oil. Hope someone can give me some ideas what to check next and if can tell me if it is normal for coolant to flow a lot when revving the engine or not.

PS- don't think the head gasket is the problem because I don't have any smoke coming out exhaust, oil quality is good so no coolant in oil and engine run well.
Code on vag I have only o2 sensor I'm replacing it after I fix coolant problem.
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Saturday, August 20th, 2022 AT 5:53 AM

3 Replies

Tiny
KEN L
  • ADMIN
The head gasket can still be blown without white smoke or coolant in the oil, I would do a chemical check. This guide can help you. Also, if the engine overheats quickly, you could have a defective thermostat.

https://www.2carpros.com/articles/head-gasket-blown-test

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Saturday, August 20th, 2022 AT 3:26 PM
Tiny
VISI1100
  • MEMBER
Thank you for your answer, but the photos diagrams below are not for my engine model cause I don't have 1.8t engine. The chemical test I have done before is okay, just the pressure test haven't done. I know that all coolant is coming out from reservoir cap. My engine does not overheat max goes 93 grad Celsius and radiator stat so it goes down to 86 again never overheated. Wanted to know does coolant goes up when revving the engine is it normal? Now one more thing I found today. When car is parked for 24h I started and waited to get the normal temperature I was checking coolant if was hot or not when engine showed around 80grad Celsius it was cool but in just 20 seconds it got really hot but temperature on vag and dash was still same! Is it normal?

Ps- coolant leaks from reservoir cap only when temperature reaches 90-93grad Celsius (when radiator goes on (it starts at 90grad or 93grad Celsius)).
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Saturday, August 20th, 2022 AT 4:25 PM
Tiny
KEN L
  • ADMIN
Yes, it is normal for the engine coolant to go up and down with engine RPM. It sounds like you have a stuck thermostat. We only have the 1.8 in the state, so I don't have access to the 2.0 liter engine. If you can upload images I can help walk you through the repair.
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Sunday, August 21st, 2022 AT 1:15 PM

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