95 Tsi AWD Very High Temp

[JOLTY TacoMan]

While driving back from my AM aviation class I noticed my temp gauge was almost pegged at the top. I moved into the slow lane and costed as much as i could until i reached my house, about 15 miles from the school all highway. Now the car gets very hot when driving consistently for least 10 minutes and i cant seem to find the cause. I had a coolant flush done by valvoline yesterday and it still gets very hot.

Possibly unrelated but I believe i have a boost leak. The stock LICP was damaged and had a minor leak which i believe was the cause of it bucking so i replaced it with the dejon LICP. The couplers fit perfect on the LICP and the side mount but is slightly to large for the turbo so i just tightend it as much as i could. I assume i need some for of reducer dejon did not send me because it still bucks under boost.

Only mods are Intake, MBC set to 15psi, and Dejon LICP.

 

[ExpresS]

Replace the thermostat.

 

[dsmpat95]

Make sure your not leaking coolant. Check radiator cap pressure. If those check good check your fan operation. Next I would check the t-stat. If those check good do a leak down test to check your headgasket.

 

[Bud92gsx]

+2 on the thermostat..Is the fan turning on when it gets hot? I'm suspecting no, since it stays hot..

 

[DirtyDave21]

i agree with expresS. did valvoline desribe what condition the coolant was in?

 

[TSiAWD666]

If you did the flush properly, with burping, then it's time to move on to some more detailed diagnostics.

First could be the thermostat not opening. Check that by making sure it opens in boiling water.

Next could be your radiator cap is leaking and not holding pressure. Could just try getting a new one, or getting a coolant testing kit that includes a radiator cap tester. Can get these kits on loan from your local Autozone or similar place.

Next it could be your engine pressurizing and heating the coolant directly via combustion gases. With the above kit should be a pressure tester to attach to the radiator cap mount while the car is cold. Watch the pressure gauge until the car is warmed up. I forget unfortunately at what pressure you're likely to have a problem with coolant pressurization (like from a head/block issue, or a headgasket), but if your pressure gets too high when just warming up that's likely the problem. Don't disconnect until the car's cooled off otherwise you'll end up with a face of really hot coolant and steam. You can also test your coolant for combustion gases with a chemical test that I know NAPA carries (sometimes you have to have them ship it in which takes usually one day).

Might be other things others can suggest as well.