Hey guys, anyone with the APS TT have any problems with the overflow coolant tank overflowing. Mine did it again but it does it when the car is stopped and not moving and even when the car was just turned off.

The day was super hot, any thoughts.WTF

it does not do this when the car is moving and temps stay normal

 

Get a bigger overflow tank? The APS one is pretty small, alot smaller than OEM. Higher temp radiator cap also? Also you might try purging the coolant system, you could have an air pocket hidden in there somewhere.

 

I have the Nismo rad cap, and yes that overflow tank is small.



where can i get a tank that will fit with the TT in?

 

+1. Sounds like you've got a bubble somewhere. Try burping the line... But FYI the coolant systems on our cars is a royal B1TCH to bleed if you do in fact have an air pocket. Good luck.

 

What about your thermostat?

 

i still have the stock thermostat

 

Honestly, it sounds like an issue with the overflow tank being too small, if it ONLY does it on really hot days, and no other time.

 

I mentioned it before you might want to check that, and even replace it with a Nismo one, it may be malfunctioning and not opening up all the way causing the overflow at stops.

 

you were just posting about your car overheating a couple weeks ago. I am sorry, this paired with overheating = head lift. It might not be that bad right now, but it will keep getting worse. Your coolant system is being pressurized and pushing the coolant out the overflow.

Your car may run 100% fine for days on end, but you will have reoccuring issues like we see here. Just be prepared for replacing the headgaskets in the not too distant future

 

This happens when the car is turned off and the turbo timer has turned off, the water just seems to boil over. Do you really think the headgasket if gone...

 

not gone, but there is definitely something going on related to the HG IMO.

these are exactly the symptoms I was seeing with my car

 

really this only happened twice now and it was on really hot days, I have driven the car hard and not issues.

I think my HG is ok, I hope.

 

Your over flow is just because you have too much coolant. Mine did this until i had hardly any coolant in the over flow tank.

 

I had the exact same problem with my greddy setup, it turned out to be my aftermarket greddy radiator cap, it was opening prematurely, I put the stock cap back on and had no problems. I suggest flushing the system and putting the stock cap back on and i'll bet the problem goes away.

 

I didn´t have any overheating problem with my engine , and have the same problem with the overflow coolant tank , after a long ride or in a hot day, the tank is overflowing, but this only happen, when the car was just turned off.I´m tired of the small aps overflow tank..........

 

thats exactly what i am going through......

 

i am having this problem too.. it seems that after not adding any coolant for a few weeks, it sits at around 1" of coolant or less in the res when cold. so odd.....

 

I have an APS TT on a built motor and the bottom line is that
the tank is TOO small and the fact that the electric fans trigger
too late. With the air con on, one fan runs as long as it is on and
will help some. I needed extra cooling anyway, so I bought one of
Forged Performance's fans and shroud kit, and trigger the fans at a
lower temp. It fixed the problem and the car runs cool. One benefit
of this is the fan or fans make enough noise, that I don't hear my clutch
and transmission rattle at idle anymore. Just kidding on that part, but
the fan kit is great.

 

anytime you loose water out of the overflow and it is enough to spill out the tank, the rad will suck back in just as much fluid as it spit out when it cools. if you get any fluid on the ground, and do not replace it, you will eventually suck in air.
i found a polished stainless steel overflow tank for cheap (like $30) and it is a 3" round tube that is about 14" long. holds quite abit of fluid and will fit right down the side of the rad. holds more than any tank i have seen on our cars.
+1 on replacing your rad cap first. i had a 16# one and kept loosing fluid alot. i tested it and it would open as soon as 3#!!! i now have a 22-24# cap and have not had a prob.

 

here is a link to ebay with a bunch of them

http://search.ebay.com/stainless-ove...sooZ2QQfsopZ32