T-Stat & Housing - BMW Forum

blitz2120 · 07-26-2011, 01:17 PM

I have an '02 330CI and this now makes the third times replacing a t-stat and housing on this thing...Is this a common problem on the E46's? Granted it's covered under warranty after the first replacement, I just find it hard to believe these things keep failing...I keep a CLOSE eye on my temp now after these persistent failures...

Jack Dabsy · 07-26-2011, 03:00 PM

No... There is another issue mate... PRESSURE, (or lack of)... What, EXACTLY, are you noticing from a cold start to warm?

blitz2120 · 07-26-2011, 03:05 PM

I don't really notice anything abnormal, is there something I should be checking for?

Jack Dabsy · 07-26-2011, 03:14 PM

If the T & TH have been changed 3 times then that must suggest that they were not the prob !! It is possible that you either have a coolant BLOCKAGE or AIR-LOCK, or even worse, a cylinder head/gasket issue...

Does the motor overheat?

blitz2120 · 07-26-2011, 03:32 PM

I have seen my temp gauge go into the red a couple time sand let it cool down every time this has happened but it keeps pointing to a fault t-stat. The other day while watching the temp gauge, I could literally here the coolant boiling when at idle...It's coming out of the overflow too which makes me think it's not being cycled through the block...

Jack Dabsy · 07-26-2011, 03:52 PM

Start her up and let her run for 10 minutes...
Remove the rad cap and notice if it spouts like a Geizer!!
If it does, FIRSTLY replace the rad cap with a NEW one of good quality, and try again, from cold...
If same issues then it is surely a gasket/head issue... Good Luck..
DAZ

If the above happens, TRY a bottle of K-Seal in the coolant !! (Worked for me) !!

Jack Dabsy · 07-26-2011, 03:55 PM

The fault code on the stat maybe a false reading to lead you to my above procedure mate... Try it out!

brettski · 07-27-2011, 08:15 AM

Quote:

Originally Posted by Dabsy

Start her up and let her run for 10 minutes...
Remove the rad cap and notice if it spouts like a Geizer!!
If it does, FIRSTLY replace the rad cap with a NEW one of good quality, and try again, from cold...
If same issues then it is surely a gasket/head issue... Good Luck..
DAZ

If the above happens, TRY a bottle of K-Seal in the coolant !! (Worked for me) !!

Make sure you use the normal precautions when removing the radiator cap on a hot engine, don't end up in casualty with nasty upper body burns.