1998 528i Over Heating

[xxxJohnBoyxxx]

Working on a 528i. Customer states it is over heating. Drove car, yep it's over heating but takes for ever to warm up. Dealer said car needs a head gasket at $3,000 which it didn't need, did a wasted leak down test myself cause the dealer said exhaust in cooling system. Here is the cause which took me a few hours to figure out. Nice work by someone

[1996 328ti]

Nice.
You sure the spring isn't in the system somewhere?

[xxxJohnBoyxxx]

Originally Posted by 1996 328ti

Nice.
You sure the spring isn't in the system somewhere?

Yes fairly sure it couldn't get into the system, the hole in the block was too small and had #1 cylinder sleeve casting behind it and in the way. With the T-stat gutted the water just goes from bottom hose to top hose through the passage. If you don't block with passage with a t-stat there is no way to circulate the water through the engine. At least that is what it looks like to me. Replacing it took care of the over heating issue, I hope. Customer says all is good and I drove 22 miles to try to make it over heat and couldn't get it to do it. Also checked the water pump which was new, replaced the mechanic fan with 2 electric 3,000CFM fans, sealed the cooling cassette to the rad and condenser. All these mods made the car move a lot of air through the radiator and I'm 99% sure all is taken car of. The mechanic fan clutch was so bad I could hold it with my hand while the car idled.

[teetime4one]

Nice work my friend