A Penny For your thoughts on M54 cooling.
About 10 months ago I replaced the thermo, waterpump, upper/lower hoses, coolant sensor, fan switch, and expansion tank with refresh kit from ESC. A couple months ago the temp needle would spike, but the red light wouldn't turn on. After scanning through different forum posts I decided to re-bleed the system. That worked for about a week. Fast forward to 2 weeks ago, I went ahead and started throwing parts at her hoping for the best. New fan clutch, thermo, waterpump, expansion tank hoses, fan blade, and all has been good for the past 2 weeks, or so I thought. I was idling in the pickup line to get my boys from school, and damn it, it happened again. Before leaving the house today I just happened to check my oil and while there checked my coolant level, and the expansion tank is empty. WTF? There are no leaks from the hoses or the radiator that I can see, however, there are small puddles of coolant behind the alt. and above the OFH in some of those checkered crevices. I know I should take it somewhere to have it properly diagnosed, but was wondering if there's something I'm missing that you can can suggest I check myself. I hear a slight hiss after turning the engine off somewhere down and behind the oil filter canister. BTW, i changed my oil 1200 miles ago and it was just regular old dirty oil. Sorry for the wall of text, but I'm a bit peeved and frustrated at the moment. Thanks in advance for any help or advice you can give.
Tan interior w/black dash,black parcel shelf, black front seat backs, black speaker covers, black floor mats, black door card tops, black Euro armrest, black door pockets, black M5 footrest | Bilstein sports | H&R sport springs | M5 rear sway bar | DDM 6000K Fogs | M5 rear lip spoiler | Ipod DICE kit | AFE Pro Dry air intake | 18" Beyern Mesh wheels | Umnitza FX-R headlights 55W w/Orion V2 Halos | Black grill & Shadowline Window Trim | Silver gauge rings | rear cup holder delete | 191K miles