They symptoms are temp gauge approaches 120. Coolant level light comes on even though tank is full and the switch is new. Granted ambient temps are high 90’s here in Atl but I still don’t think it should ever get that hot. Aux fans are running, plus I’ve got the resistor mod so they kick in early. Even with all that, it’s still getting to almost 120.

After searching around, I’ve noticed many threads talking about a couple things.

First off is an expansion cap change. I pull the cap off and it was in need of replacement, rubber broke apart in my hands. I used the cap off my E420 and its still exhibiting the same behavior. In any case I’ve got a new cap on order.

Secondly; the thermostat. Not sure how to check these, but they are cheap enough and easy to get to so why not. Do I try to get a fastlane part or just go to Autozone/Pepboys. If I go the domestic route, what part do I get?

Thirdly, I’ve come across many threads dealing with flushing the system. Draining it all, flushing with H2O (distilled only?), then adding Shout (pour right into expansion tank?) to degrease it all, then flush with water and then a citrus acid solution. I’m not sure where to get citrus acid locally. I guess I can try drug stores (walgreen’s eckerds, CVS, walmart even?)

I’m going to replace all the fluid with G05, which is what’s in there right now anyways.

I suppose I need to run though all that first before I keep bugging you guys with questions.