Hi Guys: So I noticed my motor was getting warmer than usual and I checked the coolant to find it was low. This is the second time this has happened since I picked up from the shop. A couple of questions, I do see coolant leaking from the front of the radiator seam, and after a long drive yesterday I opened the hood, and saw some coolant sprayed on the inside of it. Can I lose a lot of coolant when it is under pressure? As soon as the car shuts off the radiator makes a hissing sound for about 5 minutes. I assume this is a leak somewhere venting steam? Also, put my finger into the expansion tank and it is empty?
I've often heard of them as header tanks, the ones on the 400 are supposed to be dry...that's in its cold state. The radiator cap is not a pressurized one, just a plain cap...the header tank has the pressurized cap. Completely opposite of regular cars. Coolant will expand into the header tank when up to temp. & will be drawn down as the system cools. But I don't think the overflow tube in the header tank draws every last drop out.
