Re: Coolant Problem/Thermostat location? '92 100

["Craig D. Niederst" <niederst@telerama.com>]

I am currently having the same problem with my '92 100S. I do not believe
the thermostat is the problem here. My water pump had starting chirping a
few of months back, so I had it replaced along with the thermostat. I hoped
replacing either the water pump or the thermostat would solve the mysterious
coolant loss / erratic temp gauge problem, but no luck. If you are actually
having the same problem as I am, you are losing coolant through the cap on
the coolant reservoir. It has a pressure release feature built into it, and
when pressure exceeds the limit, it comes out through the cap so a hose, etc
will not rupture. It took me awhile to figure out where the occasional
coolant on the garage floor was coming from myself. So far, I have not been
able to solve the problem. I posted this to list  twice in the past 4
months, and have gotten probably 3 responses total. Two said I had a bad
head gasket or cracked head, and exhaust gas was getting into the coolant
system, causing the higher pressure condition. The other said my
thermoswitch was bad, and the cooling fans were not coming on to cool down
the engine properly. I had my head gaskets replaced at 55k, so I doubt that
is the problem (I hope!). I also replaced the thermoswitch on the radiator
about a year ago (the cooling fans were stuck on high all the time), so I
again doubt that is it (unless the dealer gave me the wrong switch!). So I
am basically at a loss to what the problem is. If yourself (or any Listers)
have any input, it would be greatly appreciated.

Craig
'92 100S (80k)