Hey!

Love the web site, love the advice y'all give.

I've got a question about some advice I got from the website regarding my 1985 300sd.

I looked at the thermostat replacement procedure for the w123.* I followed everything to a "t" with the exception of drilling the holes in the thermostat.

Backstory on my car;* The car has been in the family since it was purchased new. I know how to do most things but I'm in panic mode now.

With the harsh winter heading at us I thought it would be a good thing to replace my coolant and thermostat,* the procedure went off without a hitch. Until i started driving it. The car warmed up as it should but quickly started getting too warm. I also lost most of my heat.

(I noticed there is no bleed screw on these) I pulled the new thermostat out, replaced it with the old one, thinking I got a faulty unit. Still got too warm.

After that; I parked the car on a very steep incline brought it up to operating temperature,* squeezed the hose waited for the air to purge itself... no help.

I took it to a shop, they said that I might air trapped behind the heater core. The replaced all of the coolant and pressurized the system... no help.

I asked them if they thought it was a blown gasket. But I've had no power loss, no fuel, water, or anything weird in my oil, no excessive smoke. Nothing at all weird.
They checked the old thermostat and put another in... no help.

They thought then it might have been the water pump. I told them the car would cool down when I turned the heater on so I didn't think it was the water pump, we replaced it anyway... no help.

I'm at a total loss here fellas. My car is still getting uncomfortably warm and it really worries me. Can you throw a suggestion or two my way?

Any help appreciated
Thank you!