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Old 10-13-2001, 10:38 PM
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1980 450sel - Where is the thermostat?

Looking for some additional help. Thanks to everyone for helping me pinpoint the problem with the left side headlights being out. Seems as though the car only got 2000 miles on it in the last 6 years (before I bought it last month). The fuses were crusted and corroded. Changing all the fuses fixed all the problems.

Next issue. I just replaced the climate control servo. Greasy cheesy, quick and easy. But, my temp gauge never gets over 60 degrees celsius, and I get no hot air from the heater. I'm suspecting a bad thermostat, but I can't find where the little bugger lives. Before I start pulling pieces off the car, thought I would defer to you all to tell me exactly where it's at. I intend to get the full service manuals soon, but not before the first frost here in the great midwest. Thanks in advance for your help.
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Old 10-14-2001, 02:00 AM
MikeTangas's Avatar
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Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Crawl under the front of the car. See the lower hose, where it comes out of the radiator? Follow it up behind the fan, see where it attaches to the water pump? You are almost there.

Drain the radiator, disconnect the lower hose at the water pump. The inlet to the pump is held on by three 10mm bolts, remove them and tap the tube gently. Hint: the thermostat is hiding under there . Once that tube is off, you will pull out the O-ring gasket and the T-stat should come right out. The bolt on the block side is a bit tricky to get at, using a 1/4 drive rachet, with a 6" extension did the trick for me.

Installation of the new T-stat is the reverse. The new T-stat should have a new O-ring with it, be sure to use a new O-ring and no sealant. Make sure the T-stat is oriented correctly with the vent at 12 o'clock, and that the "crown" is facing out.

Hope this helps.
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon least its a diesel

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Old 10-14-2001, 10:12 AM
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Join Date: Dec 2000
Location: charlotte hall md.
Posts: 248
Mojo baby,buy a service book our CD
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