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Old 08-24-2011, 07:55 PM
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Where is the thermostat housing on a 87 w124 300d?

Im Having overheating issues on hills and bought a new t-stat to try and solve the problem. I can't tell which radiator line goes to the t-stat housing, is it the upper one or the one lower on the passenger side of the block. Thanks

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Old 08-24-2011, 08:08 PM
aaa aaa is offline
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The lower.
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Old 08-24-2011, 08:17 PM
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Location: Seattle
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Originally Posted by aaa View Post
The lower.

It's NOT on top of the engine. There is something there that looks like it, that is where I broke a stud off the block.
08 R320 CDI current

95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D

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Old 08-24-2011, 08:54 PM
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Join Date: Apr 2007
Posts: 342
It's just above the alternator. BTW, the alternator in a 126 with a 603A comes out in about four minutes, making access to the thermostat easier.
James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
1987 300SDL junker 170k
1982 300SD junker, 265k
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Old 08-25-2011, 02:10 AM
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smoke gets in your eyes
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,834
In a 124 removing the 50*C temp switch just ahead of the thermostat makes it easier through by no means easy to replace the thermostat. Removing the temp switch is a puzzle in itself unless you have a wide assortment of tools.

87 300D

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