Good morning to all.
I own a 1983 300SD.Last September i had to replace the engine radiator.These past few weeks we had very cold weather and not much heat is coming out of my heater.
Last night i had to go on a little trip of about 70 miles,all of this on highway driving.The temperature gauge barely went over 40c,and i hardly had any heat at all.
Could my thermostat be faulty?
Regards
Dan Vancouver Canada

Sounds like a monovalve. Search on that term and you'll get loads of info.

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

Not the monovalve, if it were, he'd have too much heat, and be baking inside. As it is the engine itself isn't warming up. Replace the thermostat, or swap it with a known good one. Let us know what you find...

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'79 300D, Ivory "Gunther" ......going
'81 300SD, Metallic Blue Silver, The Grey Ghost.....going
'87 300D Turbo ...gone
'05 CDI.... gone

I will do that !

Thank you and have a great new year!
Dan

Second on the thermostat. Had the exact symptoms in my 84SD, engine temp never went above 50C or so...drained about half the antifreeze, popped off the thermostat and sure enough it was broken. After replacing toasty warm heat. Takes about an hour or so. You can always check the monovalve as well, take all of 5 mintes to take out the 4 screws and check the valve.

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Chris
1983 300SD Cypress Green
1984 300 Turbo Diesel Petrol Blue Green (Sold...)

Thanks a million Chris

Oh by the way Chris...Have you ever flown in to YVR?
Dan

Don't know about Chris, but I used to bring the company jet into YVR on a regular basis. The president bought a yacht there. 5 million and it never left the marina until he sold it a year later.

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'79 300D, Ivory "Gunther" ......going
'81 300SD, Metallic Blue Silver, The Grey Ghost.....going
'87 300D Turbo ...gone
'05 CDI.... gone

I've been needing to replace the thermostat on the wagon. It often barely makes it to 100, and my gauge is in Fahrenheit......
Thanks goodness these aren't to difficult to replace. I assume mine is stuck open......

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

A faulty monovalve can cause either excessive or insufficient heat, depending on the nature of the failure. (Which is not to suggest that the monovalve is suspect in the described situation.)

Never made it that far North. Most of my flying has been on the East coast, some trips for training in the NV desert, and overseas from floating sovereign us territory.

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Chris
1983 300SD Cypress Green
1984 300 Turbo Diesel Petrol Blue Green (Sold...)

Well talk about night and day!!

Just replaced the thermostat this morning and heat I have and then some!! I would assume that since the engine was running cold all that time that my fuel consumption will decrease somewhat from now on...correct?
Thanks so much guy's!
Best regards
Dan

Yes, your mileage should be better with your engine at proper temperature....
but perhaps more important the wear on the engine will be less...