When I've been driving for a while the needle is between 80 and the next line (100?). Sometimes it gets close to the "100" mark (usually when I'm sitting at a light) but never passes it. If I turn on the heat full blast it goes down close to 80.

So I guess my question is.... Is hitting 100 too hot or is that within normal heat?

digi

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1984 300td euro turbo

Too hot would be something more like 120C. The red part of the temp gauge.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)

So what I'm experiencing is somewhat normal temps?

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1984 300td euro turbo

80C and just a couple of degrees higher, seems to be the average temperature of most 603 cars discussed on this forum. Consensus is, that heat is the enemy of the cylinder head. Closer to 80C is better.

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1987 300D 146K Original #14 Head
One eye on the road, the other on the temp. gauge

Gone But Not Forgotten
1983 380 SEL Long gone
1983 300SD Wish I hadn't traded it in on a 90' Corvette
1989 300SE My all time favorite
1995 E420 Went like a bullet

What can I do to get my car temp lowered by 10C?

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1984 300td euro turbo

You've got an iron head 617. Not nearly as finicky with temps as the Al headed 603 motors.

Anywhere between 80 and 100 is OK. Most usually run in the 85C range at all times.

If you want more constant temps:

Step #1: Replace radiator cap
Step #2: Check fan clutch
Step #3: Check/change thermostat and flush coolant

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

Thanks!

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1984 300td euro turbo

What's the status of your viscous fan clutch?

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92 300D 2.5L OM602 OBK #59

I'm not sure! I will have to check it!

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1984 300td euro turbo

On my 81 SD I installed the smaller water pump pulley with the plastic fan .
My temps went from 100* down to a steady 80*

On your 84' I think that's already done though.

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Experience : what you receive 3 seconds after you really needed it !!



86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes

I thought the small pulley was standard on all 83 and up vehicles, but apparently it's only for the SD chassis. his TD would be a 123, so it should have the large pulley, perhaps he can check the size belt he uses, and see. if it's 1035, it's the large pulley, 1000 is the small one.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

K I'll check. It's pouring here so gotta do it tomorrow.

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1984 300td euro turbo

So I gave the fan a spin and it barely moved. I could turn it but it immediately stopped after I let go no matter how hard I spun. Does this mean the clutch is bad? Going now to check the belt size.

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1984 300td euro turbo

Does 1037 sound correct? Not sure if I'm looking at the right pulley.

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1984 300td euro turbo

Perfectly normal.

The fan will start somewhere a little over 100C. Therefor, at a stand still, you basically have no cooling until the temp goes a little over 100C. If it continue well past 100C you shuld have things checked.

I had to replace the radiator on mine, as it was clogged.