I have an 85' 124 300D (603 engine). I'm running kinda hot on the slightest stop and go traffic. When normal driving I get about 95-100 and the moment I come to a stop-n-go traffic it goes up to 105-110. The strange part is that when I rev the engine - the temp goes back to 95-100.

What could be wrong here? Here's what I have already done:

1) Replace Radiator
2) Replace water pump
3) Replace viscous clutch
3) replave T-stat (85 degrees)
4) clean/flush cooling system
5) put 50/50 coolant mix
6) AC/AUX fan OK both low and high speed

Did I miss on anything? Some say it could be engine timing.




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94' E280 Euro
85' 300D Euro
87' 250D Euro
77' 300D Euro
Manila, Philippines

Well fwiw, I just had a inj.pmp R/R at 15 deg ATDC(instead of 24 BTDC) and it ran at about 80-85C. So timing would still be worth taking a look see but make sure a MB tech does it that way you know the right test equip. will be used.ie. let him check using the RIV method he won't likely use the drip method. (expensive lesson speaking here! )

quote:

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Originally posted by francis:

I have an 85' 124 300D (603 engine). I'm running kinda hot on the slightest stop and go traffic. When normal driving I get about 95-100 and the moment I come to a stop-n-go traffic it goes up to 105-110. The strange part is that when I rev the engine - the temp goes back to 95-100.

What could be wrong here? Here's what I have already done:

1) Replace Radiator
2) Replace water pump
3) Replace viscous clutch
3) replave T-stat (85 degrees)
4) clean/flush cooling system
5) put 50/50 coolant mix
6) AC/AUX fan OK both low and high speed

Did I miss on anything? Some say it could be engine timing.

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93 F-150 4X4 110k still strong(them oil changes pay off!)
86 Ninja 1000 60k(sold)
85 300SD 168k
94 C280 58K (what a blast to drive, 100+ easy)

BE sure to check the basics first. Make sure the fuse for the auxillary fan is OK and the fan is working. Install a new thermsotat for good measure.

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Basics already checked. I could hear than fan spin ery strong coz' I stepped out the card during traffic to check. As I said in the first post - T-STAT was also replaced to a brand new one.

My problem is only when the card comes to idling - when revved higher during idling the temp goes down. Can timing cause this?

Francis

quote:

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Originally posted by Benzmac:
BE sure to check the basics first. Make sure the fuse for the auxillary fan is OK and the fan is working. Install a new thermsotat for good measure.

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94' E280 Euro
85' 300D Euro
87' 250D Euro
77' 300D Euro
Manila, Philippines

Audit your temp sending unit and / or temp gage. You could be getting a false reading.

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Jake