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  #1  
Old 10-25-2011, 09:11 PM
Greg
 
Join Date: Dec 2008
Location: San Carlos, California
Posts: 431
Engine Operating tempurature Flucuation Issue

For awhile now my 300TD has not been able to maintain a stable operating tempurature. in traffic it will hover just above the 90 degree C mark. at highway speeds it stays stable at the 80 degree C mark or just above it depending on the ambient tempurature outside. But, if i get on it to pass a truck or go up any sort of grade the tempurature starts to climb and will stabilize around the 90 degree mark if it is cold outside.

Just this weekend i was in a caravan of vehicles moving slowly along some steep wind-y roads. for the first port of the accent we were moving at a good 35 miles an hour but the temp just kept climbing moving up to the 120 degree mark. with the heater on full blast i was able to stabilize the temp before reaching 120. but i could not get it to drop untill i reached my destination and shut off the engine.

so to get to my question, is this a coolant flow or airflow problem. I have more evidnence to support the former as the fan clutch does engage fully and engages at the correct tempurature.

where do i go from here??

Disclaimer: For those of you who have read my thread about burning used motor oil in my engine, this is an unrelated problem and it has been going for quite awhile.
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Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"
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  #2  
Old 10-25-2011, 10:10 PM
Registered User
 
Join Date: Aug 2009
Location: MN
Posts: 1,182
Check that the air flow through the radiator is not blocked with debris.
If not, replace the radiator.
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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
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  #3  
Old 10-25-2011, 10:23 PM
Greg
 
Join Date: Dec 2008
Location: San Carlos, California
Posts: 431
Quote:
Originally Posted by GregMN View Post
Check that the air flow through the radiator is not blocked with debris.
If not, replace the radiator.
I did clear a couple of leafs out, but there wasn't enough blockage to affect the flow enough to cause that sort of behavior.

as for a new radiator, my father and i have only used Behr radiators in all of our cars. however the only one fastlane shows for the 603 engine is made by nissin. any change in quality there???
__________________
Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"
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