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#1
04-04-2004, 12:09 PM
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Cold engine tonight -- thermostat?
This evening, on the way home, I noticed that the engine temp never rose above 60 degrees C, well below its usual 90 degrees. It was, therefore, a rather chilly trip. I presume that the thermostat has stuck open, but I'm surprised that the engine never warmed up at all, rather than warming rather slowly. Could there be any other explanation, or is this normal behavior for a stuck thermostat on a 617?
Phil '84 300D '85 300D 
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#2
04-04-2004, 12:12 PM
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Stuck therostat. This is normal behavior, since it's not closing, then engine will warm up but never reach operating temp. If it was really cold outside, the temp would drop while you were idling, too!
Replacement is fairly easy so long as none of the housing bolts is siezed. Use some anti-seize on them when you put them back in. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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#4
04-04-2004, 12:41 PM
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i had the same problem and it was definitely the thermostat. it was cracked and a piece was broken off on one side so it could not close. i went out and bought a new one for like 12 bucks or so and installed it in about 10 minutes. nothing to it, definitely anybody can achieve this minor repair.
once you put it in you will get HOT air blowing into the car again Good Luck
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Audi TT
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#5
04-08-2004, 10:48 AM
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Arrow, what arrow?
Stevo says to put the arrow up. I been lookin' and I been lookin', but I sure can't see no arrow nowhere. Hints, anyone?
He's right about the party, though. Phil '84 Euro 300D, looking for an arrow '85 300D
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#6
04-08-2004, 12:48 PM
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Phil
I have heard roomers of T stats w/o the arrow. What brand did you get. I dont have a new one over here ether. I did installed one without regard to arrow position and she ran hot tho.
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 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#7
04-09-2004, 10:42 AM
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No arrow , no matter.
I put the new thermostat in place oriented exactly like the one I removed, and all is well once again. I saw no arrow on either thermostat, nor did I see that the orientation would matter anyway.
Now, the engine runs a little cooler than it did before the thermostat broke, but lots warmer than it did with the (obviously) broken thermostat in place. I'm still curious about the reputed arrow. Might this consideration pertain only to older model year diesels? 240D's only? Phil '84 Euro 300D, warm again inside '85 300D
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