Hi. Does anyone know the correct running temperature for a 1984 300cd turbo. The highest temperature my car will reach is just below 80C. Although as soon as I put the interior heater on it drops way down to the mark just above 40C.

Would this be considered normal or is there something I need to look at.

Thanks in advance.

Thats not normal. Sounds like your thermostat is stuck open. Does it take a long to reach 80?

My CD and my wifes D take about 1-1 1/2 miles of driving to reach 80-85. Turning the heater on does not drop the engine tempurature noticably.

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.

It usually takes a good 5-10 minutes of highway driving for it to reach almost 80C, I have never seen it on or over 80C.

Guess I should test the thermostat.

Thanks

I agree, replace the thermostat, would be the first thing too do. You should be running a bit above 80c

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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"