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#1
01-08-2010, 08:30 AM
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Hot flashes (when cold?)
Ok, 1985 300sd started somewhat reluctantly this am (-12c). Let warm up somewhat and drove about 1/4 mile and noticed starting to warm up (normal proceedure in am). Got onto interstate and temp guage showed one needle above 80c (normal again). Got up to cruise speed and temp started climbing to around 90c and stayed. Drove the 15+ miles cautiously and it didn't get any higher. Into town, slowing the temp dropped, eventually to 76c or so (below normal for this car) and stayed there. Any ideas on what's going on? Coolant and fluids ok, so is antifreeze.
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#2
01-08-2010, 08:43 AM
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Air lock?? Have you done anything under the hood lately?
sticky thermostat Was it that hot or was it a faulty reading?
__________________
Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#3
01-08-2010, 11:08 AM
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Check your thermostat, may be stuck open.
__________________
http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg
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#4
01-08-2010, 11:37 AM
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Quote:
__________________
1998 E320 150,000 1980 300SD 240,000 1965 190D 79,000
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#5
01-08-2010, 12:03 PM
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thanks for the responses. I'll fire up the garage heater this afternoon and try the thermostat..any tricks?
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#6
01-08-2010, 01:34 PM
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You can just replace it as it's cheap.
Or you can put in water on the stove with a thermometer and turn on the heat to see at what temp it opens. Should be 80c.
__________________
----Adam 1985 300SD 322,000
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#7
01-08-2010, 03:06 PM
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Betcha the thermostat is installed backwards. IIRC, the bimetalic spring should be on the engine side of the valve. If its reversed, then its on the cold-coolant side and won't open until enough heat has bled through the closed valve to warm the cold side to opening temperature. The effect will be most pronounced in winter when a lot more heat is needed to get that thermostat to even crack open a little bit, and when you push the engine hard shortly after starting, causing it to warm up fast. You did both.
I'm betting the timing of this happening with getting off the freeway is either coincidental, or the freeway air stream was chilling the outisde of the thermostat housing and keeping it closed.
__________________
'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png Broadband: more lies faster.
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