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-I had a similar issue when I did just a coolant change.
Did you guys make sure to fill it with the front end up high (on ramps) and through the upper radiator hose? Could be an air pocket in there.
This fixed my issue. Coolant back at mostly 80C all the time unless hill climbing or highway speed then it creeps up just a little.
I did read on here that all Tstats for this car are not created equal. Read that OEM from the dealer has best results, but still could be faulty...
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'82 300TD
'84 300D OM617
Auto to 4spd Manual Swap 716.210
'85 300SD 2.88 Diff (Direct Swap)
W140 HD Rear Springs w/ bilstein shocks (SLS Delete)
'83 300SD Big Brake Booster Swap
Late model 240D Manual HVAC Swap
W124 Outside Temp Gauge
Aftermarket Keyless Entry
'84 300D RIP
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