I just posted about this the other day, the car seems to like to creep-up towards the 105 degrees every now and then..at first, it works within normal range for quite a time (87) - maybe for like 20 minutes, but eventually the slight overheating happens...it seems like a random spike in temperature for some reason....

I changed the thermostat two days ago, parked the car on ramps to burp the system and let it run for a while to make sure there is no air in the system....

At first, I thought this was a an AC related issue, but i have been running without AC for the last two days to eliminate any potential issues with the system...still, temps spike for no apparent reason, and tend to stay higher after that.....

So, what could it be? New pump failing? that is really what is worrying me because i don't want to do the pump change again....

One thing I have noticed is that the small coolant pump near the battery (the shorter one) is ridiculously hot any time the ignition is on, even if the engine is not running......is that the mono-valve? and does it have any influence on the overheating issue?

New parts:

Hoses
Radiator
Pump
Thermostat (second on in 6 months)
coolant zerex g-05
radiator cap

thanks!!!!

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1993 300E, 2.8 M104 .....