ML 320 2002
I just opened up the helpful info you sent now after replacing water pump but I have a another problem. But I will beable to double check my work against your very helpful information, thank you ever so much!!!!!

Short end of the problem experiencing:
ML 320 2002
Just replaced the waterpump drive around the block all looks sounds good, put the plastic engine cover back on now car turns fine but won't start return from a function start working again on the car, remove the plastic engine cover car starts, drive around the block car dies 10m from the the drive get out fiddle around, car starts with engine light on.
(ps the the vehicle overheated probably for 30 sec while I worked my way out the main Hwy when the pump blew, maybe it fried the thermostat as i feel no pressure in the top hose when it reaches approx 80 temp on the dial, anf the computer has registered this and this is why the engine light is on, in addition when it had this intermittant starting problem it's the weidest start ever as all is turning and working, belt starter motor etc but its a longgggg turn but obvioulsy with no spark or ignition - I thought it might be the security in the key or the plastic engine cover snagged something or again the thermostat)
Now ???