Running hot and No AC

Inspect the complete cooling system might be new RADIATOR time. 4 water pumps is a clue lots of debris in system. look for loose fins on the radiator and corrodes areas If you really like the vehicle replace the Radiator. 17 years, was good life for the old one.

Her radiator is fine...just had it checked. The only reason she has had 4 pumps...the first one cracked when she was ten, then the dealership put on the wrong one at that time, leading to a complete over haul of the the engine and pump #3. 4 came when her timing chain was replaced along with several hoses and her belts...which was 2 years ago. The only thing that has changed with her at all is the AC has stopped.

The AC not functioning will not effect the engine temperature. There is less load on the engine without a compressor working to compress refrigerant. UNLESS, its binding and the belt is slipping or burning (I think you would notice) I would expect water pump number 4, to still be Ok after only 2 years. which leaves the temp sending unit... after starting and displaying an almost instant 150 degrees sure doesn't behave like a t-stat, we all know it takes a while for an engine to come up to temperature not a few seconds! If you have a multimeter check the Resistance of the coolant sender / sensor unit..COLD 50-80deg 9400 Ohms.... HOT 180-220deg.175 Ohms.. IF resistance doesn't decrease as the coolant temperature rises replace this $15 sender / sensor. Regards

Thanks. I also wondered, could I have a belt pully that is not working?