Cadillac Repair: cadillac 1994 deville concours, engine coolant, head gasket

Question
hi tom question is for an 1994 deville concours car will drive fine for awhile then it says engine coolant hot the it overheats and sometimes its says A/C compressor off i will let it cool down have to put about 1 1/2 gallons of antifreeze then same thing drive for awhile same thing i checked the oil dip stick and there is no water or coolant on it i dont know if that is a sighn of head gasket or not  i ran the codes:po36,po95,a047,ao50,to61,so30,so61 after clear the codes sometimes po36 & po95 come back but if i let it sit for a few days all these codes come up i dont know if they have anything to do with the overhaet problem  

Answer
P036 = EGR valve pintle position out of range.

P095 = Engine almost stalled.

The P036 is most likely causing the P095.

Fault is either:

EGR valve.
wiring.
PCM computer.

I can provide pictures and a diagnostic chaert so that you can test the system. E-mail me at: onlineautohelp@msn.com