Cooling system issue?

[Murph]

98 6.5 K1500 'burb.

Left the truck running after a 5 mile trip on Tuesday morning, got in and the temp gauge was over between 210* and the next major hashmark (235*?) and the rear heat was blowing cold. Felt the upper radiator hose and while it was hot, it was also soft, so I opened the overflow tank and had a geyser of coolant...:iamwithstupid:

I can't see the "cold" mark on the overflow bottle, how far up from the bottom should there be coolant? Two days in a row the bottle looked empty, and I added about 5 or 6 pints of water.


Andy

 

[ghost183]

running hot, no heat in back, hot but soft hose, geyser..

all indicative of air in the system..

either from a 2 way leak.. allowing coolant to flow out, and air in, or.. worse yet, a bad head gasket allowing compression into the water jacket.. start looking for a coolant leak and hope its not a bad head gasket

stretch a ballon over the tank neck and see if it keeps fillin with air while the engine is running..

 

[Bullseye240]

When you fill it open the bleeder on the thermostat housing until coolant bleeds out otherwise air will remain in the system. Had the same problem in a older 4.0 Cherokee and ended up replacing the rad with a later model with a regular cap on the tank to make it work.