Overheating mystery
Homerhammer
Jeeper
85 jeep CJ7 inline v6 AMC 258 i6 / 4.2l AMC 258 i6 / 4.2l
Installed new exhaust manifold due to exhaust leak, installed new water pump because it moved fan up and down when revving engine, guess bearings going out. Installed new radiator. Installed new thermostat. But now it is overheating after driving about a mile or two. My guess is that I was sold a defective water pump or thermostat, or possibly radiator. A mechanic I know said it appeared to be getting water flow thru engine because hoses were hot. You can see pressure build up when it is running with radiator cap off. Mechanic thinks it could be bad engine gasket, causing pressure to build up. I think bad thermostat. Question - What causes pressure to build up and not circulate, bad thermostat or bad engine gasket or something else.
Installed new exhaust manifold due to exhaust leak, installed new water pump because it moved fan up and down when revving engine, guess bearings going out. Installed new radiator. Installed new thermostat. But now it is overheating after driving about a mile or two. My guess is that I was sold a defective water pump or thermostat, or possibly radiator. A mechanic I know said it appeared to be getting water flow thru engine because hoses were hot. You can see pressure build up when it is running with radiator cap off. Mechanic thinks it could be bad engine gasket, causing pressure to build up. I think bad thermostat. Question - What causes pressure to build up and not circulate, bad thermostat or bad engine gasket or something else.