Expert: autohelp - 8/16/2009

Question
I have a 99 Cadillac Seville, the radiator has been replaced, reservior tank cap, I have removed thermostat and have changed the oil. The oil seams clean so I don't think it's my head gasket. When idling or in traffic it starts to get hot. The fan on right turns on one line past half on temperature gauge, but turns off when you turn car off. I have seen cars when the fan stays on to continue cooling engine when its not running. The radiator was replaced because of a crack it had . When I removed the thermostat I thought this might help the engine run cooler, but at the same time it wasn'nt overheating like it is now. I read about a possible bad heater coil. To the left of the heater coil the hose seams full and is not on the right. Idling or heavey traffic causes it to overheat. Questios; does removing the thermostat cuase any problems with this motor? Does a bad or blocked heater coil restrict the cooling of backside of engine? Are the cooling fans  working the way they should? Any information would be helpful . Thanks

Answer
Questios; does removing the thermostat cuase any problems with this motor?  YES it does, You MUST have the correct thermostat in the cooling system.


Does a bad or blocked heater coil restrict the cooling of backside of engine?  It can. Disconnect bothe heater core lines that go to the heater core and put a plastic connector in between them and attach them together thus by-passing the heater core just to see if the engine temp stays down.


Are the cooling fans  working the way they should? Any information would be helpful  Yes the are.
If you want to test them you will need to e-mail: onlineautohelp@msn.com



You can and most probably do have head gasket problems whereas the head bolts tend to tear the threads out of the aluminum engine block which is very very common on this engine and what is happening is that cylinder combustion chamber pressure is getting into the coolant passages and restricting the flow of your engine coolant which causes the engine to overheat.