Cadillac DeVille Forum : “i've changed the radiator ,thermastat and now my engine is still running hot is ...”
i've changed the radiator ,thermastat and now my engine is still running hot is it my water pump or could it be something else i have 148000 on engine...???
my hoses swell up at the entrance point of the water pump and the thermastat and my car reaches 255 and say engine protection turn engine off....and my lights come on.....
Hi nez,
Even if you don't hear any noises (probably bearings about to go) or have water leaking from the water pump it could still be having trouble keeping up with cooling the engine. There aren't too many additional components left in the cooling system of the vehicle. However, you could have blockage in the coolant ports of the block. This doesn't happen too often, but it can happen. I would stick to replacing the water pump. Anything more should be diagnosed by your trusted mechanic.
Good luck!
hey i have worked on cadillacs for 10 years and have ran into this many times if your also has a slight miss on cold start up and is found to be in cyl 1 and then clearsup after engine gets hot more than likely you headgasket is starting to give also check the valley of your engine under the intake where your starter is visible with a flash light just under pwr str pump you may see oil this is an indication of your headbolts loosening up on their own or pulling out from head another indication of headgasket faliure during head gasket replacement head bolt threads should be drilled old and set with time serts contact any cadillac dealer and they will know what you are talking about also this is a costly repair possibly up towards $3000 or more
Yeah, that happened with my DeVille too. It wouldn't be the water pump, I had that replaced along with a new radiator. It may be a crack in your head gasket. Maybe there's a bump in your hose, just squeeze the hose to get the water running and see where that gets you.
If it's a head gasket, then it's something else.
Best of luck to you though.
that car prob. has a 4100 engine ,if so you need to have a pressure test ran on the cooling system and a compression test on the cylinders.the reason for this is that engine is aluminum,and if overheated the heads will warp,crack,or if your lucky just the head gasket will be blown.this will also check your waterpump for laeks.if it passes both those tests,tan your radiator could be clogged.
good luck