Buick Century 2001 overheating. Replaced water pump, thermostat, still overheating, it gets worse when idling, any ideas what to test next?
Radiator fan is working properly
- thebax2006Lv 76 months agoFavorite Answer
Did you run the motor for 15 minutes with the radiator cap off? You need to purge all the air bubbles from the cooling system.
If the air bubbles never quit you might have bad head gaskets.
A mechanic can do a "block test" to verify if the head gaskets are bad.Source(s): Mitsubishi Master Tech
- M.Lv 76 months ago
Does the radiator fan come on?
It should at idle if the engine is overheating.
If it doesn't work, then the fan motor is bad or the fan relay is bad or the fuse is blown or the wiring is bad. Et cetera.
-Engine overhaul mechanic and general automotive mechanic since 1972
The fan works?
Then see if there is any exhaust fume evidence in the coolant. You might have a warped aluminum cylinder head from a serious overheat and the resulting cylinder head gasket leak. Check for coolant in your oil too. The oil dipstick will have oil that looks like a banana milkshake.
The test is a chemical test. You buy the kit or have a mechanic do it.
If the cylinder head is warped, the repair is expensive. Too many people drive an overheated engine, trying to get home. It's a bad idea. If you have an overheat or oil pressure loss, get off the road immediately, park in a safe spot and shut the engine off.
Then don't start it again until you have fixed the problem.Source(s): -Engine overhaul mechanic and general automotive mechanic since 1972
- The DevilLv 76 months ago
Check the radiator fan. I suspect the fan relay is bad. Now you have a good water pump and thermostat. You only need to spend another $15 for a new fan relay.
- SSP Bowl DudeLv 76 months ago
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- RonLv 76 months ago
Test? You haven't tested anything, skipper. Find out why it isn't circulating (the cause of all overheating) and fix that.
- falconry2Lv 76 months ago
GM had huge issues with the intake manifolds going bad, so that can manifest as overheating very often. It probably isn't a head gasket but you can look up how to test for bad head gaskets. With a 2001, it certainly wouldn't hurt to change out the intake gasket as a matter of course, but I would have that at least checked next.
- martyLv 76 months ago
Overheating could be caused by a restricted radiator, which can get worse the farther you drive along. You could also have a cracked head or head gasket problems if it has over heated alot.
- 💜Lv 66 months ago
Check to see if the radiator fan is working properly z. If it isn’t, your car will overheat, especially when idle.