My 99 Pontiac Montana Keeps running Hot.I replace the thermostat , Coolant Sensor..Is It possible that the water pump Is Bad?

SOURCE: 94 4.6 deville coolant hot,eng hot ,limp mode

pull codes from on board diagnostics turn key on not running press and hold hot button on temp and off at same time till dash lights up write down codes respond with all computer codes i will help you determine prodlem and try to fix

SOURCE: replace thermostat 2003 pontiac montana

yes but with the right shaped wrenches and tiny hands it can be done without removing the exhaust crossover pipe

SOURCE: overheating

change the vicous on the fan. ( fan clutch)

SOURCE: Pontiac Montana '99 Water Thermostat removal

Yes, it can be removed and run without the thermostat. However, your gas mileage will suffer and the heater may not work very well.

SOURCE: 1995 Toyota Camry 4 cylinder runs hot

Hi,

Firstly, ensure you have the required 'mixture' of coolant/water (must have required coolant).

Second, I would recommend you re-test all the cooling system sensors again (make sure they're within specifications), in case a new one is faulty.

Third, ensure the new thermostat was of the correct temp setting (they all differ), so that it opens at the required time. Most cooling systems operate within 90 - 100degC.

Fourth, make sure the radiator (and associated hoses) aren't blocked.

If your temp gauge is reading higher than normal, but NOT in the danger zone...then this can be considered normal (especially if you've replaced with new components) and nothing to be concerned about.

However, if the temp gauge IS in the danger zone....then this suggests the coolant is not flowing through the cooling system properly.

If all above components test ok, then it's possible your water pump may not be pumping enough volume.

Cheers,

Testimonial: "I appreciate your help...Maybe I should just relace the water pump, that would be the last thing that I would need to replace."