Question about 1999 Pontiac Montana

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

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  • Pontiac Master
  • 10,543 Answers

The radiator may be plugged or the head gasket can let compression gasses into the radiator . To check, run the engine without the radiator cap and look in to see if there any bubbles in the coolant. If there is a lot of coolant moving in the radiator after the T/stat has opened, the water pump is ok. If not then suspect the water pump is not circulating enough water.

Posted on Nov 09, 2016

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Posted on Jan 02, 2017

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  • 74 Answers

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

Posted on Aug 26, 2008

  • 55 Answers

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

Posted on Oct 16, 2008

  • 53 Answers

SOURCE: overheating

change the vicous on the fan. ( fan clutch)

Posted on Oct 20, 2008

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.

Posted on Apr 29, 2009

Wolfman304
  • 720 Answers

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,

Posted on Aug 16, 2009

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."

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1 Answer

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Was the temp gauge doing this before the repairs ?
Does the engine feel hot when the gauge is reading hot ?
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1 Answer

My 2002 Pontiac Montana gets to hot in a short distance. I don't know what it is I have an idea it's either the thermostat or a blown head gasket not sure which one. So which one is it?


You would need to figure out if the thermostat is stuck closed, or not.
Most mechanics would either replace it or take it out and run the engine without it as a test. If the engine still overheats with the thermostat out, it could be a faulty water pump, restriction in the radiator, or other problems.
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