Question about 1999 Mercury Cougar

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I changed Thermostat and car is still overheating.

Could this be the water pump?

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  • marty_pelkey Feb 16, 2009

    It doesnt appear that the coolant is getting past the thermostat that i installed. When the engine heats up that hose going back to the radiator is cool and feels empty. i am thinking that should opening when it heats up just from the pressure in the system it should move some product through there or does the water pump have to be working?

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  • Mercury Master
  • 783 Answers

Yes it very well could be,the fins on the back of pump that circulate the coolant could be damaged. The only way to know for sure without disassembly would be to have a flow meter hooked up to it to measure flow.
I assume you electronic cooling fan is working?

Posted on Feb 16, 2009

  • Chuck Martin
    Chuck Martin Feb 16, 2009

    If I remember correctly that year model the water pump had plastic impellers on the water pump and they were bad about them coming loose from the shaft.

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  • 1214 Answers

SOURCE: 98 328IS OVERHEATING AFTER CHANGING THERMOSTAT

Are you putting the thermostat in correctly? It it will not work backwards.

And to confirm that there isn't a different problem, take the thermostat out all together and see if it overheats.

Engine not fully warming up is not usually caused by the thermostat. Stats usually fail closed, not open.

You will want to check the water temperature sending unit or gauge after verify the water temperature with an external calibrated thermometer. You can attach and insulate the external thermometer to the housing where thermostat is located.


Reply back what you figure out. I will be happy to help you further.

Posted on Feb 03, 2009

localwonder
  • 6784 Answers

SOURCE: 2000 Sunfire coolant problem. Engine overheating,

ok, its time for a radiator flush. there is major sludge in the internals of this radiator. Make sure the thermostat is in the correct position as well. I've seen many cars come into my shop with the thermostat inserted backwards.

Posted on Mar 13, 2009

  • 206 Answers

SOURCE: 1997 bmw z3 conv. 1.9 overheated, changed

hi jasso, I would recommend checking the water pump if you see no flow in the radiator. Make sure when you fill up the cooling system, that you fill it cold, and that the vent screw in the radiator is loose. fill system until fluid comes out the vent screw. tighten the screw, start the car and have someone run at 1500rpm and check for flow.also, make sure that you have your temp setting full hot and blower on middle speed so that you don't trap air in the heater core.

Posted on Apr 05, 2009

beduncan
  • 73 Answers

SOURCE: 2004 Pontiac Grand Prix OVERHEATING!!!

Have you shop perform a "leakdown test." You probably have a bad head gasket )or a leak in the gasket).

Posted on Aug 06, 2009

  • 2 Answers

SOURCE: BMW 525i Overheating, already changes thermostat,

Are you sure the Fan is turning to cool the Engine? If it is not coming on to cool Engine Check the Rad. cooling fan relay.

Posted on Jan 04, 2010

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