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I just replaced the thermostat and water pump in my buick lesabre so why is it still overheating

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  • 30 Answers

The radiator fins may be blocked up with dust, bugs, grass seeds or similar debris, this stops the air from flowing through it and cooling the radiator. Try blowing it out with an air hose.

Posted on May 02, 2015

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Posted on Jan 02, 2017

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  • 98 Answers

SOURCE: 1996 buick roadmaster keeps overheating:

A shotgun approach to repairs can really rack up the bills.

If your symptoms are loss of water and you have replaced the thermostat, you more than likely have an issue with steam. And that steam more than often comes from a bad head gasket. Most head gasket gasket failures seem to be confined to the water side initially, but let it go on bigger damage will occur.
You can buy a litmus test strip to dunk in the coolant. It will indicate if there are exhaust residuals in the water and thus a gasket failure.

However it may just be something simple, given that you have just about replaced everything:

have you given the radiator a good hosing inside and out?
is the radiator fan running when it should be?

Posted on Sep 07, 2008

  • 106 Answers

SOURCE: 2000 buick lesabre - water pump replacement

first disconnect the battery then check how the serpentine belt is lined up so u can take it off and put back on. Then the pump should be on the side of the motor with 9or12 bolts there could be more! after taking out take razorblad and skrap the old gasket clean wipe of then put new gasket and pump back on dont over tighten the screws cuase the pump my be aluminum.

Posted on Mar 19, 2009

  • 316 Answers

SOURCE: Overheating engine

Check your oil dipstick for coolant, or a mucky substance. Your symptoms sound like a blown head gasket.

Posted on Jun 22, 2009

wireguy212
  • 1627 Answers

SOURCE: my 98 buick century overheats i bought a brand new

You should take it to a rad shop and get the whole cooling system cleaned and flushed,then pressure tested to eliminate it before goig any furter because an y other cause of overheating is going to cost you a bundle.

Posted on Oct 23, 2009

Mustgo
  • 2359 Answers

SOURCE: THE VEHICLE IS OVERHEATING, I REPLACED THERMOSTAT

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

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Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

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A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

Posted on Dec 05, 2009

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