Question about GMC 2000 Sierra 1500 SLE

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2000 GMC Sierra SLE 5.3L overheating replaced the water pump, thermostat, fan clutch, & flushed radiator and its still overheating

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Engine too hot? Try this procedure:

  • The thermostat can be stuck close. If you feel the upper hose very hot and the lower hose cooler than normal, it may be a stuck thermostat.

  • Make sure the radiator and the overflow bottle are filled to the proper levels.

  • Bleed air from the coolant system:This is best done by running the engine with the radiator cap off until you see when the air bubbles stop coming up.

  • Check the radiator fans: The easiest way is to turn on the cars air conditioner and turn up the A/C fans. Both radiator fans should come on when the A/C starts

  • Make a pressure test by using a pressure testing tool (available at most auto parts stores). Use the pressure shown on your radiator cap. Most cars are 16 PSI or less, so don't exceed that pressure. Replace the radiator cap if it doesn't hold the pressure.

Posted on Apr 25, 2015

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Overfueling ,engine head valve adjustment , thermostat valve and old engine these are main causes of overheating

Posted on May 11, 2014

    MARWAT May 11, 2014

    and also over timing of ignition


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Here are 8 reasons a vehicle over heats. coolant level is low, you have a leak in cooling system, the cooling system may have trapped air inside, the radiator cooling fan is not working, radiator core has become plugged, bad thermostat, or bad water pump, or Your radiator cap needs to be replaced. Good-Day! this is mostly all problems with over heating. if it is a bad head gasket, you will see white smoke from tail pipe. thats because coolant is entering cylinders. as for the radiator cap have a parts store pressure test the cooling system, if they do it.

Posted on May 11, 2014

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Posted on Jan 02, 2017

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SOURCE: 2000 Maxima overheating

when you engine reaches temp do the radiator fan/s kick on?

Posted on Aug 30, 2008

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SOURCE: 1996 dodge ram 1500 overheating

Check the lower radiator hose to see if it has gone "soft" Check when the engine is cool and stopped, grasping the hose and giving it a squeeze, you should feel the presence of a "spring" in the hose. That should be there to prevent the hose from collapsing as the water pump draws coolant through it. Without the spring, the draw created by the pump intake, and the resulting venturi effect will collapse the hose, cutting off the flow.

If you find my suggestions to be helpful, please share with us some details so that others may benefit from knowing the whole story. Thank you!

Posted on Dec 26, 2008

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SOURCE: Engine overheating at high rpms

check the casting on your replacement water pump..4.0l engines require a reverse rotating water pump..may be causing your problem.

Posted on May 16, 2009

  • 1392 Answers

SOURCE: overheating problem

I would go with slowcalafl. It is either air, or a cracked head bad head gasket. Remove the radiator cap when cool. Start up the car and watch for bubble emerging from the coolant. If it continues to bubble, you have a bad head or head gasket. If not, look for improper timing as another possibility.

Posted on Jun 30, 2009

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SOURCE: My trailblazer keeps overheating and I'm not sure

There may be an obstruction in one of the hoses, there may be an air pocket in the system somewhere.
Are you sure there is actually an overheating going on? Maybe it's a bad temperature sensor or temperature gauge stepper motor.

Posted on Oct 12, 2010

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I'm having trouble with overheating my 2000 5.9L 4x4 Dodge Durango. I've replaced the thermostat,fan clutch, water pump & still running hot heater core.would flushing cooling system fix my problem

The radiator is most likely plugged. Flushing is the least expensive way to try to fix the problem. It may not clear a severely plugged radiator. Watch the lower radiator hose with the engine running. Accelerate the engine. If the hose tries to collapse, then the radiator is definitely plugged.

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have you tried to flush the system. if so you still my have be thermostat. you can check it in a pod of water with a cooking thermometer and it should at 185f of 195f depending which one u have. Brand name Stant thermostats r good. hope that helps.

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Engine is works and replaced thermostat

do any of the radiator hoses colapse ? correct mixture of antifreeze and water? you might need to have the system flushed, Is sensor bad? replaced fan clutch?

May 27, 2012 | 2002 GMC Envoy

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2000 FORD EXPEDITION OVERHEATING....changed thermostat,radiator cap, confirmed fan clutch is working, no radiator leak noted, changing coolant temperature sensor as a type...water pump not leaking or...

yes. the impellor on these engines have a tendency to come off the water pump.First you can see if the pump is working by removing a heater hose then have someone to start the engine. if the water sprays a good, solid stream out then the water pump is good. if the water just barely comes out or not at all then the pump is weak or "bad".

Aug 13, 2011 | Ford Expedition Cars & Trucks

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My 02 gmc truck will overheat when pulling a load or excessive idleing. 6.0 motor. Replace thermostat, fan clutch, water pump, flushed and blew out radiator. Still will overheat??

I would run a cylinder leak tester. It sounds to be a cylinder head gasket leak. I assume there is no oil in the anti freeze, or anti freeze in the oil? They sell these "combustion leak tester" on ebay for around $30. easy to use. If this is not problem then you will almost certainly need a new radiator

Jul 03, 2011 | 2002 GMC Sierra

1 Answer


Here are a few things to try. Check your Radiator cap pressure as a weak cap will boil over more quickly. Replace your Temperature sending unit. There may be 2, one is for the dash gauge and the other is for engine control. Unless you have other signs of overheating you may not be overheating at all, just a bad sender.

Next, the cooling fan clutch is what the fan blade is mounted on. This is checked by using a Timing light with a RPM tach made into it. The fan clutch "locks" at a variable temperature. In cold weather it slips internally. In hot weather it engages or "locks". A mechanic measures the RPM of the blade to the RPM of the engine. This tells if the fan clutch is slipping too much internally.

Before considering a new water pump try a free scan at Autozone or Oreillys. If your Catalytic converters are plugged the engine will overheat. You should have a Code for this problem in the onboard computer. About all you can try after this is to remove the Thermostat completely and see if the engine still overheats.

You will have to replace the New Thermostat again because the other engine controls will not work right without it. But without the thermostat you can test for collapsed Radiator hoses at say 2500RPM or above. Thats about all I can think of, the water pump would cost the most. The cap, sensor-sender, fan clutch, and hoses are not that expensive.

Aug 12, 2010 | 2000 Ford Expedition

1 Answer

2000 chevy silverado 5.3 replaced the thermostat and water pump and flushed the radiator still overheating

Blow out the radiator core from the engine side with compressed air to get rid of bugs and other debris. Check the fan clutch if mechanical drive. If electric fan, make sure fan(s) come on when hot. You may have combustion products entering the cooling system. Check with auto parts supplier for test kit for same or check with a well equipped shop for a similar test. Make sure that both radiator hoses are not obstructed internally. Hope some of this helps!

Jun 10, 2010 | 2000 Chevrolet Silverado

1 Answer

2000 gmc sierra 2500 the engine temp rises when stopped. It has a 6.0 V8 i also noticed the transmission temperature is going above 200degrees, thats never happened even hauling loads in texas heat

Just guessing but, I'd say either fan clutch is going bad, not turning as fast as it should be once temps go up or if you have electric fans, either fans or relays bad. I'm leaning more toward the fan clutch. The fins on the impeller of the waterpump can also wear done over time and reduce the amount of water flow.You may also want to make sure the fins in the radiator are clean and not stopping air flow. I'm assuming that when you're moving there's no problem so that should say that water pump, thermostat are doing good. Please rate this. Thanks

Jul 02, 2009 | 2000 GMC Sierra

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