Question about 1991 GMC K1500

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Can the fins on a water pump on a truck wear down to were it dont pump anough water though the system and keep the thermostat from opening And what are the the resons for the thermost from opening after 4 new thermostats

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

rockitman187
  • 2559 Answers

SOURCE: Thermostat for 2001 GMC Yukon XL

Not true,Although,it is located in the pump,You don't need to replace the pump if the thermostat is replace.See pix
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Posted on Jan 08, 2009

pippall
  • 1486 Answers

SOURCE: Overheating when A/C is on during extended idling.

radiator blocked try changing it.

Posted on Jun 08, 2009

  • 166 Answers

SOURCE: my 1996 jimmy is overheating

head gasket

Posted on Jun 10, 2009

motor1258
  • 6674 Answers

SOURCE: 2005 yukon denali is overheating

Start it cold with rad cap off, and heater on high heat, and let it run until you see increased flow in radiator, indicating thermostat opened & engine reached operating temperature. Rev engine slightly every once in a while and hold it there for 10-20 seconds, just to help purge air better/faster. Watch rad flow again, and wait until you see increased flow 3 or 4 times. Then top up coolant in rad to an inch or 2 from top of rad, and put cap back on. Top up return bottle to appropriate level on bottle & then try it again. If it still heats up, get back to me. Does it overheat at all times? Rad fan is good i take it?

Posted on Jul 18, 2009

  • 599 Answers

SOURCE: My 1998 gmc yukon is running hot. I dont know why.

most likely problem is that the cooling system has air trapped in it, if you can find someone with an AIRLIFT tool to bleed the system

Posted on Dec 09, 2009

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1 Answer

In cooling system the engine turns overheat in five minutes it is possible that the thermostat and thermostat valve and thermoswitch is the problem?


Thermostat most likely the culprit. Till fixed open the windows and run your heater full blast.

Could also be a bad water pump, clogged radiator internally, outer debris clogging radiator fins.

Oct 27, 2015 | Cars & Trucks

2 Answers

My 1954 shippy pick up with the thrift master engine keeps overheating and cutting out can you help please


Check the radiator level, then think very hard about replacing the thermostat, then look closely at the radiator fins - front surface, behind the grille. If all that passes but the truck still overheats, doublecheck the temperature with another gauge, then consider having the cooling system flushed (or do it yourself).

Aug 03, 2014 | Cars & Trucks

1 Answer

I have replacing a lot of parts on the coolant system. Today I drove approx 8 miles round trip and when I stopped the reservoir was boiling.


Hi Brenda,first check the thermostat,could be not opening all the way,or your water pump is bad and not circulating to keep engine cool.You can do more looking,go to wear water pump is and see if you see coolant any where or leaks on pavement below while parked.

Dec 02, 2012 | 2001 Dodge Stratus

1 Answer

1991 ford capri softtop overheating, thermostat found fully open when removed after 3km run temp 120 on gauge. no miss during run no water in oil but appear to have a blockage could this be the pump at...


Most likely is a clogged radiator. Next would be the pump fins rusting off, not allowing pumping. Both reasons would be because antifreeze was not run in the engine over the years, and rust could clog the radiator, and water would rust off the pump fins...I'm still betting on the radiator though...good luck...Chris

Oct 26, 2011 | 1991 Mercury Capri

2 Answers

1992 Jeep Cheroke Limited overheating my upper radiator hose burst yesterday morning. replaced the hose added coolant still overheating. removed the thermostat started it and it is still overheating and...


replace the cap , its allowing the system to over pressurize, also, you could have an air bubble thats moving around in the system, always make sure that you fill the radiator to just cover the radiator fins inside, this allows a place for expansion to happen. what you need to do is BURP your system, leave the cap off and start the vehicle, ( before doing this step,, make sure that you've replaced the thermostat, spring towards the motor , it only works one way!! ) once you see the fluid inside the radiator moving, it means the thermostat has opened, and your fluid level should drop down, slowly add more until the fins are just covered, and wait for it to close and recycle one more time, refill again, that should purge the system of unwanted air,, replace the cap, and fill the over flow tank to the lower level line,, and you should be set

Aug 10, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Cadillac running at 228 degrees to 240 in traffic. Will putting a cold thermostat correct this problem?


It could most certainly be a bad or stuck thermostat, but on a 1997 model, your water pump may be gone (or not circulating enough coolant).
This is why its only heating up while in traffic - there is no airflow cooling the fins of your radiator from moving at speed.
I would check this out - WHILE ENGINE IS COLD - Start the engine and then remove the radiator cap - you should see coolant circulating from the movement of the water pump. Let it run 5-10 minutes to see if the thermostat will open - if it does open, your temp gauge should come down from the opening of the thermostat

Aug 01, 2011 | 1997 Cadillac DeVille

1 Answer

I have changed the temp.senor,radiator and the thermostat my car keeps running hot why?


Some times the impellers in the water pump wear down and dont flow enough water to cool things properly.

You may want to make sure you have the air bleed out of the system.

The belt may not have enough tension to properly drive the water pump.

Is your cooling fan working properly?


These are some random things that I have ran into over the years I hope they help you some

Oct 14, 2010 | 2000 Oldsmobile Intrigue

1 Answer

Over heating.Replaced thermostat using a 192,replaced water pump,too.The temp gauge on dash, cools down in idle speed, accelerates while in D...no evident leaks yet loses coolant. NO BLOW BY, WHITE EXHAUST...


Have you pressure tested your rad cap? It may not be holding the proper pressure. Also, is the rad in good shape? Are the rad fins in good shape & is the coolant in the system circulating properly. It is possible the new water pump impellor is slipping. When engine is cool, take rad cap off & start the engine. Check for coolant circulation in the rad when thermostat opens. Is it flowing freely without restriction? Top off the coolant again , you may have a vapor lock. Hope this helps. Good luck!

Oct 05, 2010 | 2001 Chevrolet Cavalier

1 Answer

199 cadillac catera keeps overheating


Hi, the main cause of over heating is usually down to a bad thermostat what you can do to test this is remove the thermostat and then boil some water and pour into a tub then put the thermostat into the tub leave it in their for about a minute then take it out and see if the middle has opened up to allow water to pass through if it dont open then this will need replacing.

other possible causes could be:

faulty coolant bottle cap.
water leak allowing air into the system.
water pump leaking or no longer spinning.
worse case could be that the head gasket has failed and if this is the case then you need to check water pump and thermostat as these failing can cause the head gasket to fail.

let me know how you get on or if you need further assistance ok

Jun 08, 2010 | 2000 Cadillac Catera

1 Answer

Car overheats a little just a little pass half wats the problem


Could be a couple of things...cheapest first okay?

1. Low coolant level

2. Thermostat is starting to fail

3. Radiator fins are extremely dirt (wash off with hose!)

4. Fan belt/Serpentine belt is wearing out on underside (starting to slip)

5. Water pump is starting to go bad

6. Need to flush the coolant system.

Apr 23, 2010 | 2001 Chevrolet Malibu

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