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I have a 2000 silverado 5.3 replaced heads and thermostat, checked water pump overheats when udrive down road after 10 miles or so will not overheat at idle

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  • Chevrolet Master
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Thermostat installed right? 50/50 antifreeze and water? Radiator fins clean INSIDE? Hoses all good and not collapsing?

Posted on May 06, 2013

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Posted on Jan 02, 2017

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1999 Cadillac Eldorado ,overheating changed thermostat , overflow cap ,no white smoke coming from exhaust.hot blowing from heater


Are the cooling fans coming on ? Go under the hood in the engine compartment , with the vehicle running have some one turn on the A/C , do you see and or hear the cooling fans come on ? Could be the coolant temperature gauge is bad ! How many miles on the vehicle ? Ever have water pump replaced ?

1

Check for a loss of system pressure.
Is there a loss of system pressure?
--
Go to Step 2 yes
Go to Step 3 no

2

Inspect and repair any faulty hose connections.
Does the engine still overheat?
--
Go to Step 3 yes
System OK

3

Check for low coolant protection (-37?°C/-34?°F).
Is there low coolant protection (-37?°C/-34?°F)?
--
Go to Step 4 yes
Go to Step 5 no

4

Test solution. Replace the coolant if necessary.
Does the engine still overheat?
--
Go to Step 5 yes
System OK

5

Check the water pump belt for low tension.
Is the water pump belt tension too low?
--
Go to Step 6 yes
Go to Step 7 no

6

Replace the water pump belt tensioner.
Does the engine still overheat?
--
Go to Step 7 yes
System OK

7

Check for an inoperative thermostat bypass.
Is the thermostat bypass inoperative?
--
Go to Step 8 yes
Go to Step 9 no

8

Replace the bypass.
Does the engine still overheat?
--
Go to Step 9 yes
System OK

9

Check the water pump.
Is the water pump inoperative?
--
Go to Step 10 yes
Go to Step 11 no

10

Replace the water pump.
Does the engine still overheat?
--
Go to Step 11 yes
System OK

11

Check the radiator fins for obstruction.
Are the radiator fins obstructed?
--
Go to Step 12 yes
Go to Step 13 no

12

Inspect and clean the radiator fans.
Does the engine still overheat?
--
Go to Step 13 yes
System OK

13

Check the cooling system passage for obstruction.
Is the cooling system passage blocked?
--
Go to Step 14 yes
Go to Step 15 no

14

Inspect and flush the system. Reroute or replace the hose if necessary.
Does the engine still overheat?
--
Go to Step 15 yes
System OK

15

Check the water pump belt for damage.
Is the water pump belt damaged?
--
Go to Step 16 yes
Go to Step 17 no

16

Replace the water pump belt.
Does the engine still overheat?
--
Go to step 17 yes
System OK

17

Check the cooling fans.
Are the cooling fans inoperative?
--
Go to Step 18 yes
Go to Step 19 no

18

  1. Inspect the electrical connector. Replace if necessary.
  2. Does the engine still overheat?
--
Go to Step 19 yes
System OK

19

Check the throttle body circuit flow.
Is the throttle body circuit flow restricted?
--
Go to Step 20
Go to Step 21

20

  1. Inspect the orifice and associated hose. Replace if necessary.
  2. Does the engine still overheat?
--
Go to Step 21
System OK

21

Check for a stuck thermostat.
Is the thermostat stuck in the closed position?
--
Go to Step 22
--

22

Replace the thermostat.
Does the engine still overheat?
--
--
System OK

Sep 16, 2015 | 1999 Cadillac Eldorado

1 Answer

Water bubbling out overflow


Did you bleed the air out of the cooling system?? This is a must or it will overheat.

Mar 20, 2014 | Oldsmobile Alero Cars & Trucks

1 Answer

Monte carlo blows cold air and overheats


It really runs hot within a minute of starting ?
An engine that runs hot in a few minutes is often having problems with the water pump or a blockage in the cooling system. The thermostat does not open until 195 degrees which takes 5 or 10 miles of driving.
During that time, the water pump should be circulating coolant in the block and the heater hoses.
A leaking head gasket should be putting extra pressure into the cooling system, and-or dumping coolant into the cylinders which would come out the exhaust pipe. But it should still take a few minutes for the engine to reach the boiling point of 240 degrees.

Mar 09, 2014 | 2004 Chevrolet Monte Carlo

1 Answer

I have a 1992 Buick regal that overheats at speeds of 40 mile n hour it has a new radiator, thermos stat, has been flushed an filled and bled have not changed the water pump when it overheats all of m


It is more than likely your water pump. Can you run it in park with the radiator cap off. The cap on the radiator not the overflow tank. When the temp opens the thermostat you should see flow if the pump is good no flow it is probably bad. If you don't see flow check the upper hose for temp and the lower hose. If the upper line is barely warm and the lower hose is significantly hotter, it is either water pump or thermostat, but since you replaced the thermostat I would be back to water pump. BTW you should use either a contact thermometer or an infrared to check hoses, although it was done by hand in the old days.

Feb 28, 2013 | 1992 Buick Regal

1 Answer

98 dodge caravan overheating...heater works..checked fans they came on later but when I drove it after it cooled down and it overheated...check engine lite came on.


About the only things are the thermostat and the water pump.There could be something with the radiator but that is the rarest because the water shoots straight through.If it overheats fairly rapid,it's most likely the thermostat.Sometimes a water pump will let you go 20-30 miles before overheat.The thermostat is cheaper and easier if you're going to try it systematically.Overheat will probably cause the check engine light too.Good luck! Greg

Sep 17, 2010 | 1998 Dodge Caravan

1 Answer

My 2000 Hyundai Elantra overheats. The thermostat, radiatior, water pump, timing belt and two sensors have been replaced with new parts. What is it causing to overheat?


do a presue test after engine is at normal temp . check for any leaks but am sure you blew your head gasket long before you replaced the other parts

Jul 26, 2010 | 2000 Hyundai Elantra

1 Answer

My 2000 neon is overheating. has 60 thousand on motor. new water pump flushed radiator new thermostat. runs perfect. till about twenty miles or so down the road then overheats and boils.. cracked head?


It maybe a cracked head or head gasket or cracked block. Ask your friends for help (those with mechanical abilities) or take it to a shop. Make sure you don;t get water/ antifreeze in the oil or your whole engine will be toast.
Pull the spark plugs. the one with the cleaner/ whiter insulator is probably the bad cylinder.

Hope this helps.

Aug 09, 2009 | 2000 Dodge Neon

1 Answer

Symptoms of stuck thermostat for 2000 chev silverado


If it's stuck closed, the truck will overheat in under 10 minutes, if it's stuck open, it won't reach operating temp, gauge would show it running a bit below normal or low normal range. To check thermostat operation, remove it, drop it in a pan of boiling water, it should open right away.

Aug 03, 2009 | 2000 Chevrolet Silverado

2 Answers

2002 toyota celica gts overheats


CHECK SOME BASIC PARTS, THE THERMOSTAT AND YOUR WATER PUMP, THE THERMOSTAT MAY BE THE WRONG DEGREES OR THE WATER PUMP IS GETTING A TIRED YOU JUST HAVE TO FIGUERE OUT WHICH ONE. IS THE PROBLEM...
CHEERS..

Oct 13, 2008 | 2002 Toyota Celica

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