2001 Chevy Silverado - losing coolant

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  #1  
Old 09-08-08, 12:25 PM
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2001 Chevy Silverado - losing coolant

We have a mystery we are trying to solve with our truck, a 2001 Chevy Silverado with a small v-8. No 4 wheel drive. It keeps losing coolant from the water cooling system. There is no discernible leak, we smell no antifreeze and do not see any water leaking anywhere. There is no water in the oil and visa - versa. There is no noise coming from the water pump area. A friend has the exact same truck as ours and he replaced his water pump after having the same problem and he says his truck is still doing it. The truck does not overheat at all as we keep up with the problem. There does not appear to be any leakage from the coolant reservoir either and all the hoses check out OK.
This has us stumped and is a huge pain in the rump!

Any suggestions?
 
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Old 09-08-08, 01:04 PM
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Coolant could be leaking out onto the intake and boiling off so you cannot see it.
 
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Old 09-08-08, 02:01 PM
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Any chance it could be lost via the overflow hose on the coolant recovery tank? If so, maybe a bad radiator cap?
 
  #4  
Old 09-08-08, 02:33 PM
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Head Gasket? hopefuly not. engine missing ? pull each plug one at a time and inspect to rule out head gasket.
 
  #5  
Old 09-08-08, 08:07 PM
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Thanks you guys. We have replaced the radiator cap. The intake thought is a possibility. There may be a small leak from a hose we're not finding. The overflow tank doesn't appear to be leaking. It is not missing and there is no water in the oil or oil in the water. The plugs were changed recently and looked good.

We'll find it one of these days! Thanks again!
 
  #6  
Old 09-08-08, 08:40 PM
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with the engine cold try pressure testing the coolant system, most leaks will show up better with a cold system, in the event that it still doesn't show up then move to pressure testing with it at opperating temp. most likely it is very small leak that is evaporating instead of dripping., last small possibility is a bad thermal vac switch occasionaly one will loose a seal and allow engine vac to draw coolant when running. very rare though.

life begins when the kids leave home and the dog dies
 
  #7  
Old 09-09-08, 10:21 AM
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Thanks Speedwrench!!

I don't think he has done that yet. I will pass the info along!

Edith
 
  #8  
Old 09-13-08, 05:25 PM
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truck mech

have you looked at the exhaust does it smell of coolant. look at gm web site and see if any recall or servics bullitins.
 
  #9  
Old 09-19-08, 11:38 AM
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losing coolant

When you hear chev v-8 and coolant leak,think intake gaskets. RW
 
  #10  
Old 09-20-08, 09:17 AM
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Originally Posted by retired wrench View Post
When you hear chev v-8 and coolant leak,think intake gaskets. RW
Sounds like you have experience with this. Is it then likely to leak externally or internally, and cause that coolant smell when engine is run?, or even hydrolock same as with bad headgasket?
 
  #11  
Old 10-02-08, 07:07 AM
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coolant leak

They can leak internaly or externaly,never heard of hydrolocking on one. RW
 
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