Coolant Frustration - 1999 Chevy Silverado
#1
Coolant Frustration - 1999 Chevy Silverado
Although I do not see any signs of overheating and the thermostat gauge looks good, I have had the Low Coolant light come up 2 times in 3 days. After I shut off the engine and when I go to check it, it is really low in the reservoir. As the engine starts to cool, the reservoir starts to fill up. It fills up faster if I slowly open the cap to let a little air in. It's as if, the vacuum is pulling it all in. It will fill back up almost to the full line in the reservoir tank. A little history, I have recently replaced the thermostat and most recently replaced the water pump (approx a month ago). There are no signs of leaking of coolant that I can see but I do smell it coming from the engine compartment when I get out of the truck. If there is a small leak, it must be occurring while driving. Any thoughts or suggestions, would greatly appreciate it.
#4
I need to know what type of system it uses?? post a pic of the surge tank/reservoir. Include engine size
99 old body style uses a different design than a 99 new body style.
99 old body style uses a different design than a 99 new body style.
Last edited by tech2; July 1st, 2021 at 2:39 PM.
#5
search past threads in this forum: i'm unsure if this applies to 1999 or just 2001
YOU MIGHT HAVE THE FAMOUS PLASTIC HEAD GASKET PROBLEM
mexico put in plastic head gaskets (abhorible!) , then GM used used canadian recycled fluid which ate plastic (also a seedy practice). the result is: holes in plastic allow coolant to be eaten in the combustion chamber by leaking through holes in plastic - and you think your coolant keeps "going low"
the answer is: GM has replacment aluminum/plastic gaskets and says not to used the ?DEK coolant (use only non-recycled Prestone made in usa fluid with the new head gasket !)
note: i assume it's going very low (under minimum ilne) not just "being lost after topping off". if you fill to top cold, and drive until hot: then it's supposed to spill out until slightly lower than "full hot" that's it's design
YOU MIGHT HAVE THE FAMOUS PLASTIC HEAD GASKET PROBLEM
mexico put in plastic head gaskets (abhorible!) , then GM used used canadian recycled fluid which ate plastic (also a seedy practice). the result is: holes in plastic allow coolant to be eaten in the combustion chamber by leaking through holes in plastic - and you think your coolant keeps "going low"
the answer is: GM has replacment aluminum/plastic gaskets and says not to used the ?DEK coolant (use only non-recycled Prestone made in usa fluid with the new head gasket !)
note: i assume it's going very low (under minimum ilne) not just "being lost after topping off". if you fill to top cold, and drive until hot: then it's supposed to spill out until slightly lower than "full hot" that's it's design
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