little bit of water seeps out the overflow on first start in the morning

2002 CHEVROLET S-10
30,000 MILES • 2.2L • 4 CYL • 2WD
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SMOKEESDAD
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When I start my truck in the morning to idle and warm up a little, just a little bit of water seeps out the overflow. it only does this when it's first started, and sometimes not at all. Would i have a thermostat sticking because once the truck is warmed up no more seeping?
Jan 30, 2020 at 6:26 AM
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STRAILER
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This sounds like the beginning of the blown head gasket. does the truck loose coolant? If so here is a guide to help confirm the issue:

https://www.2carpros.com/articles/head-gasket-blown-test

Please run down this guide and report back.
Jan 30, 2020 at 10:30 AM
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SMOKEESDAD
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no it does not lose any coolant when running, only the little bit when i first start it.
Jan 31, 2020 at 4:01 AM
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STRAILER
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Okay, it sounds like the radiator cap is bad. I would replace it and see if it still happens. Please let me know.
Feb 1, 2020 at 10:12 AM
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SMOKEESDAD
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already done that.
Feb 2, 2020 at 4:36 AM
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STRAILER
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  • ASE Certified Mechanic
When the coolant is seeping out can you try to squeeze the top radiator hose to see if the cooling system is pressurized?
Feb 3, 2020 at 10:37 AM
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