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
Avatar
SMOKEESDAD
  • MEMBER
  • 7 POSTS
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 29, 2020 at 10:26 PM
Advertisement
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,224 POSTS
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 2:30 AM
Avatar
SMOKEESDAD
  • MEMBER
  • 7 POSTS
no it does not lose any coolant when running, only the little bit when i first start it.
Jan 30, 2020 at 8:01 PM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,224 POSTS
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 2:12 AM
Avatar
SMOKEESDAD
  • MEMBER
  • 7 POSTS
already done that.
Feb 1, 2020 at 8:36 PM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,224 POSTS
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 2:37 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.