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Overheating, blowing coolant from overflow tank

Tiny
DANE DESPAW SR.
  • MEMBER
  • 2013 CHEVROLET CRUZE
  • 1.4L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 104,000 MILES
I recently did a head gasket replacement on this. Car was running fine for a couple of months. Last week it started overheating. To date I’ve replaced the thermostat, water pump, coolant reservoir tank cap and serpentine belt. It’s still losing coolant from the reservoir. It doesn’t have coolant in the oil, so I’m thinking the head gasket is still good, but don’t know what else to check. There’s no bleeder port for the coolant. Is it possible that I have air in the system and if so, how do I bleed it out?
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Tuesday, December 1st, 2020 AT 6:09 AM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 12,968 POSTS
When you replaced the head gasket did you check the head for warping or have it milled flat? If not then it could easily be a bad head gasket. A quick way to tell would be to pull the spark plugs and look at the color they are, normal plugs will be a bit dirty but one where there is any coolant getting into the cylinder will look like they have been steam cleaned and may look a bit glazed. The losing coolant and overheating both suggest that if you don't see any leaking. There are a few other tests as well some are covered here:
https://www.2carpros.com/articles/head-gasket-blown-test

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Tuesday, December 1st, 2020 AT 1:45 PM
Tiny
DANE DESPAW SR.
  • MEMBER
  • 72 POSTS
I did have the head checked at a machine shop before I put it back in the car. Also have pulled the plugs and no indication of a bad head gasket. I guess I should’ve mentioned that in my question.
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Tuesday, December 1st, 2020 AT 2:53 PM
Tiny
STEVE W.
  • MECHANIC
  • 12,968 POSTS
Okay, then I would do just the pressure testing just to be sure. I would also test the heater core for leaks the same way. Then use a thermal imager or an IR thermometer to check that the radiator doesn't have a problem and to look for any hot spots.
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Tuesday, December 1st, 2020 AT 4:06 PM

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