Engine coolant constantly decreasing

Tiny
MOATAZ AHMAD SAMEH
  • MEMBER
  • 1998 MITSUBISHI MIRAGE
  • 1.5L
  • 4 CYL
  • FWD
  • MANUAL
  • 100,000 MILES
Engine coolant constantly decreasing, no sign of external leaks, passed the pressure test. What could be the cause? How could this be fixed? Is it safe to travel with the car for five hundred miles?
Sunday, September 11th, 2016 AT 1:20 PM

5 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Have you checked the radiator cap yet? You can loose a lot of coolant from a bad one and not always notice it on the ground. Also have you checked for a wet floor board inside the car. Have you checked for a bad head gasket?
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Sunday, September 11th, 2016 AT 2:48 PM
Tiny
MOATAZ AHMAD SAMEH
  • MEMBER
  • 3 POSTS
Checked the cap, and for wet floor board, all is good. Have not checked the head gasket yet. If the head gasket is the problem, I guess the coolant is mixed with the oil or enters the combustion chamber, if so is it safe to travel with the car or drive it for a while as it will take some time to get my hands on a new head gasket. Thank you.
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Sunday, September 11th, 2016 AT 9:30 PM
Tiny
SATURNTECH9
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That would be coolant getting into the combustion chamber. I would not be making any long trips if that is what it is. Did you replace the radiator cap?
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Sunday, September 11th, 2016 AT 9:39 PM
Tiny
MOATAZ AHMAD SAMEH
  • MEMBER
  • 3 POSTS
Yes, I have changed the cap. Could the coolant cause any damage in the chamber?
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Monday, September 12th, 2016 AT 2:23 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
It could effect how well the cylinder gets lubricated.
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Monday, September 12th, 2016 AT 7:13 AM

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