overheating and running rough

1997 HOLDEN
230,000 MILES • 6 CYL • FWD • AUTOMATIC
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DANIELLE BELL
  • MEMBER
  • 1 POST
when engine is cool it runs fine. when engine warms up it runs real rough. also heater blows only cold air.
have changed the leads, plugs and coil pack. have flushed the radiator.
what could be wrong with it
Jun 5, 2017 at 12:37 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,711 POSTS
Hello,

It sounds like you may have a blown head gasket. this will cause the heater not to work and the coolant to be low. Here is a guide to help you test to confirm the problem

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


Please run this test and get back to us so we can continue helping you.

Cheers, Ken
Jun 8, 2017 at 4:44 AM
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