Overheating and running rough

DANIELLE BELL

MEMBER
1997 HOLDEN
6 CYL
FWD
AUTOMATIC
230,000 MILES

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

Monday, June 5th, 2017 AT 7:37 PM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
42,959 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