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GMC Envoy Questions

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the air cond line leaks on the drivers side along the frame rail just before it crosses to the other side.
My 2003 envoy is having the service engine soon light come on and off we already did the oil change replaced the oil and air filter and also changed the spark plugs I don't know what's wrong with it. It could it be the spark plug cable?
What seems to make the problem better or worse? its worse when I'm on the freeway
How long have you had this problem? It's been happening for about a week
engine quiet when cold but loud ticking when the engine is warm, was told it sounds like a bad lower bearing. trying to get a cost estimate
What seems to make the problem better or worse? worse as the engine gets warm
How long have you had this problem? a little over a week
This happens every time I drive it.
What seems to make the problem better or worse? nothing it is the same every time I drive it
How long have you had this problem? a few months
I need to change the camshaft positioning sensor on my 2006 GMC Envoy. I have the sensor but I don't know where it's located.
The temperature gauge for outside climate goes up and down causing the air condition to go from cool to heat and vice versa..... Plus my head lights go out...... these are two separate problems

What seems to make the problem better or worse? It happens after vehicle is driven about 30 minutes and will restart after about 30 minutes
How long have you had this problem? A few weeks
Noise is loud on/off just replaced water pump again third one in a year
The ac and heat does not come on in front or in the back what would this problem be?
While im driving the rpms will go up and accleration will decrease. I have a check engine light on with a code P0410
High beams and fog lamps are okay
The fluid is Green
It sounds like a raggedy cadillac or a old pickup truck.
Driving on highway out of nowhere wouldn't accelerate and engine reved up. Temp was okay, pulled over notice coolant bubbling never died still starts and run just 30 mph with reved engine
After replacing computer and trying all re learning sequnces the security lite does not go off.
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