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The front passenger side engine cradle bolt is hidden by the front splash shield, if it is the bolt circled in red , tighten it by hand! Do not use an impact gun! That might break the cage nut loose.
If it’s just worked loose, then retorque the bolt, it should be a 21 mm head, and tighten it with a socket and ratchet, then torque wrench, set at 74 ft lbs. Then switch to a 24” breaker bar and tighten it another 180 degrees.
There is a captive nut up in there, that can break free. This happens on the rear, the bolt gets stuck to the control arm rear bushing, so it can't come out. Continued turning of the bolt breaks the nut free from it's captivity, and then the bolt/nut/bushing assembly spins.
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Fighting this very problem right now (passenger rear Arm bolt spinning)... how in the world do you get the bolt out and fix this?
Thank you both for the points in the right direction...
Was given this HHR after it sat for three years (after being driven on salted winter roads) due to the standard fuel line leaks.... got it running and now trying to pick through the multiple brake and front end issues... really hard to work on due to the corrosion from 3 years of salt working on it... really appreciate the speed at which you have responded with excellent advice.
Your welcome, I live in Canada, salted roads are normal and corrosion is a nasty thing to deal with. PB Blaster those bolts and don’t use an impact air gun, just work the bolt with a 24 “ breaker bar. After you secure that nut to stop it from spinning.