I programmed dorman fod in my 2011 hhr know car shiffs hard

By the shifter linkage at the transmission, actually under it

If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_4c166ba81493f541

Do you know if the leaks are coming from the actual lines or the fittings to where these transmission lines connect to ? If it's the fittings, you may need to replace the radiator all together since most are made of plastic and fittings are molded to them.

You might also want to take a look at 2011 Chevrolet HHR camshaft sensor location Google Search

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Outside Temperature Sensor - Chevy HHR Network

www.chevyhhr.net/forums/...hhr-4/outside-temperature-sensor-30594/

Jul 9, 2010 - I had the outside temp sensor go on my 99 Buick. I don't know where it islocated on the HHR, but it was just a plug in sensor. Take out the old, stick in the new.... 2008 HHR LS 2.2 L Auto Built: 12-19-2007. Bought: 4-26-2009 Location of the ambient engine temperature sensor.... Help ...
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I know this may sound crazy but check to be sure your oil cap is tight. A loose or missing oil cap, or any severe valve cover leak, will cause the PCV system to cycle.

Your vehicle does not have an inertia switch.

Sounds like your brake fluid is low, or one of the wheel speed sensors is dead.

Spare tire compartment.

how to change fuse box on 2007 hhr under the hood?

Check the vacuum modulator for fluid in the vacuum line. Change the transmission filter and add 2 bottles of Lucas Stop Slip.