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First thing to do is check the refigerant levels, your local parts store sells a gauge to do this. If the refigerant level is ok, you need to start checking the control circuits, The low pressure switch is one of the most common electrical failures. In many cases special tools and training is required to service and repair these systems, There not as simple as they used to be. Computers control just about everything these days
This is a known problem with the power steering which will probably require replacement of the power steering motor. The HHR uses an electric 12V DC motor to provide the power steering force, and they have started failing.
GM is recalling the Cobalt and other vehicles for this issue, but not yet the HHR. If you are out of warranty, you will probably be personally responsible for the cost of diagnostics and replacement.
You will probably need to contact your dealer unless you are able to replace the motor yourself. Sorry.
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