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Welcome to the Corvair Forum!
Without knowing the history of your engine and turbocharger, the cause of a frozen turbine and impeller could be a number of things. I have attached the 1964 Corvair Supplement to the 1961 Corvair Shop Manual. The section that covers the turbocharger starts on page 9-11. You will almost certainly have to tear down the turbocharger to discover why it is not functioning and producing boost. Your comments and perhaps pictures showing what you find when examining your turbocharger might produce some helpful comments and suggestions from members of the Corvair Forum.
P.S. I also realized that the somewhere along the timeline of the life of the car, someone changed the pressure retard solenoid to a vacuum advance. Don't think this is related to my issue? But I do know I need to change that ASAP.
Functional pressure retard units are becoming harder to find. The fact that someone installed a standard vacuum advance could be an ominous sign, as if they assumed that the turbocharger had failed and was unlikely to be repaired, so they installed a vacuum advance to effectively abandon the turbo with an attempt to continue driving the car anyway! Hopefully you will find the condition of the turbocharger to be repairable so that you can get it back in service and will then have a need for a pressure retard!
You can download a wide range of technical documents and Corvair shop manuals at no cost using the following link...
Common and Useful Corvair Websites
Corvair Forum
viewtopic.php?f=225&t=6007
You may also find the attached two-part turbocharger primer to be helpful.
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Effective communication on websites like the Corvair Forum can be difficult. I would like to encourage you to expand on your initial post and tell us more about yourself, your Corvair, and your goals for your Corvair. If you can describe your personal assessment of your mechanical skills and abilities, that would help a lot. Members of the Corvair Forum love to be helpful in assisting other Corvair owners with technical support and advice, but it helps a lot if we have some understanding of your technical background and mechanical abilities, Corvair-related knowledge, etc. Helping us to know more about you and your Corvair will help us to write comments to you that are tailored to your needs and experience. Pictures are great too, because pictures of your Corvair will help us to visualize where you are with your Corvair and its condition at the present time. Knowing your location is also useful, because knowing where you live can sometimes suggest possibilities to resolve some issues or problems.
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