I ended up getting a '90 NA that had no heat.. I exercised all the Dampener Doors with Software, and incorrectly concluded that the Core must be plugged.. After removing the Dash, and all the Heater Components, and the Core, I found that the core flowed fine.. something was wrong with the Linkage/Door Motor.. I never figured EXACTLY what was wrong with the '90 heater box. So I tossed in a heater Box Unit from the Wrecked '96 I had, and all was good .. Trying to troubleshoot the 'Climate Control System' is not high on my priority list .. Till another one goes out.. Cj
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