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<br> I have an 82 300d Turbo. The A/C blows cold, the fan seems to work in all modes. If you turn the temp dial to MAX heat, it will heat, but the intermediate settings produce only A/c air. Is this the climate control computer malfunctioning?<br> I bought the CD from the factory, but you have to have a test rig to trouble shoot the system if you do it their way. Could it just be the control wheel? I've heard you can change that alone.<br> <br> By the way, I went through the vacuum system and that is ok.<br> <br> I guess I might have to 'suck it and see' by changing the unit. I fixed my cruise control this way and it worked out, but the climate control system is more complicated