ACC system won't produce hot air

Have a 9000cse (1996 FTP) ACC will readily produce lovely ice cold air, but no warm air whatever I do with controls...

I suspect the internal air temperature sensor is kaput, but obviously am asking you guys because I know you know heaps more than me!

Anyone got any suggestions for:-

1/ What might be wrong (is my hunch likely to be correct) 2/ How to diagnose the fault, ie what simple tests can I do 3/ What parts I should replace.

Many thanks

Al

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Al
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