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Hvac Controller Module


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Hey guys, been looking and trying to find an answer to this but so far no luck. Can anyone tell me if the heat/ac controller modules for 88-94 model trucks are interchangeable? I have a 90 and it only has a 3 speed fan setting and I'm wanting to have 4, plus the ability to manually turn the recirc feature on and off myself rather than the truck do it like it does in mine, since there isn't a button for it. Does anyone know if they're plug and play, or would I have to change some switches/relays (or even the blower) to get 4 speeds? It works fine as is, just wanting to upgrade if it can be easily done. Thanks for any help! :jester:

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