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Read articles →A real-world repair follow-up on a Kubota M4900 that wouldn't cool even after a prior compressor fix. The owner discovers the cab switch requires removing the entire roof to swap out, then stumbles on a broken HVAC plenum box and improvises a repair with epoxy, a screw, and metal duct tape. Useful for M4900 owners facing similar AC diagnosis rabbit holes, though solutions here are DIY workarounds rather than by-the-book fixes.
An owner-operator documenting hands-on farm repairs as they unfold, with no apparent commercial affiliation.
The compressor fix did not solve it because the actual problem was a bad cab control switch, not the compressor itself.
The switch was too wide to pull out past the control panel, so the entire roof had to be removed to access and swap it, then reinstalled.
In this case a tree limb fell and broke the roof, which included part of the plenum box, creating a hole in the motor housing.
A screw was drilled through the housing, sealed with epoxy, and wrapped with metal duct tape to hold the broken piece together.
