I have a 1990 V8 HCPU right now
overheating of the engine when driving serious offroad.
take spare bearings for the LT85 for what they cost.
Once starting to wear out,they start sounding like a coffe grinder.
Locals will fix it very cheap when you take the spare parts(bearings& seals)
cab heating comes not from the engine but from the manifolds running under the tunnel.metal heatshield can be homemade and will bring down the temp dramatically.make shure the visco is in good shape of mount a fixed fan as your driving will be not in cold climate anyway.
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