Ive recently bought a 1992 hymer based on a Fiat Ducator 2.5 TDI. It is generally running really well but the cab heater is stuck on each when the lever is set to cold. Any thoughts on how to fix would be great.
Have someone operate the lever while you look under the bonnet and observe the heater valve.. I imagine it's either a broken cable, or has come loose or the heather valve is seized... if the valve is operating then I guess it needs replacing ..
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