I knew I shouldn’t have said "it’s been working fine ever since" siting at the shop today waiting on the wife the heat gradually disappeared, a quick Burst of revs restores heat. So presumably that tells me that the aux pump just isn’t running fast enough. Will try the suggestions but it will have to wait, I’m off to the south coast to see family and friends on Thursday. Have to be careful this time, last trip cost me £100 and had to do a "driver awareness course" Thanks for the help. BTW as a quick fix I had thought of putting a 12v feed to the pump. Is that likely to harm anything.


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