Thanks for the replies – I also posted one last time on the Corvette Forum and was lucky enough to be given the answer – someone posted that if the fan was stuck on one speed it was very likely the 5 amp fuse on the firewall (not in the fuse box)
Of course it wasn’t on the firewall anymore after the RHD conversion but I found the elusive bugger – it was still easier to find than to go underneath the heater box.
And the fuse was BLOWN – YIPPEE…… I put a new fuse in and all 10 speeds are working.
It was about my fourth post on the subject at corvetteforum.com and I was reluctant to post again cos I suspect it is annoying to those that have already replied etc. I’m really glad I did, I wasn’t loooking forward to removing the module or ordering it from the US and making sure it was the correct part.
Now I need to find a similar but more powerful blower because this one is doing about half what I’ll need for the Cairns summer.
I’ll post that as a new topic - there must be a Holden equivalent,must,must,must !!
EDITING HERE TO SAY – YES ! I DISCOVERED THAT A Holden WB BOLTS STRAIGHT ON.
S’nut