My mate has a Cav Turbo (93) and we're getting serious overheating going on...
Cav started to overheat about 3 months back, not a major heat but high enough for concern...
Another friend jumped in and started replacing all sorts of things, like sensors etc.... The stupidist one was to remove the stat and throw it, (after that the heat got higher)
We've been left with one last solution that I know of and that was the water pump, we replaced it & guess what, no luck!! I thought initially after that the only thing left is the expansion tank cap, would this help the poor cav to not overheat!!!
Just as we speak, my mate has just rung me and told me that the Expansion tank has just split, and the temp guage was sitting after the red marker!
as you can see this guy is in a bit of a situation, could you help??
First off, check the rad for sure. With a hot engine (not difficult in your friends case!), feel about the radiator with the palm of your hand. It should be scorching all over. Any cool patches suggests a blockage.
You could also disconnect both the rad hoses, and run a hose pipe through the top outlet. It should run out the lower outlet, quite enthusiastically.
Head gasket job is not difficult, but I wouldn't advise it if you're not very experienced with mechanics. Yes, turbo and both manifolds need to come off really. It's the sort of job that you can mess up quite easily.
I've done head 3 head gaskets with my old nova's and didn't have any problems, I do apprecialt that this has 16 valves, not eight, and lots of sensors and electrical stuff, how long do you reckon the job will take? I'm estimating that you could possibly do it in 1 day!!
i had the same overheating problems too but mine turned out to be an airlock in the cooling system,pulled the water hose off under the dizzy that goes to the heater matrix rammed the hosepipe in the hose and left it flushing through for about 20 mins,put the pipe back on started it up and its been fine ever since.just something for you to try.
Believe it or not, we've tried all that, IE the fan, turning the right direction, and checked for blockages, some guy is doing a compression check tonight so I think we'll know after that, and I'll let you know in turn!