My first post on the dedicated board. Thanks for going to the trouble, Simon. Good to see people around who know what they're doing again..,

So, on to the question. I replaced the fuel filter on my Colt (4M40) and decided to flush the intercooler while it is off. 4e, I know you advocated the use of petrol for this. Is it OK to leave the temperature switch in, or should I take it out before flushing? I've never seen one and I'm concerned that the solvent (petrol in this case) might damage it.
Cheers
Dirk