Looking at Youtube. The HCV looks to be hidden under the scuttle at the base of the windscreen so you wont see it in the engine compartment. Try looking at somewhere like Eurocarparts to see if they list one for your vehicle. That may confirm, or not, whether it has one.
You don't mention how old the vehicle is. How often has the coolant been changed does the coolant look in good condition? If its rusty coloured that could spell problems. I'm also tempted towards a blocked radiator. You can get some success by removing radiator and backflushing (bottom to top) with a hosepipe and see what comes out.
Thermostats are pennies. Why not change? You've nothing to loose.
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