Actually the original parts manual lists an 83 degree thermostat if I remember correctly, but if you check my website there are both thermostats and their part numbers listed on the Murena parts page.
Just to clarify I have a 1.6, so I trust the above thermo switch will work as I believe the 1.6 and 2.2 have the same radiator.
However I guess the thermostat will be different between the 1.6 and 2.2.
No, there is no reason for different tempertaure thermostats between the two engines. They can both either use an 82 or 88 degree thermostat. I would suggest the 82 (or it might be anything between 81 and 83 degrees) thermostat is used in hotter climates such as the south of France or Italy, whilst the 88 (range 87 to 89) would be used in colder areas such as the UK or Norway for example. So the choice is yours to some extent and on where the car is being driven. Use your temperature gauge to make sure the temperture stays around the 85-90 mark in normal use. If you need it running higher or lower you select the appropriate thermostat.
Seeing your latest post, Morne, and the picture of the Dolz coolant pump, that is the pump for a 1.6 and not a 2.2 model, and this posting was specifically all about the 2.2 engine and coolant pump. Since it appears you have a Murena 1.6, that pump looks OK and the impeller which faces away from the pump body looks about right.
The 2.2 coolant pump impeller vanes should always be facing towards the pump body, therefore in the opposite way to the 1.6 pump. The impellers on the two pumps are totally different, and up to now I have not come across a 1.6 with an incorrect impeller. This topic was specifically about the 2.2 impeller because there have been some fitted which do not work, but don't mix this up with your 1.6 Murena.
As for the radiator switch to activate the radiator fan, the originally fitted one was a 95/86 degree switch, meaning it cuts in at 95 and out at 86. If you wanted it to come in earlier you could chose one such as the 87/82 switch that I mentioned, but note that means your system should never get above 87, so the thermostat in the engine would have to be an 82 because it wouldn't theoretically reach 88/89 to operate that thermostat. I say theoretically because as explained, owing to the distance and tempreature drop between the engine and radiator, the engine will always run hotter than the radiator by around 3 degrees. However, with an 87/82 switch it is likely the radiator fan will be running nearly all the time unless you run the engine so 'cold', this is not the switch you should be running in a Murena, particularly a 1.6 model. Why would you want to run an 87/82 radiator switch?
Any standard Murena whether 1.6 or 2.2 should be using the 95/86 radiator switch, with either an 82 or 88 thermostat.
But to answer your question, there are a number of different switches available from many suppliers and one example is CBS, and you can simply pick what you want, as long as it fits the radiator and fulfills the job required of it.
Roy
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