[pairodice]

I was running the Genset (Kohler 20KW) yesterday and noticed the dash gauge showed it was about 250 and though this was odd.  We were sitting outside the storage building in the 90 degree heat running both A/Cs on the low setting.  The Genset did not shut down but I turned it off.  I’m suspecting the thermostat may be allowing it to get too hot - I found a thread that showed to check the temps at the thermostat and will do that this afternoon.  
I ordered a new air filter and may change out the oil but not sure what viscosity to use (15W-40 I think is in it now from about a year ago - we don’t use it very much, it has around 2500 hours on it).  We are planning a trip to TX and don’t want to run without a genset. 
I’m also suspect of the airflow from the squirrel cage blower - the blower motor and squirrel cage are working fine but not sure about the air flow - how can I test this (or is ‘hurricane’ strength as Tom put it so eloquently) good enough?  
Are there other things I can check? I was thinking of just changing the T-stat, water pump, hoses, belt, oil, all filters just for maintenance sake and don’t mind spending the $ on it… any idea of part numbers?  I’ve got the filter/belt numbers but not for the T-stat and water pump…