After 8 minutes of constant tick over it should reach 80 degrees easily or 5 miles of constant driving from cold. 7 miles in extreme cold conditions
It should settle at 85 degrees when in constant motion above 30 mph and should reach 92 degrees below that speed or in traffic conditions like traffic lights etc. At this point you will hear the fans kick in and the temperature gauge return to 85 soon afterwards.
V6 Busso's tend to run hot in all conditions.
Changing the Thermostat is one of the easiest jobs to DIY and pays for itself within a matter of a few weeks with the fuel economy savings, otherwise you are loosing money hand over fist for nothing.
1.Remove air induction tube
2. Remove the top coolant hose from the housing... A blunt flat screw driver helps to break the seal between the metal and rubber, spray a little lubricant between the two to aid removal and have a large funnel with a pipe to a bucket to catch the excess coolant.
3.Remove the three retaining bolts from the thermostat housing
4.Remove the old thermostat, it may be sticky so use the flat blade screwdriver to pry it Now use a stanley knife blade to clean off the old paper gasket from the bottom surface of the housing.
4. Make sure that you get a new paper gasket comes with the new thermostat (some don't)
fit the new gasket and fit the thermostat and re tighten the bolts.
5. Refit the hose and tighten the clip.. Now top up the expansion tank with fresh coolant and start the engine leaving the filler cap off for now.
6. Turn your interior heater to hot. Wait until the engine is warm and the coolant fan has operated twice. Now open the plastic screw on the driver's side of the top radiator to bleed any air in the system until it flows steady (quite a few turns until its nearly out).
7. Re-tighten the bleed screw and top up the coolant to correct level and now replace the filler cap...
8. Job done... have a cuppa and be proud of your work