I am new to this. Here is the situation on my 1992 Volvo 240 Stn Wgn with 108K miles, few months back I pushed the odometer reset while the car was running that messed up the odo, I read some instructions on the web as to remove the instrument cluster and so on.. bottom line I messed up even more. Finally I found a instrument cluster (with much difficulty as it had to be a K39200) with much difficulty at a wrecking yard. Installed it all was well for a while and one day saw the temp guage rise. Had me worried, my mechanic has replaced thermostat, coolant, sender unit, temp comp board and the temp guage (swapped with my original one). All was well and I thought my problems were over for over three weeks, day before while driving the temp guage went up again, and as usual when I turned the heater on the temp guage went back to normal (9 oclock) position. This happened again yesterday as well. Please help me what else should I be looking for ? Thanks..