94 e34 525 temp issues. Noticed last week when it was freezing out that the temp guage would not make it to dead center and thought it was weather related. For the past two days, the guage gets barely above the blue mark, except at idle when it moves closer to center. At idle it actually jumps around a bit. Could my thermostat be stuck open or failed? Is it ok to drive it like this for a few days until I can get it to a mechanic? Other contributing factors could be type of driving: outside sales so stop and go every 5 miles so oil never gets warm, overdue for oil change, constantly running on fumes.