In Reply to: Thermostat--71c,75c, or 80c ? posted by ron on January 03, 2000 at 13:52:13:
When I first got the car,the temp was reading at approx the 1/4 mark,which to me,is running a wee bit to cool.Removed the thermostat and found that it was fitted with the 71'C range unit.
Bought an 80'C thermostat and fitted it.Now the gauge reads just a tad below the mid mark,which leaves me very pleased that I had it changed.
Did an oil change a month back and used Mobil 1 and immediately after,the temp reads a needle width below the mid mark during cruise and a tad below mid mark at idle and during traffic.I am now a Mobil 1 believer.
moots '90 520i
: New debate?--archives didn't really decide. I just changed out my thermostat as a PM step (prior to this it always stayed right at mid-point) with what i thought was the same oem 80c unit but after looking a little closer at the BavAuto catalog, i could have got 1 of 3 different thermostats, --couldn't tell what the orig one was. Now my temp gauge is reading about a needle width over the mid mark--consistently. Is it possible the one i replaced was a 71 or 75c and it's now running 5-9c hotter, or is that just the temp the thermostat opens up, and then it doesn't matter much ?
: p.s. already did wp and fan clutch in august99, and bled system completely over the past 3 days. TIA
: ron (in moderate climate VA, '89 525i-M20, C- in Thermo for Engineers-THM 350 , circa '85 )