Hello, I gotta 2007 Infiniti m35. I’m going to preface this by saying that it did this in the summer, but to a much lesser degree, I attribute that to the weather. Recently, the temperature outside has been dropping and this my first year with my M. Anyway, in April I put in a motorad thermostat Bc it was overheating to about 75% of the c—>h gauge (not counting the bonus space for H) it already had a motorad in it but I chose to still go with the one I had ordered (I now think that is what is going wrong) anyway, fast forward to now, I can’t drive anywhere without having the heat in full blast in order too keep the temp a little below half. I noticed something, completely different from anything I’ve seen. If I drive the hell out of it for a few seconds, that temp DROPS I mean if I gun it for 5 seconds it where it needs to be. So yesterday I put a new radiator in (didn’t cheap out on the radiator) And with the increased ability to cool, came overheating... I’m sick of this by now. I’ve bleed the system every way you can, still can’t drive two miles before the temp gets to ≈70% I’ve already ordered the OEM thermo stat (all of the parts stores sell the same motorad t-stat, just under their brand names) so I guess what I’m trying to say is am I barking up the wrong tree thinking it’s the t-stat or has anyone else had these problems, I love my M and have spent countless hours making it the most enjoyable car to drive as possible
—KEY POINTS—
-temp drops when I floor it (only if it’s above the “normal” temp
-upper hose seems to be under HIGH pressure after driving and it s hot
-Lower Hose is ambient temp(When overheating)
-I’m using conventional coolant (don’t have $ to burn if it’s gonna over heat anyway)
-new radiator yesterday
-new motorad thermostat in April AND today
-no signs of a blown head gasket
-no lights on the dash
-new radiator cap w the pressure release valve
-the fans seem to be working as they should (goes in to both speeds)
-temp seems to rise faster AND higher if the A/c is on
-High power sound system (Sony 600w 4 channel & kenwood 1000w, 2 kicker comp r 10s) Maybe something drawing power making the gauge go crazy?(I don’t think so but thought I’d put it out there)
I’m at a loss, anyone had this issue or hate that the only t-stat u can find in a pinch is f-ing motorad?