Quote:
Originally Posted by masraum
….Dealerships would probably be inundated with calls if temp gauges and pressure gauges read accurately and instantly. Oil pressure gauges would be the worst.
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That’s what I read on the BMW forums.
Quote:
Originally Posted by cabmandone
That's really weird. I'd think at the higher speed, the air moving across the radiator would compensate for the higher speed and the slower you go, the less air moving across the radiator you'd see slightly higher temps.
I think where you put the sensor is about as good a spot as any.
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I was surprised by it as well. I took it for a spin today with the fan hardwired. It stayed at 210° on the autometer gauge and my OBD reader said 200°.
I was cruising about 60, slowed down to about 35 and floored it through fifth gear. It actually dropped 15° or more. I can only surmise it was pumping more coolant more quickly.
Quote:
Originally Posted by GH85Carrera
I presume the car came with a temp switch for a light, or sender if it had a gauge. The best place to put a new sender would be as close to the factory location as possible, it not replace the factory sender. They have engineers, and some team of engineers worked on finding the perfect spot to measure the temp.
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The factory temperature sending unit is on the back of the engine under the intake. Without taking the intake off, it’s impossible to get to it. Even if I could get to it, I don’t know if I could split it into two senders. Plus, I like torturing myself with two different readings. 😵
Quote:
Originally Posted by asphaltgambler
Optimal location is near the thermostat outlet on the front of the engine; from the top radiator hose. As for the near overheating - what vehicle / combination is it?
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It’s about as close as I can get to the thermostat. 2005 BMW 330ci. Stock engine.
If for some reason the new fan doesn’t work, I’m thinking about setting up a relay to power it. I don’t know the gauge of wire going to the fan, but they’re pretty big. The fuse is a 50 amp. Would a 50 amp relay work? What gauge wire and switch would I use? As this is a track oriented street car, looks don’t matter. The interior is stripped out anyway.
Schematic of the cooling system. My sending unit is located between the thermostat and the blade screw on the upper radiator hose.
