I have been researching what setpoints to use on my cooling fans and have run across some really idiotic stuff about cooling systems. So many guys think a thermostat can solve a cooling problem and swear that by changing theirs out to a lower rating it fixed the problem. And the "slow the coolant down so it has time to cool in the radiator" bullshit still persists all over the internet. It's entertaining to read some of the stuff. Some guys think they can defy the laws of physics, and some don't even believe in physics....I ignore those guys.
Anyhow, I read that a Fbody LS engine is supposed to have a 187 degree thermostat which I read from several sources. That seems fine but it wouldn't be fully open until around 197-200 degrees. So driving down the highway the engine should run in the 190-200 range unless it's really hot outside. I think the fans are locked out above a certain speed. What surprised me is the fan setpoints.. The fans are wired such that they run in series at half speed when the first setpoint is reached, and in parallel at full speed when the second setpoint is reached. Mine are wired the same way. With the A/C on the fans run at high speed.
Here's what I found for the F-body fan setpoints which seems awfully high....I know they do it for emissions....
Fan 1 on/off at: 227
Anyhow, I read that a Fbody LS engine is supposed to have a 187 degree thermostat which I read from several sources. That seems fine but it wouldn't be fully open until around 197-200 degrees. So driving down the highway the engine should run in the 190-200 range unless it's really hot outside. I think the fans are locked out above a certain speed. What surprised me is the fan setpoints.. The fans are wired such that they run in series at half speed when the first setpoint is reached, and in parallel at full speed when the second setpoint is reached. Mine are wired the same way. With the A/C on the fans run at high speed.
Here's what I found for the F-body fan setpoints which seems awfully high....I know they do it for emissions....
Fan 1 on/off at: 227
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