Reprogram the fan???? why do you need to do that? Crap by the time my ride is done I'll have about half the value of the car in reprograming fees!Pertums said:i wouldnt go lower than 180 on a 4.6 but that's just my opinion. also make sure you have a way to reprogram the fan on/off settings.
sgarlic said:If you go lower than 180, your car will probably LOSE HP/TQ, since the modulars are designed to make their power at "high" engine temperatures. 192-195 is not high, it's NORMAL this day in age. We're not stuck back in the 60's fellas.. let the t-stat trick go.
XXBULLETSXX said:So can anyone answer the question about the fan? Is the problem that the fan won't turn on? and if that's the problem, why?
Another issue that arises with the use of cooler thermostats is how the PCM uses the cooling fans behind the radiator to keep the engine cool. Nearly all contemporary cars now use electric fans to pull air through the radiator to cool the engine coolant. Only when the vehicle is at higher speeds (typically above 35 MPH) does the vehicle's motion naturally force air through the radiators and removes the need for the fans. Problems can even occur at higher speeds when drafting behind another vehicle and your car experiences less frontal air pressure. At lower speeds or in those special situations, the fans are necessary to keep the engine cool. However, these fans are controlled by the PCM and do not run all the time. Furthermore, the PCM typically controls the fans at two different speeds, Low Speed and High Speed. For many GM vehicles, the PCM will turn the fans to Low speed when the PCM sees the ECT reach ~215ºF and switches to High speed when the engine temperature reaches ~225ºF. Consequently, having a 180ºF thermostat will NOT have the engine running at ~180ºF when you are traveling below 35 MPH or in stop-n-go traffic. In this condition, the thermostat will be wide open, coolant racing through the radiator but without any airflow through the radiator, the coolant is not cooled down. Thus, the engine begins to superheat over the thermostat set temperature.
XXBULLETSXX said:So can anyone answer the question about the fan? Is the problem that the fan won't turn on? and if that's the problem, why?
Kilgore Trout said:It is not just fan issues. It is also that if your motor never gets up to the temperature that it was designed for it will... Hmmm, can't remember but a search of this forum will reveal the point that Gearbanger101 ALWAYS makes about this subject...
nex2nutin said:the car is designed for about 195 which is optimal. Any lower and you are wasting fuel. The higher temp is to help the car burn the fuel effiecently. With lower operating temps means more unburnt fuel, means running richer because car may not reach closed loop, means O2 sensor go bad quickly, then the CAT goes. But this is strickly an ASE answer.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?