With your 4.3L S truck, two pressure switches protect the A/C system. If the A/C pressure falls below 21-25 PSI, then the A/C low pressure switch will open. This will disable the A/C compressor...
Type: Posts; User: Shrek
With your 4.3L S truck, two pressure switches protect the A/C system. If the A/C pressure falls below 21-25 PSI, then the A/C low pressure switch will open. This will disable the A/C compressor...
A device that opens / closes is a switch - which is what your 4.3 L S truck uses now in the A/C system. A sensor is a device with a varying output - which is what the 2.2 L S trucks and Camaro...
The downside to this "mechanical" fix is that the E-Fans will run continuously when the A/C is on - even at 80 MPH on the highway - when they are not needed. Also, the E-Fans would either always run...
You should be able to control the E-Fans based on ECT ... but if your Blazer has A/C you will not be able to control the E-Fans when the A/C is activated (i.e. based on A/C pressure).
For this...