Quote:
Originally Posted by Palf70Step
Do you still have a regular fan? If the electric fan is in addition to ur regular fan (or a secondary electric fan) than yes, do it the Vintage Air way. If it is a single electric fan (not other fans), then I would recommend it kick on by engine temp.
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No engine driven fan is installed. My truck has dual electric fans. They are on relays that activate when the relay is grounded. The ECM grounds them separately at two different temperatures. The air conditioning grounds both the relays when the air system activates the fans. The air conditioning system runs at very elevated pressures if their is no moving air through the condenser. And the pressures are even higher when it's hot out. I don't know of a single factory system that doesn't have some method of moving air through the condenser when the air is on. This is separate from the motor ECM system but either system can activate the fan(s).
I suspect this is operating correctly but wanted another opinion. Currently if you are driving at 40mph there is enough air moving through the system the fans would not activate as the air conditioning system's pressure would never rise enough to activate the high side of the trinary switch.
It's a fairly complicated system. It activates the fan((s) when the pressures are high and will not start the compressor or the fans if the pressures are to low.
Plus one fan activates when the coolant temperature is above 185 deg F and the second one comes on at 195 deg F.
Most of the Vintage Air system is plug and play. If you have electric fans it gets complicated in a hurry. The newer ECM operated the motor fans at a variable speed and the air has to be integrated to the ECM to make it work properly. The only shared connections, between the ECM/ECU and the Vintage air computer are the fans relay grounds on my system.
I have been considering putting the Air-Conditioning Gauges back on to confirm the high side pressures are what I think they are. A Vintage Air system with an engine driven fan doesn't even use the Trinary Switch. It only requires a switch that is for a low cutoff to protect the compressor.
Cheers