When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hello folks. I hate to beat this to death but I recently did an evac/recharge of the a/c system because it wasn't blowing cold. I filled the system and now it blows cold. Only problem I have now is that the right side fan stays on all the time. as soon as the battery is connected. I notice if I remove the connector to the trinary switch the fan turns off............is this a sign of overcharged a/c system? Or is this the white relay everyone talks about under the front fender on driver side??
Dan,
when you say the fan is on "as soon as the battery is connected" do you mean when the ignition switch is turned to on, or are you actually talking about physically disconnecting the battery? The reason I ask is that the fan is supposed to run when AC is on and ignition is on. Try turning AC off and seeing if it runs. Also, run the simple diagnostic check on your HVAC system. I cant immediately recollect the combination of buttons to push on the heater controls, but takes about 30 seconds to do.
Yes, as soon as the battery is connected the fan comes on and stays on. Very odd. I know it is supposed to come on when a/c is on but this one is on as soon as the battery is connected. I will check for any codes in the a/c module and get back to you.
This low pressure switch is not a under pressure switch but turns on one fan at a lower freon pressure when the A/C is operated and both fans at a higher freon pressure by a sperate 4 wire pressure switch located behind the 2 wire low pressure switch
The A/C control module does not directly control the radiator fans other then the clutch engagement to bring up freon pressure
So you have 2 modes of fan control one being the A/C load demand by the freon pressure and the other being coolant fluid temperature by a separate and 3rd switch
To know if your car is modified you may find the 2 wire connector jumped , the low pressure switch may be removed or simply the connector cut off and the 2 wires spliced
Later we will go through a one or both fan operation check to ensure your engine coolant is protecting your engine