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Old 04-12-2021, 04:00 PM   #1
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Windshield washer pump comes on with AC

It took me a while to figure out why my windshield washer fluid would pump out continuously. I finally realized when I turn AC or heat on it activates pump. If fan is on low it pumps fast but if on medium or high it trickles out. If AC and heat are off it works as it should from control on turn signal. Iíve asked a couple of mechanics and they never heard of it. Do washer pump and AC/Heat go through the same control module? Itís a 2005 E450.
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Old 04-13-2021, 10:35 AM   #2
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Sounds like you have some under-dash head-banging in your future. I had a similar issue on another vehicle (not an RV). In the process of installing aftermarket cruise control, the tech mistakenly plugged a loose wire into the nearest bare pin. It was for the fog lamps, which came on whenever I turned on the cabin fan.
I found the culprit and relocated the wire to the correct spade lug for the fog lamps. I still donít know why the fan control had an extra pin.
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Old 04-21-2021, 06:10 AM   #3
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Problem was a loose ground. Pulled the battery and found loose connection.
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Old 04-21-2021, 09:44 AM   #4
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"T",

Great find. Good story about things like that.

Back in 1972 my very first year teaching automotive we had a small Buick Opel made by Buick. The DW drove many miles (60) every day taking the kids to a sitter then to work and back again. Good fuel mileage was needed.

First issue was the starter wouldn't shut off after released from the key crank position. Very noisy and crazy. Then the wipers would stop mid window when ever you turned off the switch. They didn't park. At first I thought maybe that's how the Opel did things. Then the radio started acting funny.

Took it to my new auto shop on a Saturday and eventually traced all my electrical gremlins to a fuse panel right under the added radio antenna. The antenna installer forgot to add some type of antenna gasket to keep rain from going inside the fender. Water was running down the fender and seeping behind the fuse panel. The back side of the fuse panel was all corroded. Removed the fuse panel and cleaned everything up as well as fixing every connection. Replaced the panel and every one of my electrical gremlins disappeared. The wipers even parked as all other vehicles had done.

In technical terms we called it a, "Cross voltage event". Electrons were taking alternate paths to ground wherever the easiest path happened to be. Those lessons one never forgets. We have to keep in mind basic laws like electricity will always seek the path of least resistance. No matter where that path is even if it has to travel down another circuits positive path and therefore effects the current flow in that path.
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