coolant fans will not turn on

Good morning,

If you remove the plug to the coolant sensor and the fans come on, the wiring to the fans is working as it should.

I would start by replacing the coolant sensor itself and see if it works.

Does the engine reach normal operating temperature on the gauge? A bad thermostat will also cause this issue.

As far as the fans not coming on with the AC, the fans will only come on when the high side reaches 150 pounds of pressure. With the weather being colder, it may not come on.

Roy

Thank you. I will Try replacing the thermostat and temperature sensor and your right with the temperature being so cold it's hard for the van to reach really hot, but the heat is excellent. some reason coolant seems to be coming out somewhere because there's steam. I put Leak Detection Dye in the coolant that way I can find where it is leaking or coming from. Thanks for your help,Dave

You are welcome.

Always glad to help.

Roy

I found a few weeks ago that there was a small leak in radiator causing the coolant to not reach the temperature sensor could not turn on fans so, I flushed all old coolant, new radiator,new coolant and new pressure cap. Now works perfect.Thanks guys. you guys do a awesome job with what you do. Dave

You are welcome.

Always glad to help.

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Roy