coolant fans not coming on

[lydell1087]

I have a 2005 Montana, and the coolant fans are not coming on. They come on when the A.C. is on, so it seems like the circuity is good. I have replaced the temp sensor, thermostat, and fan relay. If you disconnect the battery and reconnect it then they work properly for a while. Could this be a bad ECM.

 

[melsg5]

do you have a check engine light on? do you know how hot the engine is getting without the fan coming on?

 

[lydell1087]

There is no check engine light coming on. The temp. is about 225 degrees

 

[melsg5]

unless you were unlucky enough to buy a defective new sensor the only thing left would be to use a scan tool to see if the ecm is reading the correct temperature.

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[lydell1087]

There was air in the coolant system. Bled air from coolant system car works great

 

[melsg5]

simple fix!

 

[Steelcity]

These vans are a bitch to bleed .