Hey All. Recently swap motors on a 04 Forester, w/2.5  Liter, everything went back together and runs fine but electric cooling fans on radiator come on and stay on when key is turned on. Any ideas, appreciate it.

Did you plug in the coolant temp sensor on the cross over water pipe?

Just had this issue, and that is what mine was, did not get the sensor plugged in. it is buried under there on my 99

11 hours ago, lmdew said:

Did you plug in the coolant temp sensor on the cross over water pipe?

this one is easy to miss during reassembly

 

Thanks for all the help, it was temp sensor, I missed it on reassembly.

Now I have a different problem. When cold, engine starts very hard, when cranked it sputters briefly and dies, many times until finally it starts and comes up to cold idle speed. Could this have anything to do with temp sensor being unplugged? Also, once started it runs fine, and restarts fine when warm. It seems like its not getting choked to start cold.

Thanks once again

I missed both the temp sensors up there on my 99 and it was hard to start and then would die if i tried to rev the engine. All went back to normal with everything plugged in properly. Do not know about yours

On 12/3/2018 at 10:08 AM, Wall-E said:

Thanks for all the help, it was temp sensor, I missed it on reassembly.

Now I have a different problem. When cold, engine starts very hard, when cranked it sputters briefly and dies, many times until finally it starts and comes up to cold idle speed. Could this have anything to do with temp sensor being unplugged? Also, once started it runs fine, and restarts fine when warm. It seems like its not getting choked to start cold.

Thanks once again

Try resetting the ECU and see if the problem remains. 

Cheers 

Bennie