[sha0lin40]

Hey there.

My 04 disco ii seems to have the fans on a lot even thou ac is off. Just had head gasket replaced, water pump, grey tstat, belt done.

I swapped the grey tstat out for a oem one just to see if it was the tstat but now it comes on even more frequent. Temp gage inside the truck is in the middle. But the fans are always on. But not when turned off.

I bleeded the cooling system but still comes on after driving

Any ideas?

 

[Disco Mike]

There is a really good chance something is screwed up with the cooling system causing the fan to come on/stay on because you are running at 212 degrees and above.
As for the temp gauge staying in the middle, that doesn't tell you anything cause it will stay there from around 150 to 230 degrees, Rover uses a terrible gauge.
If you want help, PM me your number and I'll call you today.

 

[sha0lin40]

I put the grey tstat back and bleed the system using your method. I'll check later to see if the fans come on again.

I don't have access to an ultragage to IR thermometer. I might just have to bring it to a shop and have them test the radiator. The coolant sensor has already been changed.

Thanks

There is a really good chance something is screwed up with the cooling system causing the fan to come on/stay on because you are running at 212 degrees and above.
As for the temp gauge staying in the middle, that doesn't tell you anything cause it will stay there from around 150 to 230 degrees, Rover uses a terrible gauge.
If you want help, PM me your number and I'll call you today.

 

[Disco Mike]

It will nearly be cheaper to go buy your own scanner over taking it to a shop.

 

[sha0lin40]

It will nearly be cheaper to go buy your own scanner over taking it to a shop.

That's true. It doesn't come on, maybe a few times, after I put back the grey tstat. I did notice the fan starts spinning when in park and I raise the rpm. Is that normal?

I'll goto a parts store and see what I can purchase. Hopefully they will have an ultragage.

If the temps are high then it's an issue with the radiator?

I did swap out the coolant cap. I had one in my truck. I forgot I ordered one.

 

[Disco Mike]

Why an Ultra Gauge, why not a real, much more veristle scanner like a Novva, like the 3130 that will do so very much more besides just sit on the dash?
Yes, the electric fan will spin because of the air draw from the viscus fan.