Thermo fan on freeway.

[aidanp96]

Hey all.

Just want to get peoples opinion.

My VR going 80-100km/h even on a cool night the thermo fan is running when traveling at said 80-100km/h. Even after stopping it take around two minutes for the fan to then turn off. I went and checked the temperature of the air coming through the radiator with my hand it it didn't seem too hot at all. The temp guage (which i recently changed the sender) says its (two lines above mid at most). I've recently changed the radiator, coolant, new radiator cap and it was bled. Everything seems to be in order. My guess is that it could be the thermo fan switch sensor that may be faulty and causing the fan to run when it doesn't need too.

Any ideas? Or is my car running perfectly normal and there isn't any issue.

Thanks in advance.

 

[mpower]

I've got a couple of LS1's - the secondary fan runs all the time with the a/c on.

Don't know if that'd be relevant to you?

 

[B-Man]

delete me........ .......... ..........

 

[B-Man]

I've got a couple of LS1's - the secondary fan runs all the time with the a/c on.

both thermo fans run when my aircon is on even if engine is cold. (VYII LS1) not sure what they do when driving as i cant hear them running

 

[Nut Kracker]

Op didn't say if he had the A/C on or not.
Check that the plug connecting to the coolant temperature sensor is connected correctly.
As far as I can recall..... If the plug isn't connected, or the sensor is faulty, the fans automatically come on.
This is a safety feature, built in to the ECU. Because if the ECU doesn't properly know the temperature of the engine,
it will automatically turn the fans on.

 

[aidanp96]

Thanks for the advice Nut Kracker + others. The A/C isn't on. I would call myself intermediate with my car knowledge and know both fans turn on with A/C.

Would the best thing to do is to just replace the sensor anyway? I have no idea how old it is and knowing how to last owner treated the car it could be from factory XD

 

[Nut Kracker]

Check and clean the connection at the sensor first and see how you go.
No need to go pulling stuff out, when it can be a simple fix.
There may even be a build up of gunk or corrosion on the plug contacts, inhibiting contact between the sensor and the plug.
It may not be what I said at all, but definitely worth a shot.

If that fails, go ahead and replace the sensor. They're not that expensive.

Edit; Hang on a sec.
I'm not entirely sure, but haven't the VR engines got 2 coolant sensors?
One for the gauge and one for the ECU?

Maybe someone else here can clarify this?

 

[aidanp96]

Check and clean the connection at the sensor first and see how you go.
No need to go pulling stuff out, when it can be a simple fix.
There may even be a build up of gunk or corrosion on the plug contacts, inhibiting contact between the sensor and the plug.
It may not be what I said at all, but definitely worth a shot.

If that fails, go ahead and replace the sensor. They're not that expensive.

Edit; Hang on a sec.
I'm not entirely sure, but haven't the VR engines got 2 coolant sensors?
One for the gauge and one for the ECU?

Maybe someone else here can clarify this?

Yes VR has two. One for guage and other for everything else. I replaced the gauge one recently. The other one is god knows how old.

 

[Nut Kracker]

Could be why the temperature gauge is working.
The other one could have a bad connection or faulty and that's why the fans are coming on.

 

[jgtoranalc]

Check and clean the connection at the sensor first and see how you go.
No need to go pulling stuff out, when it can be a simple fix.
There may even be a build up of gunk or corrosion on the plug contacts, inhibiting contact between the sensor and the plug.
It may not be what I said at all, but definitely worth a shot.

If that fails, go ahead and replace the sensor. They're not that expensive.

Edit; Hang on a sec.
I'm not entirely sure, but haven't the VR engines got 2 coolant sensors?
One for the gauge and one for the ECU?

Maybe someone else here can clarify this?

+1.... also check if the wiring connector is actually connected properly. I did my Inlet manifold gaskets and when I reassembled everything, I didn't click it in properly.