Thermo fan high/low speed question

[DRTE30]

Hi guys,
Newish to the legnum game,

Ive notice up hills and on hot days that the temp kicks over half way, heading towards 3/4

If I turn the AC on, the high speed fan kicks in and temp comes down below 1/2.

My question is;
Should the standard relay kick in high speed when the engine gets hot? Or is there only a low speed setting?

Ive done a quick search but no definite answer.

Plugged into a snap-on solus pro diagnostics, i can test both low and high speeds, but both are the same speed (low im assuming)

If its supposed to kick high speed in i'll start troubleshooting & order a new relay.

Cheers in advance

 

[VOLK]

I believe the fan speed is varied by the resistor, ramps up and down based on temps and road speed so it's more than just a high or low situation. Turning on ac forces one fan to run fast to pull air over the condenser. Not sure anything but evoscan/MUT-II tool can test functionality properly. Might be worthwhile testing another fan resistor.

 

[DRTE30]

Thanks for the reply, ill look into that, but I have noticed when I pull over and it is above 1/2 the fan speed sounds the same as low when the engine is normal temp, and there is a massive difference between that and AC on.
i would have thought if it got that hot then it would ramp up towards full until the temp came down.

Thanks again

 

[VOLK]

Your scan tool give you water temps?

 

[DRTE30]

Yep, was getting up to around 98 degrees C after 10 minutes of idle. Didnt get to data log while driving though.
And I dont think the fan was kicking in at that point

 

[VOLK]

Stock thermostat opens at 82 and 98 is working temp I believe. From what I recall reading on here, they tend to hover around there. I'd log some driving temps to ascertain if actually getting hot.

N.B. Can't recall 100% so don't take my vague recollections as fact

 

[AKKO]

Did a search reveal this thread...
http://www.ozvr4.com/threads/normal-behaviour-for-stock-radiator-when-tuned.15062/page-3

 

[GLen20]

I've forced the fans on through EvoScan, and the high speed mode turns both fans on to same speed (high) as when the AC is running ie: flat-out max cooling.

 

[pretzil]

Can anyone tell me if there is a feedback from the hedgehog to the ecu? Disconnecting the signal wire seems to affect idle revs and I'm not sure if it's just additional battery load

 

[DRTE30]

Thankyou AKKO, that thread is gold!

Gives me a few things to start looking at,

I feel like a no0b now, apologies for not searching deep enough