At what coolant temperature do your cooling fans turn on?

[Jeep_Riot]

2015 Subaru Crosstrek.

210.20 Fahrenheit and both fans kick on. Once it drops to 203 they turn off.

They always turn on and off together. I’ve never seen one run without the other.

ETA: this is with the A/C off. If the A/C is on the fans cycle along with the compressor.

 

[demarpaint]

That seems right. AFAIK they run all the time when you turn on the AC, at least that's the case with both my Jeeps.

 

[mk378]

Many cars sense the temperature of coolant leaving the radiator, not the engine temperature. When the car has been sitting still for long enough for all the coolant in the radiator to heat up due to lack of airflow, the fans come on. The trip point for this is typically 160 F.

 

[twX]

On my 2015 WRX, the fan control isn't just based on coolant temperature. It's also based on vehicle speed, whether the car is accelerating or decelerating, and whether a/c is off or at low load or high load.

 

[SHOZ]

Hyundais come on at 204F, shut off at 194F. On my Gen Coupe the high speed fan is only for the AC high pressure and will not come on for high temp. Only one fan.

The Accent has two fans and some rather convoluted wiring for the low speed . Runs then in series for low and individually for the high speed. Separate relay to turn them on for the AC.

And even though the AC has been stripped and the pressure sensor disconnected, some times the engine cooling fan comes on when in defrost no matter what temp.

 

[slacktide_bitog]

Some of them don't turn on till past 220

With a 3800, you can't tell if it's overheating or normal and waiting for the fan to turn on

The Zetec also comes on late, going right up to the red before the fans turn on

 

[SaintElmo]

1993 Saturn SL2 226 degrees on.
Not sure of the off -195 maybe?
I keep adding coolant till the fans come on and the coolant hasn't boiled yet.
I think that is just over 65 percent coolant. Don't really remember that either.
Getting old(er) I guess.
Original fan lasted about 20 years?
Original radiator lasted till fall 2023 - about 31 years.

 

[GMBoy]

Even though it is fully design intent and nothing wrong - I still get the shakes when driving my 94 Corvette (original owner, mint condition Admiral Blue) because the low speed fan only comes on w/AC. The high speed fan won't turn on until 228...then runs and shuts off at 212 and the process keeps repeating. This is only at idle/slow speed and if hot out above 90's usually. Running on the highway it is around 190-210. They all do that and I've never overheated but it is just a bit too hot for my likes.

 

[92saturnsl2]

Many GM vehicles don't turn on till 220F or above. Most cars in my experience, measured with a scan tool turn on about 205-210F, then brings the temp down to 195 or so before shutting off. As pointed out above, newer vehicles use many different variables to go along with measured coolant temp.

 

[meep]

2018 F150 = many different variables, and the AC cycle likely puts more hours on them than the engine, and it’s surprisingly high in order to spin them up to killer death mode (high speed) - mine have only been on high (that I’ve noticed) when towing.

 

[Nick1994]

218* for my ‘96 Jeep Cherokee. But I had a manual switch installed so I can flip it on early.

 

[21_6.7f450]

235* is where they come on.

 

[paulo57509]

The Camaro is the only vehicle that I know for sure. From the EPROM programming; plus/minus some sensor fudge factor.

Fan On = 107.75 C = 225.95 F
Fan Off = 104.75 = 220.55 F

 

[21_6.7f450]

The diesels only run 185* empty. The fan only comes on with the AC. Put north of 10k on them and you hear them roar.

 

[clinebarger]

2018 F150 = many different variables, and the AC cycle likely puts more hours on them than the engine, and it’s surprisingly high in order to spin them up to killer death mode (high speed) - mine have only been on high (that I’ve noticed) when towing.

I didn't look up '18 F150 fan setup, But many cooling fans today are soft start/solid state/PWM. The inrush of current to start a fan from dead stop to full speed burns stuff up!

 

[meep]

I didn't look up '18 F150 fan setup, But many cooling fans today are soft start/solid state/PWM. The inrush of current to start a fan from dead stop to full speed burns stuff up!

There’s some thick copper running to the control module….

I did hear them kick on tonight for about 30 seconds immediately on startup as the AC kicked in. Ford does a nice job of getting white noise out of them and not small aircraft propeller sounds like the fans in the 80s did. As soon as the air got cold, after 10-15 seconds, they ramped back down. Engine was op temp, 92F outside, truck had been sitting an hour.