radiator fans on whenever the ignition is on.

[corlon]

whenever i turn my ignition on the radiator fans come on. even at a cold start. i did a search, but couldn't find a solution. does anyone have any ideas or can post a link?

[Midias]

Is your ac on?

[GreenSolara01]

Is it hot out?

[corlon]

no the a/c is not on. no it is not hot out.

[indiglosolara]

your sensor for the fans may be bad.. its a relay so it possible that its sticking.

[corlon]

where is the sensor located?

[SleeperSolara]

where is the sensor located?

There should be a box on the left side of the radiator, check what the underside of the cover says, check the one in front of the battery too.


^^
Picture so show you somewhat where the boxes are.

[99BlackSandv6]

If the coolant temp. sensor is bad it may be telling the ecu that the engine is hot, thus turning your fans on all the time. Check the coolant temp. sensor.

[corlon]

the temp gauge in the dash reads normally. when its cold reads cold. when hot reads hot. i unplugged the temp sensor on top of the engine by the pcv valve and the check engine light comes on. so i'm guessing thats not the problem.

[Midias]

the temp gauge in the dash reads normally. when its cold reads cold. when hot reads hot. i unplugged the temp sensor on top of the engine by the pcv valve and the check engine light comes on. so i'm guessing thats not the problem.

Probably 2 sensors most cars have a fan temp switch and a gauge temp switch.

[corlon]

bump.

getting cold out again and still have the same problem. anyone else encounter this issue yet?

[Midias]

Did you check the temp switch on the bottom of the radiator as I suggested on aug19 2009?

Looks like this

[corlon]

yeah. i've gone throuugh the toyota manual and tested the sensors and relays. i think 3 different sensors can trigger the fans. everything tested normal or i'm overlooking something. the only way to shut them off while the ignition is on is to remove a relay.

[Midias]

yeah. i've gone throuugh the toyota manual and tested the sensors and relays. i think 3 different sensors can trigger the fans. everything tested normal or i'm overlooking something. the only way to shut them off while the ignition is on is to remove a relay.

is the relay stuck?

[solara90]

if you said you checked the sensor, and relays. according to the wiring diagram theres a coolant temp sensor, and water temp switches 1 & 2. I dont have a V6 so i cant really help too much.. but also check for shorts