94 Corolla 5AFE Questions

[bubz]

While driving around noticed the temperature gauge rising.Stopped engine and checked radiator and found it to be full of water.The radiator fan not turning on.Checked/replaced fan relays, still the same.

Once I disconnect the water temperature gauge sensor(single wire on thermostat housing,correct me if I'm wrong please),the fan starts and the gauge still works.So the fan is ON always.As soon as I re-connect this wire,the fan turns OFF and the temperature starts rising.

I have also checked and tested the thermostat and it is working.So at the moment this gauge sensor wire is disconnected and the fan is left ON by removing this wire.

Can someone please explain what the problem could be?

[bluemaumau]

did you check the thermostat in hot water?id just go grab a new one there only like 30 buks

[bubz]

did you check the thermostat in hot water?id just go grab a new one there only like 30 buks

Yes,in boiling water and it did open up.Closed when left under cold water.

I will buy a new one in the morning.

Just wondering how come the gauge still operates even after removing the sensor wire.What are the wires for, going into the thermostat housing?

[Zak]

That wire will just be for the fan, when you unplug it, or open the curcit the fan will switch on. The gauge sensor will be on the head some where.

Sounds like a faulty sensor to me. you can test it with a hot air blower or some thing and see if if the contunuity (sp?) changes.

[bluemaumau]

wires for fan

[bubz]

The fan does turn ON with the AC & Heater.Only problem seems to be during normal running it won't turn ON to cool the radiator alone.

Already have a new thermostat in there.

[big_boy]

that fan is nothing to do with the AC & heater its only turns on when water temp is above 97-102`C the AC fan is on the other side of the radatior & heater fan is inside the car

also define normal running thoes fans normaly only turn on in trafic or if something is obstriction radator flow

also check your water pump & that your radator has good flow as these can sometimes affect it

also check your fan belt isent slipping

[sergei]

There is no fanbelt.
From description looks like it has bad fan thermoswitch. The one when disconnected turns on the radiator fan (gearbox side).
The AC will turn on both fans (engine and gearbox side) as the pressure switch is wired in series with thermo switch.

[pc]

that fan is nothing to do with the AC & heater its only turns on when water temp is above 97-102`C the AC fan is on the other side of the radatior & heater fan is inside the car
also define normal running thoes fans normaly only turn on in trafic or if something is obstriction radator flow
also check your water pump & that your radator has good flow as these can sometimes affect it
also check your fan belt isent slipping

The normal radiator fan can be turned on by the air conditioning, it's used to provide maximum cooling for the air-con radiator.
I have noticed that my car needs to get pretty hot before the radiator fan turns on... maybe its just not hot enough... or like Sergei says, maybe it's the thermoswitch that's faulty.

[big_boy]

yes there is a fan belt its not driveing the fan but its still there

this it what you get for putting the motor the rong way arround

as if your driveing & its over heating its normaly not just the eletric fan at fault

[Burning Angel]

id say people just call it a fan belt out of habit.

id be inclined to call it what it does ie Aircon or powersteering or alternator and waterpump. therefore an ancillary belt or in the case of the big squiggly wiggly ones a serpintine belt system.

[sergei]

It will overheat if in traffic or not moving on idle if fan is not turning on. From description - when the fan is always on it does not overheat - hence my conclusion on faulty thermoswitch.

[bubz]

Bit confused here,should it have two fans or one?I have one.

[big_boy]

douse it have air con?

the answer to this is the same answer as should it have 2 fans

[bubz]

douse it have air con?

the answer to this is the same answer as should it have 2 fans

Yes it does.

[big_boy]

you sure there not a 2nd fan on the opposit side of the radator mounted to cool the air con