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The most common cause is that the wire to the thermocouple under the manifold has been burned up by the heat. Find that wire and ground it to something. I think that will cause the fan to run. I shielded mine with some aluminum foil (but you need to be careful not to ground the wire through the aluminum foil).
WRONG! You'll drain your battery to 0.just grounding the wire will cause the fan to run every time the key is switched from the "on" to"off" postion, regardless of how hot or long the engine was run, or not. the run time is about 20 minutes.
Hahaha nice!
WRONG! You'll drain your battery to 0.
sorry, but you are mistaken.
this is a common fix.
it is the way mine is wired. has never "killed" the battery. has been setup this way for about 4 years now. i have timed it. it runs about 22minutes and shut off.
Sorry Dude but I have to respond your post!
There is no timer or the like.
There is a temperature switch (located to th right of the carb by the manifold) which, once a certain temperature [it is designed for] is reached (heat around the exhaust manifold) clicks and switches to ground.
Once the engine is tuned off and the fan on, after cooling down, foremost the before mentioned exhaust manifold, and once again a certain [lower] temperature is reached this thermal switch clicks back again and the ground is open aka disconnected. Fan stops.
Depending on heat and climate it can take up to 20something minutes. Observe that in an ice cold winter it is much shorter than on a sizzling hot summer afternoon.
In principle the thermal switch is similar to your old Honeywell house thermostat. That thing ain't got a timer but clicks once the bimetal expanded or contracted moving the contacts on/off past whatever the temperature preset is. Time is irrelevant, temperature is.
However, granted there might be a safety feature that cuys off the fan after a certain time. I doubt it though.
<< SIGH...>>>
Sorry Dude, you ARE wrong. There is a timer under the passenger kick panel. Take yours off and you will see a black box that says "cooling fan Relay / timer".
Grounding the wire that would go to the temp sensor is a simple, effective workaround to a faulty sensor or burnt wire. A new sensor is $90 from Toyota. I've had mine running grounded like that for years and the fan always turns off after 15 mins. And FWIW, I've got 5 old sensors on the shelf and none of them work: 25+ years of being exposed to 300+ degrees takes its toll.
Sorry Dude but I have to respond your post!
There is no timer or the like.
There is a temperature switch (located to th right of the carb by the manifold) which, once a certain temperature [it is designed for] is reached (heat around the exhaust manifold) clicks and switches to ground.
Once the engine is tuned off and the fan on, after cooling down, foremost the before mentioned exhaust manifold, and once again a certain [lower] temperature is reached this thermal switch clicks back again and the ground is open aka disconnected. Fan stops.
Depending on heat and climate it can take up to 20something minutes. Observe that in an ice cold winter it is much shorter than on a sizzling hot summer afternoon.
In principle the thermal switch is similar to your old Honeywell house thermostat. That thing ain't got a timer but clicks once the bimetal expanded or contracted moving the contacts on/off past whatever the temperature preset is. Time is irrelevant, temperature is.
However, granted there might be a safety feature that cuys off the fan after a certain time. I doubt it though.
Try here:thanx for the info i will try to find the thermocouple 2moro and see if the wire is burnt it would be nice if i could find a pic of it so i kno what to look for tho
Sorry Dude but I have to respond your post!
There is no timer or the like.
There is a temperature switch (located to th right of the carb by the manifold) which, once a certain temperature [it is designed for] is reached (heat around the exhaust manifold) clicks and switches to ground.
Once the engine is tuned off and the fan on, after cooling down, foremost the before mentioned exhaust manifold, and once again a certain [lower] temperature is reached this thermal switch clicks back again and the ground is open aka disconnected. Fan stops.
Depending on heat and climate it can take up to 20something minutes. Observe that in an ice cold winter it is much shorter than on a sizzling hot summer afternoon.
In principle the thermal switch is similar to your old Honeywell house thermostat. That thing ain't got a timer but clicks once the bimetal expanded or contracted moving the contacts on/off past whatever the temperature preset is. Time is irrelevant, temperature is.
However, granted there might be a safety feature that cuys off the fan after a certain time. I doubt it though.
<< SIGH...>>>
Sorry Dude, you ARE wrong. There is a timer under the passenger kick panel. Take yours off and you will see a black box that says "cooling fan Relay / timer".
Grounding the wire that would go to the temp sensor is a simple, effective workaround to a faulty sensor or burnt wire. A new sensor is $90 from Toyota. I've had mine running grounded like that for years and the fan always turns off after 15 mins. And FWIW, I've got 5 old sensors on the shelf and none of them work: 25+ years of being exposed to 300+ degrees takes its toll.