i need an expert on Radiator Fans

[Sir Stunna Lot]

so im having this issue where the radiator fan will randomly decide not to turn on.

so when the fan doesnt turn on, the temperature gauge goes crazy!
but once the fan turn on, everything is peachy again.

i need someone to explain to me, in details, which sensors causes the fan to turn on (and locations of such sensors) along with all the connectors (and location) of the all the wires that leads up to the fan. I would also like any other tips/thoughts that you think would be useful for me to trouble shoot this random fan electrical problem


thanks you!

 

[ForceFed]

First thing to check will be the fan switch located on the thermostat housing. I just delt with this same problem and was due to bad connection with the terminals on the switch. Rather than replace it I merely took small pliers and slightly bent the pins to make tighter contact. Been peachy ever since.

Can verify a faulty switch by jumping the connector with a paper clip.

 

[Sir Stunna Lot]

First thing to check will be the fan switch located on the thermostat housing. I just delt with this same problem and was due to bad connection with the terminals on the switch. Rather than replace it I merely took small pliers and slightly bent the pins to make tighter contact. Been peachy ever since.

Can verify a faulty switch by jumping the connector with a paper clip.

thanks for the reply, where is this thermostat housing fan switch?

thanks

 

[ForceFed]

Thermostat housing is underneath the intake pipe area of the engine. Here is a picture of the fan switch and connector. For how old these cars are you forget that terminals and pins can get corroded and make bad contact.

By bending the pins slightly 8* and removing and installing the connector a few times you will get a fresh contact. Worked for me, not saying this is directly your problem but an easy place to start.

By using a paper clip to jump that connector you are verifying that the switch is either faulty or just bad contact :smile:



Sorry was trying to link it from my phone, posted it wrong...

 

[Sir Stunna Lot]

Can u report the image. It doesn't work. Thanks

 

[Briank]

FYI its not a switch its a sensor so jumpering it may not be the best idea. The fan has 2 speeds, low and high. I would be looking at the fan relay.

 

[ForceFed]

Thats correct, it is a sensor believe its a NTC. But was under the assumption its parts title was the fan switch since this sensor is what activates the relay?

 

[Briank]

37760-PH7-003 SENSOR ASSY., RADIATOR FAN CONTROL (MATSUSHITA)

The fan and fan high relay is controled by the fan control unit.

37735-PR7-A01 CONTROL UNIT, RADIATOR FAN

 

[ForceFed]

Doesnt jumpering the "radiator fan control sensor" verify that the control unit and the relay is functioning properly though?

I didnt have a diagram when i tested mine so I had to just base it off of general cooling systems I have messed with before.

Was the quickest way for me to verify everything down the stream was functioning short of the high speed relay.

 

[Briank]

Doesnt jumpering the "radiator fan control sensor" verify that the control unit and the relay is functioning properly though?

I didnt have a diagram when i tested mine so I had to just base it off of general cooling systems I have messed with before.

Was the quickest way for me to verify everything down the stream was functioning short of the high speed relay.

Since the fan control is not a simple on off device jumpering only confirms that it works with the sensor at 0 ohms which is not something that happens. It does confirm the relays are working at that moment. Intermittent problem are hard to trouble shoot in person for a skilled tech and nearly impossible remotely with a unskilled person.