Fan Relay

[Rapid]

I hane an Old Air shrouded electrical fan. One of the wires running to the fan motor gets hot enough that it has deformed the realy base and melted the plastic around the terminal on the relay.

This does not seem right.

 

[2+2GT]

I hane an Old Air shrouded electrical fan. One of the wires running to the fan motor gets hot enough that it has deformed the realy base and melted the plastic around the terminal on the relay.

This does not seem right.

It surely is not. This sort of thing is why I favor thermal-type clutch fans, no electrical system to screw up. Is the fan/relay cycling, or does it run all the time?

 

[Rapid]

it is working properly. It comes on at 180 and shuts backs off at 160. It does run most of the time these days.

 

[2+2GT]

it is working properly. It comes on at 180 and shuts backs off at 160. It does run most of the time these days.

Well, it's obviously drawing too much current. Did this wiring come with the fan?

 

[iskwezm]

what size relay?What size wiring to the fan?

 

[Rapid]

Yes,

the wiring to the fan is the part that came with the fan. I changed the temperature sensor from a stick in the radiator to one that is is the thermostat housing and that is a painless unit. The original realy was a 30/40 amp. I replaced it with a 30.

 

[Tim65GT]

Some relays are better quality than others. For a 30 amp circuit, you should use 10 ga wire and 8 ga for 40 amps. Cheap, loose or incorrectly crimped connectors are also a source of resistance, which = more current = heat = melted components and wires. If all checks out, maybe the fan motor is going bad and is drawing too much current.

I melted a 30/40A relay, but it was controlling the high speed of a taurus fan. I fixed it with a 75A relay.

 

[Rapid]

Thanks,

I'll check connectorsd etc. I thing I have 10 gauge now.

 

[BarnStang]

I just caught this very problem on the Prostreet car on the headlights-no high beams after a front end rebuild. When I checked the dimmer switch it was so hot I nearly burned my fingers on it. One crimped connection was loose/high resistance. (Painless harness=no factory dimmer plug-done by PO) THis is a really good point Tim brought out cause sometimes you can't see this problem by looking at it visually without a very close inspection. Great picture of the melted relay!