Heater fan failed 99 Chimaera
Discussion
Just had issues with my fans. I received a suggestion that the connectors may be at fault - which they were. Having fixed mine, I would try the following, assuming the fans do not come on when hot:
Turn on ignition fully. I would start with the car cold - a bit safer.
Use paper clip to short out the connections to the Otter switch.
If both fans com on, the Otter switch has had it, or its connectors need a good clean (quite likely).
If only one fan comes on, then either the fuse or relay to the other fan has gone. Swap relays over between fan circuits and check fuses.
If you hear clicking in the footwell, likely your relay is working but the connectors to the fan have corroded.
If you hear nothing, then either
(a) you have one fuse/relay for both fans (early cars only) and one of these has gone, or
(b) both fuses or relays have gone (unlikely).
Finally, fix what you can/need as above and then warm the car up. This is how to test the otter switch. This step can be done first but presumably you already know what happens when the car warms up, or you wouldn't be reading this.
In my instance it was both the otter switch and, subsequently, corroded connectors. These are found in the engine bay at the bottom of the radiator and are easy to clean. Pull them apart, use small screwdriver to pull out connectors (noting arrangement) and clean with Emery paper.
Probably doesn't make sense, but there you go. My pennies-worth.
Rich
Turn on ignition fully. I would start with the car cold - a bit safer.
Use paper clip to short out the connections to the Otter switch.
If both fans com on, the Otter switch has had it, or its connectors need a good clean (quite likely).
If only one fan comes on, then either the fuse or relay to the other fan has gone. Swap relays over between fan circuits and check fuses.
If you hear clicking in the footwell, likely your relay is working but the connectors to the fan have corroded.
If you hear nothing, then either
(a) you have one fuse/relay for both fans (early cars only) and one of these has gone, or
(b) both fuses or relays have gone (unlikely).
Finally, fix what you can/need as above and then warm the car up. This is how to test the otter switch. This step can be done first but presumably you already know what happens when the car warms up, or you wouldn't be reading this.
In my instance it was both the otter switch and, subsequently, corroded connectors. These are found in the engine bay at the bottom of the radiator and are easy to clean. Pull them apart, use small screwdriver to pull out connectors (noting arrangement) and clean with Emery paper.
Probably doesn't make sense, but there you go. My pennies-worth.
Rich
Thanks Rich for the full explanation - I think it was based on my answer to your thread about non-working cooling fans!!
This problem was the dashboard heater fan switch going doolally in the heat.
Fans are much needed right now - trying to work in a non a/c office and failing to concentrate.
This problem was the dashboard heater fan switch going doolally in the heat.
Fans are much needed right now - trying to work in a non a/c office and failing to concentrate.
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