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Topic Re: NBC- Is the operation of an electrical switch impacted by heat? |
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Tony in Whittier
I installed an in-dash switch to manually control an oil cooler fan on my 88 911. It is a simple on and off switch wired to a fuse block and a relay before the fan. The switch and fan have worked great (for 24 months or so) when the car is cool and the engine is off. But lately, when I press the switch and the engine is starting to get hot (driving in stop and go traffic), the fan does not always go on. I should clarify, if I push the switch 3 or 4 times, one of the times the fan will go on. It is hard to hear the fan go on in traffic, so I can only tell by pulling over and getting out of the car for a listen. I confirmed that the fuse is not blown.
I have a jumper where I can bypass the switch. I will try that next to see if it is the switch, fan or relay that is impacted by the heat. I am not sure if a switch remote to the fan can be impacted by the heat of the engine cooler. Any risk of jumping the switch when conditions are hot?