I'm having an issue with my e-fan. More specifically, the relay. With the car parked and idling, it will come up to temp and overheat because the fan doesn't kick on. I have it wired the same way I've wired a few others. A fan controller with screw-in sensor/switch (non-adjustable 185 on/175 off, or something like that), then through a standard Bosch-style 4-pin relay.
As the temp starts to rise past 185, I can reach down and lightly tap the relay and it will immediately kick on. My first, second, and third thoughts were that the relays (cheapo parts store chinesium) were bad. I've replaced it multiple times and even bench tested them. They all seemed to work perfectly. The last one, I noticed was marked as a 14v. I found another labeled as a 12v in my stash. Tested it and then installed and it did the same thing.
I thought possibly a ground wasn't making good connection, so I ran it straight to the battery (-). Problem persisted. I've back-probed the fan controller wiring, relay socket, etc and everything seems to be working ok. All wiring and connectors are tight.
Am I overlooking something obvious here? Driving the car, the problem doesn't happen often (usually, a bump in the road will cause it to switch on). I've replaced the controller, multiple relays, and l rewired it a couple times. I did just order some good quality relays, but the pin layout is different, so it won't work with the relay socket connector. I can cut out the connector and just install blade connectors on individual wires. Just haven't been in town for a week. I'll be home in 3 days and plan on getting it figured out.
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