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Recently I replaced the coolant temp sensor that attaches to the right intake manifold (36151-MT8-003) because my 1991 Aspencade (with a 1990 motor) surges at some rpm levels with the choke on or if the idle is set higher than about 800. I read several threads that indicate this is a possible cure for surging. In doing so I discovered that what my Clymer manual calls the coolant temp sensor is not this part but the sensor that is located in the thermostat housing (37750-PC1-004) . I was a little disappointed and surprised at my ignorance because I didn't actually realize I was preparing to remove the wrong part until I disconnected the wire and realized that it was not gonna fit the new part I bought.
All this to say that I also realized that my Coolant Temp Guage on my dash doesn't work. (More disappointment and surprise at my ignorance.) In my defense, the motor never runs hot and has never overheated and the needle on the guage actually moves up a little bit whenever the key is on. And the fans work.
I assume the part #37750-PC1-004 (called the sending unit on the Cyclemax parts diagram) is not working. The needle on the temp guage never moves past the original twitch, even when I let it idle until the fans come on. If I remove this part I'm gonna replace it.
My question is this. Is a bad sending unit the only possible reason my temp guage doesn't work?
All this to say that I also realized that my Coolant Temp Guage on my dash doesn't work. (More disappointment and surprise at my ignorance.) In my defense, the motor never runs hot and has never overheated and the needle on the guage actually moves up a little bit whenever the key is on. And the fans work.
I assume the part #37750-PC1-004 (called the sending unit on the Cyclemax parts diagram) is not working. The needle on the temp guage never moves past the original twitch, even when I let it idle until the fans come on. If I remove this part I'm gonna replace it.
My question is this. Is a bad sending unit the only possible reason my temp guage doesn't work?