The carb fan isn't the cause, but increased under hood temps may have contributed to the deterioration of the rubber bits in the carb. Seems like it's time for a carb rebuild. The wire to the Thermosensor under the intake manifold is a ground; it's what controls the carb fan. Verify that blue wire is the correct wire to the thermosensor and ground it to a chassis bolt with 'Key on/Engine Off' and the fan should go on. If it doesn't there's more wrong.
Start a new thread if you need help troubleshooting the Carb Fan. There are also many threads on it.
Start a new thread if you need help troubleshooting the Carb Fan. There are also many threads on it.