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Fan Switch

We are experiencing trouble with the HVAC fan switch on our Isuzu I-290. The fan will stop and then start after a few seconds or it might not start until the next day. We have replaced the HVAC relay in the fuse box, but it keeps happening. This problem means the ac, heater, & defroster do not work. Help!

Sounds like a bad blower motor. The next time it dies, keep the switch on and check for power going to the blower motor. You may want to check the ground wire on the blower motor too.