Why would the heat/ac in my car work intermittently?

Question

I have a 1993 ford escort. the heat and ac only work sometimes. I changed the fuse, but that hasn't helped. What could be the problem? thanks in advance.

Answer 1

In order to get a reasonably plausible response you need to provide a more specific description of the problem.For instance if the FAN doesn't blow at times then that is likely due to a faulty blower resistor or failing fan motor or possibly a faulty/corroded connection maybe at the resistor or at the fan motor. Does the problem seem to occur at certain fan speed settings ? If so, does the fan seem to always operate on the "high" setting? If that is the case,the problem is almost certainly a faulty blower resistor. If you have the skill (or maybe a friend), I would suggest checking /replacing the resistor first. Next would be the Blower motor itself. Some can be taken apart,cleaned,lubed and reinstalled for another few years use. If that's beyond your ability just buy one at a parts store-they're relatively inexpensive (as is the resistor) and usually readily available. Hope this helps.

Answer 2

Well if you mean that the air only blows intermittently then you probably have a problem with your blower motor. Either you have a problem with the wiring where sometimes someting doesn't make good contact and your blower motor cuts out or internally your blower motor doesn't make good contact.

Answer 3

You have a short somewhere. You need to get it checked ASAP.

Answer 4

Or, you have a bad switch.
Or, you have a bad relay.
Or, you have a bad ground.
Or, you have a bad fuse.
Or, you have a bad motor.