My heater fuse blew out last week on the way to work and i pulled one from the courtesy section and then it worked fine. so later when i bought another fuse, i replaced it. It blew again.

I did notice that alot of my fuses are not the correct number (hotter), like instead of 25, there's 30 in the spot.

Will this cause them to blow quicker?

No, having a 30 in place of a 25 will not blow quicker. But it *will* smoke your wiring quicker :cry:

The wires are sized to pass a certain amount of current. Above that and they start to heat up. If they heat enough the insulation melts and havoc ensues.

Never use a higher rated fuse than specified unless you have also replaced/upgraded all of the downstream protected wiring.

In your case you have have a heater blower that is going out. If an electric motor is unable to spin fast enough it will pull more current than usual trying to spin faster. This can put you over the edge on a fuse.

When the bushings in your fan wear enough, the fan is harder to turn and draws more current as a result. As a previous poster said, you can use larger fuses but run the chance of smoking the wiring. Replacing the wiring is not easy and can be frustrating. However, replacing the heater blower is quick, easy and inexpensive. Therefore, replace the blower as a first step. Install the correct size fuse and give it a chance to see if it solves your problem. BTW, I bought a new blower motor on eBay for 8.00.

Thanks I appreciate the help. My blower is starting to make some weird sounds.

Ray

When the bushings start to fail, the usually squeal at certain speeds. They are sealed and cannot be replaced. Solution is replacing the entire blower motor which is very easy. It is an inexpensive part that is available at most auto parts stores.