My blower for the heat comes on when it gets ready. Most of the time it is not working. Where do i start?

When you say heat only works sometimes are you talking the blower fan only running once in a while if it is the fan your talking about it sounds like a loose connection either on the switch or possibly on the blower mother itself

there is a blower relay circuit board located right by the blower motor which sounds like your problem to me i've worked on several that had the same type problem and thats what it was. the two blower motor wires will plug into it and there are two screws that hold it on

to me it sounds like a loose wire may be exposed to metal touching that one point or another and it's definitely an intermittent problem and that's what it sounds like to me

It could be your fuse or relay or blower motor resistor

1. check to see if you have voltage to your blower motor with key on and blower motor switch selected to a speed setting
2. if you have voltage, then your blower motor is faulty
3. no voltage means that you have a blown fuse, bad relay, bad fan switch, or bad blower motor resistor.

check manual for fuse or check all fuses. tap lightly on blower with hammer. if it comes on or squeals replace blower

Try this. When the blower is not working open the hood. Locate the blower on the passenger side near the firewall. Most likely it is covered with a thin rubber piece but it may not be. Turn the key to the run position. The engine does not need to be running. Turn the blower speed switch to high. Tap the blower with the handle end of a large screw driver. If the blower starts to work replace it.

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Check fuse for blower motor, it is a 30amp fuse behind the plastic panel that is to the left of steering wheel, you must open the driver door, open up the fuse panel, I believe the 30amp is the only 30amp fuse in there, If it is blown replace it, then try the heat again. If nothing or fuse blows again, check the blower motor resistor. This is located under the glove compartment. Do a search on google if that is the case, I was able tofind a solution by putting in "blower motor resistor" ended up buying one for @ 30$.

The problem is most likely the AC compressor clutch connector. It is a one pin connector. Located under the hood, near the clutch of the AC compressor. Clean this connector, make sure there is a good connection. I had the same problem and had to fix it myself. Works fine ever since.

There is a Chance that something could have gotten up into the Cover. Got a Wal-Mart Bag in My Trucks about a Month ago. If not you are gonna need to replace that Blower Motor. They have been know to make all kinds of Noises when they get ready to Stop Working.