I have a 94 accord ex with a v-tec engine. Sometimes my heat works but often when I turn on the car, it doedn't work. I found that if I hit a bump, the heat will come back on. Does anyone have any suggestions as to what may be the problem?

Heat works===Do you mean the blower? Need more information.

Yes...I meant to say the blower. It comes on when I hit a bump but does not work right away when I turn on the car

Could be a relay, a motor or a switch.