My heat only works sometimes. One time I will start it and it will come right on, the next time it wont. If I hit a bump it will sometimes come on till I shut the car off again. Any ideas?

SOURCE: 95 gmc runs fine till i shut it off then wont start till its cool

sounds like a crank shaft sensor

michael schultz

• 1068 Answers
• Posted on Sep 18, 2009

SOURCE: 1987 gmc jimmy wont start

yea you have no fuel and sound like a bad harness and the gm's are know for there fuel pump harness's! did you change it when you changed the pump? there is a lose connection somewhere in the fuel delivery system and it's pretty simply! i would check the fuel pump relay on the left hand side of the engine compartment and maybe even put power to the pump at the relay position "b" on the fuel pump relay harness and there should be a one pin connector to put power to also connected to the same position on the relay "b" the wire should be tan and white! good luck

SOURCE: bloower on air conditioner goes off and on intermitantly

Try looking at the fuse, maybe somethings wrong with it.