My heater will not work. I have checked the power all the way to the switch and have power all the way back to the blower fan. I have even changed the switch. It has come on all by itself, but if you just flip the switch, no-go. How do you test the blower motor to see if that is the problem? The car also has air conditioning which does not work. When the fan runs, it just blows regular air. There is an electrical plug that attaches to the freon line by the rad that has no power. I wonder if the plug is supposed to have power to it to make the conditioner work?? It has a small black wire that goes to the exhaust head, and it looks like a sensor. Then the rest of the wires go around under the alternator and over to another plug. Do you know what the problem might be?
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Re: heater will not work
If you have power to it and it doesn't work, the blower motor needs to be replaced. The AC may be related.... if the blower can not come on it may interfere. If not, you will first need to have the pressures checked.
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You relay switch is stuck on. Replace it. Second thing to check is the fan switch may need to be replaced. If you turn off your engine and then back on does the heater fan go on even when it is turned off at the switch?
The brown wire at the speed switch is the power wire. Powers is then directed to the blower motor resistor throught the orange, lt blue and yellows wires. The blower motor receives power through the orange wire.
Check for power at the fuse with the key on. If there is no power the problem could be the ignition switch or the wiring in between the switch and the fuse block
Make sure the blower motor is grounded. It's mounted in a plastic case. Check the fuse. Check for power at the blower motor wire terminal with key and blower switch on. If there is none check the resistor. If there is no power there you'll have to go back to the switch.
I would venture to say that if you hit the dash and the motor started running then the problem would be in the heater control assembly mounted in the dash, like bad wire to Heater switch connection. A bad connection can jenerate a lot of heat and start melting things unless you find the problem soon enough. The switch may already be damaged inspect switches and wireing for any vissible damage and replace as required. However if everything looks ok with the heater control assembly, Their are a few more things you can check to be sure of before relpacing the heater blower motor. Turn the heater controles to the high heat and fan on high as well, settings and remove the heater blower motor pig tail and check to see if power is getting to the motor,( use a 12 volt test light at the wire harness side of this connection ) also check for power going to and leaving the blower motor resistor assembly ( mounted to the side or top of the blower motor housing ). If so equipped. If you find no power getting to the motor at this point then you will half to start working your way back through the wireing towords the heater controles until you find the problem. Using your test light. Now if you did have power going to the motor then replace the motor. Good Luck From Ernie @ RedDeer, Alberta, Canada.
ya its probly the blower motor.but can be the switch. you can check if ther is power at the motor with wire tester. test at the blower motor with switch in diff positions 2 see if it gets brighter as you turn the fan up.and if the lighter doesnt work its probly the liter. or maybe the wire came off the back of the element,
If this occurs in all positions, check fuse, check for power at the fan motor, if power in all positions replace motor. if no power at fan and fuse is good, check blower motor resistor and blower motor control switch. Replace as required