Why does my 99 silverado have no heat and the ac fuses look good and blower motot works great
the blower motor relay is located next to the blower motor it is connected to the motor by a purple and black wires
The blower motor is located under the passenger side of the dash panel.
I think the blower motor relay is internal to the blower motor resistor which is located under the passenger side dash.
Ok..I figured it out. Turns out the rear defroster is the problem. When I unplugged it from the back windshield, blower/heater works great!! So...to all those out there..if your blower motor blows fuses...check the blower motor first...then the HVAC and heater fuses, then rear defroster if you have a cavalier!
blower motor bad or no power to it chech fuses blower switch blower motor
When the blower motor stays on it means there is a short to power, or the relay is sticking. 99.9% of the time the relay sticks. I belive on the 2004 silverados the blower motor relay is internal to the blower motor resistor. Try to find an auxillary blower motor relay and if there isn't one then replace the blower motor resistor.
AnswerIf none of the speeds work check fuses and the power at the blower motor. Since blower motors work most of the time, the blower motors do burn out. If it works on high speed only, then the blower resistor behind the glove box is possibly bad. MarkCheck the ground to the motor. Best thing to do is ground the motor and see if it works. I have seen this problem before and putting a different ground on it fixed it.
Under the passenger side of the dash
Pass side firewall.
the windings inside the blower motor can be shorted out fan will work but takes too much power could be a schafed wire as well or the blower motor could be seizing up..
If you have checked the blower motor and it does function when power is applied then I would suspect the Blower Motor Resistor Pack is defective. It is also possible the blower motor speed control is bad, but highly unlikely.
Fuses and relays are not your problem. The Blower Motor Resistor Pack is defective and needs replacing.Fuses and relays are not your problem. The Blower Motor Resistor Pack is defective and needs replacing.