The Heater Control Switch Only Works on High on my 1999 Chevy Silverado

SOURCE: 1999 Silverado

no..but you have a fuel pump/ fuel pump relay/ and fuses....also on firewall passenger side of center is a fuel pump jumper wire to excite the fuel pump and test it...good luck

SOURCE: Heater/ac switch speeds 1 and 2 don not work in 99 Silverado

you need a resister found under your air duct by the passenger floor under dash board auto zone sells these for about 25.00 you may as well buy cabin air filters while your at it . 1 of the screws will be a pain to install back into the duct work I left mine out didn,t make a difference . you might have to order it as they are a comman item oh you will need a vacuum to clean up mess from cabin air filters .this is not a hard job .

SOURCE: 2004 chevy silverado 1500 a/c heater

when my truck is at an idle, it won't put out any heat in the cab, same thing in the summer with the A/C, what's the fix for it ?

SOURCE: 2000 Chevy Silverado 1500 The heater does not

Had the same thing happen to my truck, the blen door actuator is under the console on passenger side, but the heater core is going to be clogged if you dont have any heat coming through, but a/c works..

SOURCE: I have a 1999 chevy silverado and I need to change heater core

Not a whole lot different. Just need to keep removing plastic down at the heater until you get to the heater core. Then disconnect it on the firewall side.