PROTESTtheHERO Posted October 4, 2009 Report Share Posted October 4, 2009 man i actually think its hilarious how many gm vehicles have problems with the HVAC. i must have seen 15 gm vehicles (including the 3 in my driveway right now) that have only half of the fan speeds working. for instance, in my regal i can only have my heat/ac on high, or nothing happens. the envoy, it will work up to 5 but 6 just shuts off. the chevy express 2500 is the same with heat and the AC is finished. none of the fuses are gone out of it so it must be some kind of mechanical failure in the switch or something else im not thinking of. this wasnt intended on being a help thread or anything just a bit of a rant, but if anyone knows a simple solution, im open to ideas Quote Link to comment Share on other sites More sharing options...
hotrodolds Posted October 4, 2009 Report Share Posted October 4, 2009 If the blower works only on high, the blower resistor has failed. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted October 5, 2009 Report Share Posted October 5, 2009 HVAC temperature blend doors fail alot too, but they are easy to replace. Quote Link to comment Share on other sites More sharing options...
89SupremeCutty Posted October 5, 2009 Report Share Posted October 5, 2009 i've never had that problem in the gm's i've owned. Quote Link to comment Share on other sites More sharing options...
GP1138 Posted October 5, 2009 Report Share Posted October 5, 2009 We had issues with that in the Malibu we had, but any W I've had has never had an issue like this. I'd say they're fairly solid. Now... A/C issues, that's another story. I've never had a W where the A/C worked properly until the Grand Prix GT, or now that I think about it, my '95 SE, but the dealer I bought it from had it serviced professionally before they sold it. Quote Link to comment Share on other sites More sharing options...
pitzel Posted October 21, 2009 Report Share Posted October 21, 2009 Still on the original A/C charge in my 1992. I'd much rather have GM's HVAC than any of the alternatives... Quote Link to comment Share on other sites More sharing options...
carkhz316 Posted October 21, 2009 Report Share Posted October 21, 2009 If the blower works only on high, the blower resistor has failed. YUP X2 And in regards to your Envoy only working on the last fan speed, typically on any vehicle that isn't an electric or auto climate control, the last speed (or HIGH on some) is turned on with a relay. Check for that being bad. Quote Link to comment Share on other sites More sharing options...
Regal_GS_1989 Posted October 21, 2009 Report Share Posted October 21, 2009 If the blower works only on high, the blower resistor has failed. YUP X2 And in regards to your Envoy only working on the last fan speed, typically on any vehicle that isn't an electric or auto climate control, the last speed (or HIGH on some) is turned on with a relay. Check for that being bad. First thing to check is the fuses. If it is anything like a W, there should be one fuse for the first 4 speeds, then a separate fuse for high. If that checks out, then the relay should be part of the resistor pack. I had the opposite issue last winter where the relay stuck and run constantly on high, even with the key off. So i just pulled the high speed fuse. A couple weeks later, i lost the remainder of the speeds, so I had to change the resistor pack. After that, the fan has been flawless. On another note...the replacement resistor pack I used appeared to be a much better built unit than the factory one. Here is what the replacement unit looked like And the original unit looked similar to this The replacement cost me about $20 and took just under 2 hours to replace...and that was taking my time too. Quote Link to comment Share on other sites More sharing options...
rockfangd Posted October 21, 2009 Report Share Posted October 21, 2009 i've never had that problem in the gm's i've owned. x2 on that one Quote Link to comment Share on other sites More sharing options...
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