Is that housing available from GM or some after market supplier? If so, how much. You could also search the salvage yards, but usually if your SUV has crumbling plastic, the salvage yard SUV's will be in the same bad shape.

 

I wouldn't be so pessimistic about finding one of the covers in a wrecking yard. The one in my truck is doing just fine. The challenge would be removing it if the engine was sill in place.

 

Christine, in your post no. 2 above. I see the large round hole to the left. Is that the HVAC blower motor housing? What is the rectangular opening just to the right of that round opening? Is that the AC condenser opening you referred to? I live in the woods with pines, oaks, and sweet gum trees; so I am would like to check my 2003 Blazer out also.

 

Yes, the big round hole is where the blower motor mounts. The rectangular-ish opening is for the blower motor control module (More Information for AIRTEX/WELLS 4P1764) which is what is used on the Auto-HVAC (auto-temperature/climate control systems). I suspect it is some sort solid-state device. For systems without the auto-HVAC, there is (I think) no opening here where the control module is mounted and instead there is a blower-motor resistors pack (http://www.rockauto.com/en/moreinfo....353619&jsn=472) that is mounted in the top of the air box on the other side of the AC evaporator. On mine, there is just an access panel where the resistors would mount. (see pictures below)

Now, if you have a manual temperature control system, I would guess you could create an opening like there is for auto-temp motor control module and then patch it by screwing a panel back on so that you can better clean out the air box and do it again in the future.

For me, when I had the motor out, I thought I had gotten all of the needles and little ash leaves out. But then I thought that since it was easy enough to do that I might as well take the module out. Note that the picture I took was taken AFTER I thought I got all of the needles out by reaching in through the blower motor mounting hole and with my remote grabber tool.

If you also live in a place that has conifers that drop needles or trees with little leaves, I would recommend getting in there to check if many of them have accumulated.


Opening for the blower motor mount (on left) and opening for blower motor control module (for the Auto-Temp/Climate control systems) in the middle with the leaves and needles. The green marked areas are the upper and forward edge of the AC evaporator.


Access panel opening (circled in red) where blower motor resistor pack would be mounted for systems that have manual temp control as opposed to auto temp (climate) control systems. The AC evaporator is under the area colored in green and mounted vertically for horizontal airflow. BTW, removal of this access panel is useful for diagnosing a bad blend-door actuator and if necessary allows manual positioning of the blend door if the actuator is bad.

 

That's great info and tips. I live in a heavily wooded area and have many leaves falling, especially in fall and winter. Long leaf pines, Cedar trees, Poplar, Maple, Oaks, Myrtle, and so on. On top of that, the house wrens insist on trying to build nests between the radiator and AC rad. by entering through the grill. They also like to build nests in the front opening of the box frame. Easy assess to that site through the two oval openings in the front bumper. I will try to get to that rec. panel and clean it out. Great photo's. Thanks!

 

You are very welcome. I'd be very interested to hear of what you find when you explore what is in your airbox. I hope it is all easy enough to get to.

 

After studying those photo's, I have taken a look at my firewall config. on my 2003 two door and it is very different from your '99. On the left is the round housing for the HVAC blower and just to the right of that is the large 'house shaped' housing for the AC device. I am guessing the rectangular opening is under that if my Blzr has one. It is amazing how some items on the Blazer change from year to year and others stay the same. The good news is it looks to be intact and not crumbling, but I don't want to remove it in case I may cause a leak in the AC system. Lazy in SC, Jim

 

I should have mentioned my 03 Blazer LS is a basic model with no auto temp climate control, no cruise control, no power windows or door locks, no rear window W/S wiper. It does have PS, PB, auto trans, 4 WD, and G80. I often wish it had power windows and cruise!

 

Maybe you can find some information for your year that will help you get into your housing and make sure it is cleaned out. Maybe the next time you are at a wrecking yard you can poke around a similarly configured Blazer and see if there is a way to get in to clean it all out.

Good Luck.