OK Captain I went to two dealerships and two wrecking yards both dealerships checked their computers and couldn't find a drain of any sort on the evaporator cabin for my year and make.Also at one of the two auto wrecking yards they had a 2003 blazer 4x4 4.3 liter without the engine so I was able to check it out very well no drain or anything like that but they were separated at the bottom just like mine exactly were mine was letting the water run from the case onto the frame.frame. Don't know for sure but mine is leaking from the lowest point on the cabin even if it had a drain it would still leak were it is leaking from.

 

Like I told you Captain Hook
When I was under my car couldn't find any molded drain at all.
Also at the wrecking yard had the same Blazer L/S without a engine and real easy to see the bottom of the cabin and didn't see any molded drain of any sort but the case was separated just like mine and that's were mine leaked out the condensation water rite onto the frame just as you explained with the exception no molded drain.So Captain if it is draining at the bottom of the cabin were the drain should be and draining onto the frame it should be fine and maybe the way they designed that particular model.Do you think,What do you think of it leaking out of the crack on the bottom of the cabin with no restriction would you leave it be since it seems to be working just fine.

 

I have seen it a few ways on the s-series trucks. By far the most common from my experience is simply a molded in opening in the plastic HVAC housing on the engine side of the firewall; the plastic has a slot molded into it with the sheetmetal of the firewall closing in the opening. I have also seen a little rubber tube coming out of this opening, but that was only once and I believe it was a early 2nd gen that I saw that on when I was at the local Pick-n-Pull.

As far as the location, it is directly above the passenger side frame rail where the plastic HVAC housing meets the metal firewall. I have used compressed air to blow up through the drain and then used a small piece of rigid wire bent into a small hook to reach up in and attempt to pull any debris out through the hole.

 

Like I said I have been to two dealers and with their fine little computers they cant find a drain of any sorts on the evaporator cabin.And the same with the wrecking yards very clear view but no molded drain on the 2003 S10 blazer L/S 4.3 liter 4x4 4 door because there was one same exact and everything but engine was gone giving me a uninhibited view of the case with no molded drain But I guess my question now is if it is leaking quite well and onto the frame like its supposed to and at the very bottom of the cabin shouldn't I leave it alone because it seems to be working fine just a bit different then we expected.

 

Absolutely Johnny! I completely understand your concerns. A stitch in time saves stink, black mold, getting stranded, and so on. Your condensate drain is flowing unrestricted, outside of the passenger compartment. Problem solved.


As a resident of the Motor City for 43 years. Big 3 info is "deemed reliable but not guaranteed". Horsepower ratings for insurance reasons amongst many things for various reasons. Look into John Delorean's crusade for the grand prix and the GTO. MY 1991 GMC Jimmy came from the factory with a 1992 wiring harness. My 1979 Chevy Monza came with a factory V-8 that everyone said they never put a V-8 in a Monza.


Your intelligence and thoroughness is an asset to this forum. Please stick with us and keep us posted on your future problems, solutions and improvements.

 

As I stated, it is part of the HVAC housing itself. There will be no separate part to look up. That large piece of plastic will have a small (~.25in diameter) partial hole in the location stated previously.

Maybe yours was molded incorrectly with parting flash over the opening. If that is the case, you can use a small screw driver to probe for the location (it should be soft) then clean the flash off with a small craft knife to expose the entire opening properly.

When I cleaned mine, I pulled the passenger side inner fender to gain access to the area.

Regardless, if water is draining out, you likely do not have anything to worry about.

 

You know I have checked the evaporator case thoroughly and still didn't find a drain of any kind but you know I was just looking under my hood after something you said about the firewall type you only seen once or twice.Mine is leaking right out of the case onto the frame so I am tempted to leave it alone but something you said got me wondering there is a piece of sheet metal covering a spot were I have seen drains on other vehicles it is loose on the bottom and has reddish pins that might fall out if you pry on them but the way its set up you could pry on the bottom and maybe gain access to a drain built into the firewall.Without even bothering the upper pins.I need to go back to Burien an pick up my ramps so I can get around under there.

 

JohnnyLovsey is that drain on the evaporator case on the engine side or is it on the other side towards the inner fender well or is it right in the middle.

 

Captain still thinking about what you or someone said about removing the inner fender well are you able to see the drain molded into the cabin housing without removing the inner fender well or is it just easier because its on that side of the housing.

 

Can anyone supply post or recommend a good pitcher or video of the location exactly on a 2003 Chevy Blazer 4x4 4.3 liter engine 4 door of the AC drain location on the Evaporator canister or cabin.To see It is to know it and how it works.