95 hoe, First couple of days

[SunlitComet]

that s a problem. that hvac box should be putting air downward thru the vents over the drivetrain hump in the middle when that output is selected. as you see in the pic below. you would see that the box in that area is a cover for the heater core. it is likely someone kicked a hoe in it.seal it up as best as possible with no leaks and retest the airflow. if still an issue the either something is wrong with the control assy or the door motor. eventually that hole should be repaired by replacement.

 

[joeshark]

This is what it looks like with tape off. Maybe I'll have to find some kind strong glue, that'll work well with plastic. Any ideas?

Also the smoke I am to be getting still & only while starting car after its been sitting over night; its white or gray.

 

[SunlitComet]

ouch, you can plastic welding but i recommend replacing that cover.

 

[joeshark]

Yea, but where to get it, it's the question :/ the wreckers maybe

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[SunlitComet]

http://www.gmpartsgiant.com/parts/chevrolet-cover-htr~52467128.html

$40+shipping.

 

[joeshark]

Thanks allot sunlit for all the help so far I'll order the cover, hopefully that'll fix the air issue, gotta have good air flow over the winter.

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[joeshark]

Ugh wrong cover, I needed the top Half, not bottom :/ it's all good though; I bought black silicone, seems to do the job. Still looks like sealing it up has not cured the problem. The air flow has not changed. Also kind of weird, but looks like there might be what like like antifreeze in there?
So, besides the air leak; the other possible sources of problems are door motor or control assy?
What exactly are these? And which is the most likely culprit, or way to test?
Could it also be a blower motor?

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[SunlitComet]

well coolant is not a good sign at all. that usually indicates the heater core has been leaking or coolant from the hose fitting in the engine bay has seeped thru (always a better option). as far as airflow control the one that controls the output locations is the motor on the left side of the hvac box. you can see it although with some difficulty by looking above and to the accelerator pedal and cable joint. the motor controls two different linkages that operate two interacting doors inside the box. by the way the antifreeze is colored orange or green depending where in the model year your was made as the made a switch over for better stuff.if your engine bay has a sticker that says to use dexcool do not under any circumstances and anything else but that and distilled water. it is really good stuff but very sensitive to contamination of other coolants. other thing is when you mention the top half of the box, although it is still available at $77 online, that involves pulling out the whole assembly and needing to discharge the coolant and refrigeration systems as well. if you do this it is very advantageous to really give the assembly a good once over and replace the seals in the unit as well. hvac assemblies don't take well to reusing seals that have been squished heated and cooled for many years. you might even find one that has popped out on the left side of the box assembly. if the linkages i mentioned earlier are still connected and move every moment in the same direction that the mode dial would be moved from one end to the other then the control head, motor, wiring, linkages and very likely the doors are all good. try to and see what happens and we can go from there.

 

[joeshark]

Thanks sunlit. I've narrowed down the issue with 1-3 air settings not working, it is definitely the blower motor relay. $20 part. Once that starts going, settings 1-3 start going at least it is cheap & diy.
I will have to find out about heater core, or hoses; don't think any of the hoses are leaking, but wanted to change them anyhow, easier/cheapest option though. Either way, not enough to be a major concern right now. I'll monitor it. You are right about the upper plastic housing; I'm sure that won't even be an issue once the relay is replaced; the silicone will be enough to seal the entire thing more than enough

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[SunlitComet]

the relay only turns on the high speed and cuts off the other moderated speeds from getting to the motor in the process. there are other parts in the system that can cut off fan speeds and control of the motors. as always more details help narrow it down. a burned out resistor can kill speeds 1-3 as well. odds are that or the blower switch are more likely the issue while the high speed relay is very rare.