[DMCForum] Re: BUMP - No air blows when on vent, heater, or defrost

["Joe OBrien" <joeyoseppijoe@xxxxxxxxx>]

Correct, the mode switch hisses a bit when changing selections, but 
possibly there can be some damaged parts to the diaphram inside. 
Maybe the areas that direct the vacuum to control the heating?

If you gonna be in there, I'd order the HCR diaphram from Grady to 
replace it.


Joe


--- In DMCForum@xxxxxxxxxxxxxxx, "lakelanier20" <derek4567@xxxx> 
wrote:
> 
> Joe, Rich, & Elvis,
>  
>     Thanks so much for your responses.  I think no one saw my 
> earlier post because I made it during late afternoon on a Friday.  
I 
> guess people are out living their "real" lives on a Friday evening 
> rather than sitting on this forum. Hahaha.
> 
> Joe, I'm not sure the diaphragm of my mode switch would be my 
> problem, as I have no hissing when off as you described.  It only 
> makes a slight hissing noise when changing modes, which is normal, 
> right?  But if I open it to check the electrical contacts, I'll 
take 
> a look at it.
> 
> Rich, when I switch to Vent, Heater of Def the fan motor shuts 
down.
> As far as I can tell, no air is coming out of the floor.  My temp 
> knob does have resistance, so I think the cable is ok.  I'll check 
> if the heater core is clogged and the valve in the engine 
> compartment.
> 
> Elvis, I bought my car in Houston in the middle of the summer.  
The 
> fan obviously worked because I ran the air conditioning during the 
> test drive, but checking if the heating worked was the absolute 
last 
> thing on my mind.  Summer + Houston = Really Hot Outside
> I will definitely take a look at the electrical contacts on the 
mode 
> switch.  But what you were saying about Fuse 18, there's nothing 
> wrong with that fuse, right?  The problem is more likely in the 
mode 
> switch, as you said?
> Also, I bought all 3 manuals 4 months before I got the car, but 
I'm 
> not as mechanically inclined as you.  You're the guy with this 
> website, right? With the lift in the garage and everything? 
> (down at the moment)
> http://retroserver.no-ip.com/
> I used your front speaker replacement how-to.  It was very helpful.
> 
> Alright, I'll check out the stuff you guys suggested.  
> 
> Thanks again,
> -Derek L
> VIN 5302
> 
> 
> 
> 
> ------------------------------------------------------------------
> 
> --- In DMCForum@xxxxxxxxxxxxxxx, "Joe OBrien" <joeyoseppijoe@xxxx> 
> wrote:
> > 
> > That is exactly the same issue I half to fix on #2524
> > 
> > All my setting worked just fine, but I had a slight hissing on 
the 
> > mode switch when off. In my quest to make everything prefect on 
> the car I had to rebuild the mode switch, but for some reason when 
I 
> was doing it the cheap jew in me decided to regrease the old mode 
> switch diaphram.
> > 
> > I should have just bought one of grady's new mode switc 
diaphrams. 
> > I used petroleum jelly to moisten the disc to rejuvenate it. But 
> the first time I used TO much. I was paranoid it would dry out 
soon 
> > again, and didn't think to consider that ari needs to travel 
> around those diaphram passages, hence the first rebuild didn't 
work. 
> Second time I disasembled it again, wiped a good majority of the 
> petroleum jelly off, and reassembled it. Everything worked fine, 
but 
> it was still kinda "juicy" with jelly.
> > Hence I lost the functions of the heater, defrosted & vent, 
AFTER 
> I reassembled the whole console area.
> > So next year when it warms up I will buy one of Grady's new 
> hardcore diaphrams, rebuild it correctly, and be done with that 
> issue.
> > Hopefully that will have pointed you in the possible right 
> direction to diagnose your issue.
> > 
> > But hey at least you have AC to keep you warm, it has to be 
warmer 
> > than it is outside right now :)
> > 
> > Best of luck,
> > 
> > Joe OBrien
> 
> -------------------------------------------------------------------
-
> 
> --- In DMCForum@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote:
> > 
> > Hi Derek, 
> > 
> > I didn't see your original post. You're my closest sister VIN so 
I 
> > would have responded if I had seen it.
> > 
> > When you switch to vent, heat or def does the fan motor keep 
> working or does it shut down? On heat or def you're not supposed 
to 
> get anything out of the console vent and only a whisper out of the 
> > doors. Check to see if air comes out at the floor in the heat 
> > position.
> > 
> > Also, with regard to the lack of temperature change, your heater 
> > core could be clogged or the heater valve in the engine 
> compartment could be stuck shut. Also, make sure the cable from 
the 
> temp knob is attached. Do you have resistance when you operate it?
> > 
> > Rich
> > #5335
> 
> -------------------------------------------------------------------
> 
> --- In DMCForum@xxxxxxxxxxxxxxx, "Elvis Nocita" <elvisnocita@xxxx> 
> wrote:
> > 
> > Derek - even when you had yor car only a day you should be able 
to 
> tell us if the fan works or not - when the mode switch is set to 
> heating.
> > 
> > Don't make it more complicated as it is.
> > 
> > If the fan doesn't run - I bet the electrical contacts inside 
the 
> > switch may have a problem.
> > 
> > Also - within 4 months you should already have the manual and a 
> > schematic of the car and with that you could see, that the mode 
> switch position 90 is fed by fuse 18. Then the mode switch feeds 
the 
> fan speed switch. So if the fan works on A/C, then the problem 
must 
> be inside the mode switch.
> > Simple, isn't it ?
> > 
> > I visited NASA last week, maybe I am on a high-tech trip now ? 
LOL
> > 
> > Elvis & 6548 sleeping
> >

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