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

["content22207" <brobertson@xxxxxxxxxxxx>]

Has it occurred to anyone to ensure electrical connections on the mode
switch itself are intact and in correct order?

Clockwise, looking at the switch from the rear:
- Green/White and Green/White (12v in and out)
- Pink/Orange and Red (to A/C compressor and noise capacitor)
- Green (to fan switch)

Look at the diagram on Page N:08:15 -- sounds to me like his
Pink/Orange and Green are backwards...

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote:
> 
> All true, but the fan shuts down on vent, heat and defrost. That's 
> an electrical failure that needs to be addressed.
> 
> Rich
> 
> --- In DMCForum@xxxxxxxxxxxxxxx, "Joe OBrien" <joeyoseppijoe@xxxx> 
> wrote:
> > 
> > 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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