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

["lakelanier20" <derek4567@xxxxxxxxxxx>]

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

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--- 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

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--- 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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