Location: North East Ohio
Posts: 123
My VIN: 5780
I am having an interesting problem with the AC system on my car. No matter what the condition, when I turn on the Max AC, it always works and is ice cold. But when I turn it to the normal AC, it's hit or miss on whether or not anything comes out of the vents. It's like the fans just stop blowing on normal AC. The fans will blow on vent, heat, defrost, and max AC. My first thought is maybe a relay that's on the fritz. Is this a good place to start? Where else could the problem be?
Thanks.
Location: Leonardtown, MD
Posts: 9,008
My VIN: 03572
Do you mean the amount of air coming out of the vents changes from Max to Norm? Does it do it with a door or window open? If not then your car is sealed up to tight.
That would have to be a problem with the mode switch.
There are no electrical differences switching from Max to Norm.
Location: North East Ohio
Posts: 123
My VIN: 5780
Yes, on Max the air flows normally, but on normal, sometimes no air comes out regardless of the fan speed. Sometimes it'll work just fine on normal, and on max the fans sound like they're going a little harder, but mostly on normal ac, nothing comes out of the vents.
Location: Baton Rouge, Louisiana
Posts: 3,047
My VIN: 16510 and carbureted
Club(s): (GCD) (SEDOC) (DCUK)
Has your AC switch ever been rebuilt? Does it make any hissing noises? You could be experiencing a leak in the switch. I would get on the phone with your vendor of choice to see about having it rebuilt. I think Hervey rebuilt mine for about $35.Originally Posted by orbitron3000
Location: North East Ohio
Posts: 123
My VIN: 5780
There is a hissing noise when I go from either of the AC's to the vent. I'm not sure if it's even been rebuilt. Would it be a difficult procedure to rebuild the switch on my own?
Location: Eglin AFB, FL
Posts: 1,603
My VIN: 3299
I have had this problem the entire time I've owned my car. Let me guess - you don't have "Heater" too ? I have wondered for so long what this is. I have the mode switch diaphragm here ready to rebuild. Hope the Ohio DeLorean Club is ready.
And yep - mine hisses too.
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Actual snippet of a conversation from Sept 2013:
Me: Eddie, I can't wait to get the car back when you're done with it.
Eddie: Yeah, you'll be able to give the car gas, and it won't be - like - embarrassing....
Location: Baton Rouge, Louisiana
Posts: 3,047
My VIN: 16510 and carbureted
Club(s): (GCD) (SEDOC) (DCUK)
The switch isn't supposed to hiss. Rebuild the thing and the problems should go away, unless there is something else that is broke.
Basically there is a rubber diaphram that needs to be replaced. It is pretty simple to do but I decided to let Hervey rebuild it. I'm not sure what DMCH sells the part for but they do have detailed instructions on their support site if you choose to use their part.
www.delorean.com/pdf/modeswitch-rebuild.pdf
Location: North East Ohio
Posts: 123
My VIN: 5780
So the assembly appears to be intact. I can manually move the arm to open and close the vacuum vents. For some reason it always defaults to closed and wont stay open. What could be wrong?
Ryan
#5780
Location: North East Ohio
Posts: 123
My VIN: 5780
Upon digging a little deeper behind the console, I've found what I am hoping is the culprit. It looks like a vacuum hose may have come unplugged. However I don't know where it plugs into.
Ryan
#5780
Location: North East Ohio
Posts: 123
My VIN: 5780
I think I need to wait like 5 minutes more before posting because I seem to keep answering my own questions if I look hard enough. I managed to find where this mystery tube came from. Once I plugged it in, the arm opened and closed the vents as I switched modes. Now it only seems to open the face level vents on Max AC so I'm hoping that I just need to switch some wires on the mode selector and it'll all be fixed.
Ryan
#5780
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Dave M vin 03572
