Vacumn cuts off A/C fans

[rtcraver]

So, I'm sure this happens to others...
Is there a way around the issue of the A/C fan/duct closing when accelerating? When I start out, the A/C blower stops until I let up on the Gas... Any comments on getting around this?

Thanks,

TC

[DMCMW Dave]

So, I'm sure this happens to others...
Is there a way around the issue of the A/C fan/duct closing when accelerating? When I start out, the A/C blower stops until I let up on the Gas... Any comments on getting around this?

Thanks,

TC

Bad check valve (or missing if someone took it out and forgot about it.

http://store.delorean.com/c-365-7-3-...-controls.aspx item #28 on this page. Should be right behind the ignition distributor, at least in that general area.

[TTait]

My check valve is fine, any other likely causes?

Tom

[Ron]

Vacuum leak.
Bad mode switch.
Vacuum line or port for air tank blocked.

[Bitsyncmaster]

Vacuum leak.
Bad mode switch.
Vacuum line or port for air tank blocked.

I just thought of a way to test the tank and the check valve. After shutting the engine off, see how many times you can switch from one mode to another and stop hearing the actuators and flaps work. One of us will have to test that to see how many times they work on a good car. Probably selecting something like floor heat and vent may work.

[Rich]

Interesting experiment, Dave. I'm volunteering. Results here:

Returned from a drive an hour ago. Restarted it just now, then ran your test immed. after shutdown beginning with mode switch at VENT.

Toggled the mode switch back and forth between VENT-HEAT positions. A toggle in either direction counts as 1 cycle for now.

Result: 7 such mode switch cycles with what sounded like full flap movement each cycle followed by 1 slower flap cycle with the sound of partial movement, then nada.

A/C condition: Mode switch rebuilt and silicone lubed ~10 years ago. Does not hiss. A/C works fine including under full accel.

I just thought of a way to test the tank and the check valve. After shutting the engine off, see how many times you can switch from one mode to another and stop hearing the actuators and flaps work. One of us will have to test that to see how many times they work on a good car. Probably selecting something like floor heat and vent may work.

[Ron]

I just thought of a way to test the tank and the check valve. After shutting the engine off, see how many times you can switch from one mode to another and stop hearing the actuators and flaps work. One of us will have to test that to see how many times they work on a good car. Probably selecting something like floor heat and vent may work.

Good idea!