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Re: AC Vacuum Leak
The temp blend door is operated by a vacuum motor.At higher engine rpms the manifold vacuum decreases.Most manufactures incorporate a vacuum storage tank to compensate for this lose of vacuum.So it does sound like you have a vacuum leak to the ac control unit.There should be a vacuum line going through the firewall into the cab.Inspect this line for leaks.Good Luck!!!!
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I'm no expert when it comes to your vehicle. However it sounds to me as though there may be a vacuum leak somewhere causing the HVAC door that controls the AC/heat to be faulting to the 'hot' side.
Drive the car up to 55 MPH with the AC on. Making sure there is no vehicles close behind you,completely let off the gas pedal and see if it starts blowing cold air right after letting off the throttle. If it blows cold, then it's probably a vacuum leak.
If it doesn't blow cold then it could simply be low on freon or a partially clogged filter in the AC line.
2 things come to mind the first is are you stepping on the gas to accelerate when it happens this will be caused by a vacuum leak somewhere in the emissions or under the dash/ second are you standing still and you feel the air get hot if this is the case your cooling system is running hot and the heat is transferring to your a/c condenser and making it hot reducing the cooling effect of the Freon because it is getting hot itself
the door for the air flow is controled by vacuum operated motor. there is a leak in that vacuum circuit. when accelerating, engine vacuum drops until the rpm levels off. when there is no vacuum to the motor, the default postion directs air flow to the defrost vents to make sure you're able to clear the windshield.
Hello. This is happening because your vacuum reservoir is not working. The vacuum reservoir maintains vacuum to your AC controls as your engine vacuum drops during acceleration. Check all your vacuum lines and the reservoir for cracks and you will have this situation solved. The reservoir was a metal can (like a tomato juice can) at one time but if my memory serves me in 1986 they went to a plastic version.
Sounds like the head unit is going bad, or there is a vacuum leak. If you recently had any work done under the hood look around for a disconnected vacuum line, usually a piece of small hard plastic tubing leading to a rubber hose connector.
sounds like the system is either low or out of refrigerant. There is a low pressure switch in the system to shut it down in the event of freon loss. First , verify , then test for a freon leak. Once repaired, and recharged, will blow cold air again.
You have a vacuum leak. The default postion(no vacuum) is defrost and heat. Check the small black vacuum line coming out of the firewall on the right side near the ac evap and heater core. Trace it back to intake and make sure it has vacuum there and there are no leaks. You should also see a vauum canister when u trace it back,this is the reserve so u have enough vacuum to keep it from changing from floor to def when accelerating.
I experienced almost the exact same thing in a customer's 1997 Dodge Caravan this week except on this one,the A/C would be blowing cold out of the vents,directly at you,and when you put the accellerator down pretty hard,the vents would cease to blow,but you could hear the defroster door flap,and the defrosters blew cold air.Let off the gas pedal,it switches back the way it originally was.Wasn't the customer's complaint,but it did make me wonder.