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I just bought a 97 cobra and I believe the heat works. The blower sounds but for some reason I don't feel but of anything coming out of the vents. Anyone know why the air wouldn't be coming out?
Heat I guess works but air doesn't come out?
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I am assuming this is a vacuum line but I haven't even had a chance to really look under the hood. Just got it to the house yesterday.
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Is the air coming out of the defroster? If so the problem may be a disconnected vacuum line. The vent damper motors are vacuum controlled. There's a small vacuum line from the motor through the firewall. If disconnected or leaking would cause the vent dampers to assume their "default" position which is the defrost mode.
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Yup, the hvac panel control is dependent on engine vacuum. There is also a diaphragm switch or two behind the dash somewhere that are actuated by the vacuum depending on switch position, which is what are actually responsible for making the mechanical switch from one vent position to the next.
In my little experience with hvac vacuum related stuff, usually in absence of vacuum to control vent selection it will blow out the defrost vents as sort of a default. I have also experienced it where it will switch from whatever vent is selected and begin blowing out of defrost when throttle is applied (which causes manifold vacuum to decrease) - I have a '96 Explorer currently that does that.
In my little experience with hvac vacuum related stuff, usually in absence of vacuum to control vent selection it will blow out the defrost vents as sort of a default. I have also experienced it where it will switch from whatever vent is selected and begin blowing out of defrost when throttle is applied (which causes manifold vacuum to decrease) - I have a '96 Explorer currently that does that.
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Yes it comes out the defroster. Yeah no I think I have a new problem. Either it cracked and slipped inside the firewall or someone decided to rip it out. AC compressor is still in the car so I don't see why that would be done. Does anyone know where I can get replacement lines?
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OK I just found some one saying it has a vacuum tree on the firewall. I don't see one. Also PCV has only 1 line going out. The top part has a cap to seal the vacuum. I have no idea why someone would do this. Any way I can't seem to find any of the parts online.
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If I have to buy Lines Anyone know what the size of hose is?
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^^^tiny^^^ About as thin as they come.
Suggestion. Look at a buddies Mustang or go to a Salvage yard. Look for the thin/tiny vacuum line going through the firewall near the AC lines. That is the line in question. When you see it, you will know it.
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