Weird! Blower motor/fan blowing but not blowing

[86gtriceeater]

My heater fan works on all positions and sounds like its blowing but no matter what position i put the controls on it doesnt actually blow any air. Well a very very little bit through the dash pad for the defroster. Its warm but doesnt blow but the fan turns on.....whats wrong?

 

[ID89GT]

Is the defrost blowing air?

 

[86gtriceeater]

yeah but just barely...

 

[HISSIN50]

Unless you have it set to blow through the defroster vents, you have a vac leak in the HVAC vac line. I'd find and fix it and then see what else is going on.

 

[86gtriceeater]

where do the vacuum lines go for HVAC? Im not sure what you mean

 

[HISSIN50]

There's one feed line and it always cracks or leaks and it leads to only having the defrost vents functional (they're the default when there's no vacuum signal).

Do you have a fox III or SN95? Both have the issue but the source is usually a different location (SN's are in the engine bay and foxes are inside).

 

[Repostyle]

The HVAC (Heating Ventalating Air Conditioning) vac lines connect to the back of the controls in a fox, just follow and inspect.

 

[86gtriceeater]

Is there supposed to be a hard line coming from the radiator area into the firewall for the heater or just A/C?

 

[87GT Drop Top]

Maybe the blower wheel is broken.

 

[86gtriceeater]

blower wheel?

 

[HISSIN50]

The blower motor spins a large hamster wheel - that wheel is what moves air. It's normally made out of thin plastic.

 

[86gtriceeater]

I have no idea how to check that. i tried but wouldnt i have to take the dash apart? Its getting cold and i dont have a garage....

 

[HISSIN50]

I would think you'd hear funny noise if the fan blade was broken (noise is a symptom in my experience).

It's more probable that the vac system has an issue and all your air is being diverted through the defroster or other vents.

 

[liljoe07]

Posted via Mobile Device

Look on the firewall. By the passenger hood hinge. There is a check valve mounted there. This is part of the main source of vacuum for the A/C system. Like HISSIN stated, if this is broken or damged, you end up with Defrost only.

 

[86gtriceeater]

Yeah looks like it isnt there anymore after my engine swap what the crap! Does anyone have a picture so i know what part it is and install it quick before i freeze my a** off anymore?

 

[HISSIN50]

Just trace the vac line from the vac tree.

 

[86gtriceeater]

Oh man i would but i redid my vacuum lines. I guess i assumed that was emissions related equipment and took it off. Please help!

 

[Saleen0679]

See:
http://www.stangnet.com/mustang-forums/767567-c-check-valve-broke.html

You might also find this useful.

 

[86gtriceeater]

okay what is the vacuum reservoir and hold assembly? that square thing? Is that necessary or do i just need the valve with vacuum to it?

 

[Saleen0679]

The vacuum reservoir is the black ball inside the passenger fender. It stores vacuum to operate the vacuum operated assemblies like the HVAC vent controls.