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post #1 of 5 Old 07-11-2013, 10:15 AM Thread Starter
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a/c Problems

I hear a hiss coming from the dash when switching between settings and when the truck is turned off. How do I fix this and what is it? Also, on long drives when using the a/c it sometimes is like the blower kicks off and air gets warm. The air doesn't blow as much, just feels like what is being pushed in from going 70. And lately I have been noticing when I run max ac and with hi on the fan the volt meter drops quite a bit? any insight into these problems?

-Brandon-
1996 F 350 7.3L CCLB
6637 Intake; Banks: Intercooler, Up Pipes, Turbo; PHP Phoenix
4" down-pipe, cat delete,muffler delete, 4" turbo back exhaust
Sky Jacker Suspension, Limo Tint, Cobra Classic 29 LTD,
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post #2 of 5 Old 07-11-2013, 02:26 PM
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Sounds like you prob have a vacuum leak controlling the air door. If you lose air flow and it gets air gets warm it sounds like the evap froze up. If you shut air off for awhile and then turn back in does it cool again for awhile? Side note my trucks hiss when changing vent settings that is normal but shouldn't be changing unless you turn knob


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94 F-250 reg cab 4x4 5spd 7.3 stroke. 3inch downpipe, 4 in exhaust. super duty turbo with 1.0 non wastegated exhaust housing ww2 and 360 thrust kit. Intercooler, MB diesel hpop, driven diesel complete efuel, 6637 air filter, kingpin dana 60.

09 F150 Lariat crew cab 5.4L v8


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post #3 of 5 Old 07-11-2013, 04:56 PM Thread Starter
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alright, i just dig around the vacuum lines and find that, yes if i shut it off a while it will be cold again, can i prevent this, is it a problem or just something that happens, ya mine hisses all the time

-Brandon-
1996 F 350 7.3L CCLB
6637 Intake; Banks: Intercooler, Up Pipes, Turbo; PHP Phoenix
4" down-pipe, cat delete,muffler delete, 4" turbo back exhaust
Sky Jacker Suspension, Limo Tint, Cobra Classic 29 LTD,
Stage 2 TC, improved internals
Loudest, Proudest member of the Fightin' Texas Aggie Class of 2015!
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post #4 of 5 Old 07-11-2013, 05:20 PM
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There has to be a reason it's freezing up. I'm not real familiar with these systems but work on ag machinery ac all the time. Reasons it could be freezing up drip hose is plugged not draining water out of evaporator housing orifice tube is having an issue lack of airflow over evaporator itself. Some systems have evap core temp sensors or a capillary tube hooked to temp control knob that senses evap temp and cycles compressor to keep it as cold as possible but not froze


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94 F-250 reg cab 4x4 5spd 7.3 stroke. 3inch downpipe, 4 in exhaust. super duty turbo with 1.0 non wastegated exhaust housing ww2 and 360 thrust kit. Intercooler, MB diesel hpop, driven diesel complete efuel, 6637 air filter, kingpin dana 60.

09 F150 Lariat crew cab 5.4L v8


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post #5 of 5 Old 07-11-2013, 05:31 PM Thread Starter
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ya i dont know much of anything on ac stuff, i'll take a look around on it,

-Brandon-
1996 F 350 7.3L CCLB
6637 Intake; Banks: Intercooler, Up Pipes, Turbo; PHP Phoenix
4" down-pipe, cat delete,muffler delete, 4" turbo back exhaust
Sky Jacker Suspension, Limo Tint, Cobra Classic 29 LTD,
Stage 2 TC, improved internals
Loudest, Proudest member of the Fightin' Texas Aggie Class of 2015!
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