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Discussion Starter · #1 ·
Alright, I've belonged to TDS for a while now and asked a question about AC problems there a year ago (tried recently too, got some views but no help), got a couple of responses but nothing worked out, and I hate begging for help. However, it now seems most knowledgible people have left there for better pastures. So, I will post the same question here, and I hope you guys can point me in the right direction. Mine, like many others my AC only blows out the defrost vents. However this is where it gets unique. I replaced the vacuum pump and it runs continuously, suggesting a vacuum leak. I installed a dynatrac free spin kit and plugged the vacuum line comming out of the Pulse Vacuum Hublock Solenoid (PVH or PVHS as some refer to it as) right above the vacuum resevoir. Now the line going into the cab has a connection right before the firewall. I disconnected the connection there and felt vacuum at the connection. The line in the passenger footwell is still connected too as some people suggested that it comes undone. Now someone suggested that I disconnect the power from the PVHS and that did nothing. When I was troubleshooting I heard a clicking as I rotated the climate control knob, every setting I turned to I heard a click, like something was trying to change. The clicking sounded like it was comming from under the hood. However, I am working by myself and can't find the clicking. If the consensus is that I still have a vacuum leak, A) where should I look, and B) where can I get vacuum lines or parts. Thanks, hopefully with these clarifications someone can offer some help.

Thanks in advance, like the new environment here.
Jeremy
 

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Does every other switch position work? Can you get hot/cool out of the dash or floor if the switch is those positions? The clicking sound is actually to the left of the glove box. There is a damper there that diverts the air flow and it is operated by vacume. Sorry for all of the questions, just trying to get all of the information.

Scott
 

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I did one on a 97f250 awhile back and there was a ink pin holding the defrost door open LOL.

It happens when people use the dash as a storage bin then over time from turning corners and stomping on the brakes, junk goes DOWN the vent.

It can and will happen to a superduty too.


Check there.

ALSO,you COULD buy a vacuum test pump....the one you pull down a system with to check for leaks. There like $30
 

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Discussion Starter · #4 ·
No switch positions work, just defrost on every setting. Could the damper be bad? For a vacuum test pump, would a brake bleeder vacuum pump work? If so how do I go about testing it, just break a connection and see if I hear a hissing? If something fell down a dash vent, would I have to open the vent from under the dash to check? Thanks for the help guys, theres a cold one here if you are ever in the area.

Jeremy
 

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Break a connection and pull a vacume on it. If there is a leak, you will not be able to maintain a vacume. I you take the glove box off, you should be able to get back to the damper and take a look. You may want to see if the damper is blocked by something as well.
 

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No switch positions work, just defrost on every setting. Could the damper be bad? For a vacuum test pump, would a brake bleeder vacuum pump work? If so how do I go about testing it, just break a connection and see if I hear a hissing? If something fell down a dash vent, would I have to open the vent from under the dash to check? Thanks for the help guys, theres a cold one here if you are ever in the area.

Jeremy
Even if no switch positions work, there still cold be something obstructing the door holding in the defrost postion.
 

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jerome, inspect the reservoir under the hood for leaks as well, and all the lines.

Mine had what appeared to be battery acid on it and ate a hole in it. I rerouted some lines eliminating that canister and it works like a charm.
I haven't gotten around to replacing the canister, but everything works.

Take your time and eliminate one thing at a time, you'll find it.
 

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Defrost is the default postion. So you are not getting any vacume to the damper (or something is jammed in there) I would try to eliminate one portion of the system at a time (A/C, hub line plugs...)
 

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Discussion Starter · #10 ·
Thanks guys, I've got duty tomorrow and then I have to finish riveting in a new floor pannel on my girlfriends car on saturday, hopefully will get around to it sunday, its been way to damn hot down here to have AC not working like it should, when I figure it out I will post results and pics if I can. Thanks for the help, the offer above still applies to y'all.

Jeremy
 
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