problem #3 in my 1998 ranger
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Joined: Apr 2007
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Originally Posted by Rockledge
If you pull off the passenger tire and splash guard, you will find the vacuum reservoir tank and from that you can follow all the vacuum lines to check for leaks. If you have the PVH 4x4 system, there will be an additional line between the reservoir and the PVH solenoid, and then from the solenoid to the wheel ends. The reservoir has a built-in check valve that I have heard can fail. I've also heard of the PVH solenoid failing and allowing vacuum to bleed off.
Here's another thread with information on the climate control air flow system:
https://www.ford-trucks.com/forums/s....php?p=2020808
Here's another thread with information on the climate control air flow system:
https://www.ford-trucks.com/forums/s....php?p=2020808
Q2: what is the fix for the two types of failure you quote? I am now banking on these as this is what i experienced today (note i checked the blend door and it's functional, followed vacuum lines wherever i could and no blatant leaks were found) I can even "activate" the vents by manually pushing on the vacuum motor that operates them and that works for a little while, then it defaults back to 'defrost' only mode.
Anyway; here's what makes me believe the vacuum reservoir might be the culprit: I was running the vents as usual (with defrost air function only) then i proceeded to enagage 4-LOW and voila! the vents started working - full stream!-. Stayed that way until i picked up speed/engine load {vacuum} as I got on the on-ramp onto the expressway; then the vents 'shut-off' and went back to defrost mode again.
This is 100% repeatable by the way... what do you suggest ? (where is the check valve in the reservoir? is it a good idea to get a reservoir from the U-pull-it JY???
Thanks in advance.
Last edited by Guapo XLT; Apr 9, 2007 at 07:45 PM.
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
1. PVH = Pulse Vacuum Hublocks
2. I'm not sure what you mean by "two types of failure I quoted"...?
3. I would be thinking the same thing based on what you've described. Sounds like you have a large vacuum leak or a bad check valve/reservoir. Time to pull the passenger tire and splash guard to take a look. The check valve is inside of and integral to the reservoir.
If you find the check valve to be bad, you might try installing one in the hose that feeds vacuum to the reservoir. You can find them on the rack at most parts stores.
2. I'm not sure what you mean by "two types of failure I quoted"...?
3. I would be thinking the same thing based on what you've described. Sounds like you have a large vacuum leak or a bad check valve/reservoir. Time to pull the passenger tire and splash guard to take a look. The check valve is inside of and integral to the reservoir.
If you find the check valve to be bad, you might try installing one in the hose that feeds vacuum to the reservoir. You can find them on the rack at most parts stores.
New User
Joined: Apr 2007
Posts: 14
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Originally Posted by Rockledge
1. PVH = Pulse Vacuum Hublocks
2. I'm not sure what you mean by "two types of failure I quoted"...?
3. I would be thinking the same thing based on what you've described. Sounds like you have a large vacuum leak or a bad check valve/reservoir. Time to pull the passenger tire and splash guard to take a look. The check valve is inside of and integral to the reservoir.
If you find the check valve to be bad, you might try installing one in the hose that feeds vacuum to the reservoir. You can find them on the rack at most parts stores.
2. I'm not sure what you mean by "two types of failure I quoted"...?
3. I would be thinking the same thing based on what you've described. Sounds like you have a large vacuum leak or a bad check valve/reservoir. Time to pull the passenger tire and splash guard to take a look. The check valve is inside of and integral to the reservoir.
If you find the check valve to be bad, you might try installing one in the hose that feeds vacuum to the reservoir. You can find them on the rack at most parts stores.
( i said 2 types of failure as you mentioned the vacuum res check valve and the hub vacuum solenoid).. so; which line should i check for vacuum bleed off? (i don't know what the vacuum res. looks like - i actually followed the lines to it today as i installed new front shocks, but did not remove the wheel well plastic/inner fender; only the splash shield)..!
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Check all the hoses for cuts, pinches, loose connections, etc.
It's been a while since I've looked at mine so I wouldn't know how to explain which hose is which, except to say that the one that runs up to the intake manifold (driver's side of engine, toward the rear) is the vacuum supply line to the reservoir. I suppose you could start the engine and figure it out that way- the vacuum supply line from the intake manifold should have high vacuum at idle.
The vacuum reservoir looks more or less like a small ball with vacumm hoses coming off it. You can't miss it.
It's been a while since I've looked at mine so I wouldn't know how to explain which hose is which, except to say that the one that runs up to the intake manifold (driver's side of engine, toward the rear) is the vacuum supply line to the reservoir. I suppose you could start the engine and figure it out that way- the vacuum supply line from the intake manifold should have high vacuum at idle.
The vacuum reservoir looks more or less like a small ball with vacumm hoses coming off it. You can't miss it.
Last edited by Rockledge; Apr 9, 2007 at 09:03 PM.
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