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Old 11-21-2010, 01:06 PM
TheGuyFromNJ TheGuyFromNJ is offline
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Default Identifing 4x4 part and problem

I just bought the wife a 2000 Ranger 4x4 and don't know much about them. (I'm a Jeep guy)

the problem:
she is having a problem with the heater/AC vents. Narrowing it down to a vacuum issue I traced it back to some sort of actuator. I am guessing it engages the hubs on the front axle. It sits behind the right headlight, mounted in the most inconvenient place. It has a large electrical connector and 2 vacuum lines. What is it called?

Identifying: This unit is receiving plenty of vacuum, however I believe it is leaking it out. The vents won't work until you engage 4x4 then turn it off again, then the vents work fine until you change the air flow location. The vacuum connections to this unit are intact and not split or cracked.
Seems clear that this part is malfunctioning, is there a quick fix or just replace it?


Thanks in advance.
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Old 11-21-2010, 01:07 PM
Clinton Clinton is offline
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Default Re: Identifing 4x4 part and problem

Can you post pics of it?
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Old 11-21-2010, 02:36 PM
rwenzing rwenzing is offline
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Default Re: Identifing 4x4 part and problem

That part is the Pulse Vacuum Hublock Solenoid which directs vacuum to the PVH hubs to engage them in 4WD. In 1998~2000.5 Rangers, the PVH system shares vacuum with the HVAC controls and there is a reservoir to maintain vacuum to these two systems when manifold vacuum drops off. Common problems are a leaking reservoir or leaking PVH hubs. The location varies by year but I believe 2000 has the reservoir between the inner and outer fenders on the passenger side.
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Old 11-21-2010, 03:46 PM
TheGuyFromNJ TheGuyFromNJ is offline
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Default Re: Identifing 4x4 part and problem

Thanks for the reply.

Knowing the vents only works after I engage the hub lock, but continues to work when I disengage the hub lock until the hubs actually unlock. Would you say the PVHS is bad or the reservoir is not holding enough vacuum?

The 4x4 seems to be working fine.

Yes the reservoir is between the inner and outer fender, doesn't look like its easy to get to.

Last edited by TheGuyFromNJ; 11-22-2010 at 06:32 AM.
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Old 11-22-2010, 06:07 AM
TheGuyFromNJ TheGuyFromNJ is offline
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Default Re: Identifing 4x4 part and problem

anyone?
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