97Ranger3.0
Active Member
- Joined
- Nov 22, 2017
- Messages
- 175
- Reaction score
- 67
- Points
- 28
- Location
- Florida
- Vehicle Year
- 1997
- Make / Model
- Ford
- Engine Type
- 3.0 V6
- Engine Size
- 3.0
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Total Lift
- 4"
- Tire Size
- 33x12.5
So, I believe I have a vacuum leak somewhere in the HVAC system on my 97 Ranger. I don't know much about how the vacuum controlled HVAC works, so I don't even know where to start looking. I've attached a video to help show what is going on. I don't always remember this switch making so much noise, maybe it does and I just never noticed before. But when I switch to different vent settings, you can hear what sounds like air leaking out. It sounds like it's coming right from that switch. Again, maybe it's supposed to make an audible noise but I don't recall it always doing that. I checked the connector at the bottom of the backside of that switch that has all of the vacuum lines, and I don't see any damage and it was connected properly. I did a quick visual inspection of all of those lines as far as I can see, and I didn't see any damage to them. But again, all that noise sounds like it's coming right from that switch.
Also, the most noticeable issue I have is that when I use the A/C, the truck drives like it has a big vacuum leak. It rev hangs and the revs drop super slow between shifts, and when I push the clutch in to come to a stop, the revs jump or stay up to 1500-2000 rpm then slowly drop down. If this happens and I quickly switch it to the vent only setting, the idle drops back down quick like normal. This only happens on any setting that cycles the A/C compressor. If I just use the upper or lower vent settings, I don't notice any drivability issues. However, you might notice in that video that the idle actually jumps up just a tad when I switch it over to the lower vent only setting, but again I don't notice any change in drivability when on vent only settings.
I'm just looking for some advice on where to look and what to check, maybe even a vacuum diagram for the HVAC if someone has one. I'm just trying to avoid tearing the entire dash apart unless I have to. Thanks!