Ford A/C :: Hot Air Blowing From Rear Unit
Jun 1, 2003
On my '98 Windstar the rear A/C is blowing hot air. Additionally the air is coming out of the incorrect vents, the ones that the heat normally comes out of. It appears that the valve under the rear A/C unit is vacuum actuated, and I would assume that the louvers to control the air flow are also vacuum actuated. If this is correct, I would assume that I have a vacuum problem? However if it was a vacuum leak wouldn't the performance of the vehicle also show this?
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2001 Ford Windstar rear auxiliary unit will not blow hot or cold air. The front system works fine with very cold or very hot air as needed.The system has been in this state for the past four years.Last month I had a local shop evacuate the refrigerant and then I replaced the following A/C components (compressor, front orifice tube, rear expansion valve, receiver dryer, and condenser). The shop then recharged the system and the front blows ice cold air...amazing! Unfortunately the rear system just doesn't want to blow any air, hot or cold. To date I have completed the following checks:
Relays
- Front cabin relays #3 and #6 were swapped with no change to front system.
- Rear unit relays make a clicking sound when either front or rear control panels set blower motor speed.
-- I swapped out with front and rear cabin blower motor relays with no change to front blower motor.
Engine Compartment - Both 40A fuses were checked (117 & 120).They are supposed to be 40A fuses but my box had 50A in both places.It had been like this for years with both systems working fine up until the rear unit ceased working.(NOTE: maybe this is coincidence but when I changed these from 50A to 40A my son noticed that some of the rear tail lights stopped working. in fact all of them associated with fuse #7 located in the passenger cabin.)
Fuses - all related fuses were checked and are fine.As noted above the distribution box fuses were changed from 50A to 40A with no detrimental effect on the front system working.
Front Control Panel
- Heat and air work fine (blower and temp controls)
- Front control panel appears to change rear unit temperature setting but only one of blend door actuators adjust when changing temperature setting
-- The one closest to the blower motor does not function.The one that directs air to floor or ceiling functions properly.
-- Shouldn't they move together based on the temp setting?
- Front control panel blower motor settings only result in hearing a clicking noise for each setting.
- Setting front control panel to REAR CTRL allows rear control panel to function.
Rear Control Panel
- Temperature settings - same result as front control panel with blend door actuators.
- Blower motor settings - same result as front control panel.
Rear Auxiliary Unit
- Expansion valve makes a hissing sound on A/C or Defrost settings.
- Blower motor was removed and benched tested for operation.
-- Electrical connection looks fine and seats snug.
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Looking for the easiest route to get my video cable from a rear (aftermarket) flip down monitor back up to the head unit. The monitor flips down pretty much in line with the back rest of the 2nd row (for reference purposes). I am thinking to the side down the pillar and under the carpet might be the easiest.
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I just purchased a new to me 05.
PO, had a pioneer H/U installed, however the 4 rear speakers have no sound.
The rear of the radio seems to have everything plugged into it correctly.
My steering wheel controls work fine.
I'm guessing the rear volume/controller is canceling out the rear speakers???
If so what can I do to make the speakers play? I don't need the rear control to work.
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Just having a little stereo work being done and noticed a wet floor under the insulation after removing the rear side panel covering the a/c unit. Is that normal? I read some folks have had to seal the fan box...is that most likely the issue?
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2002 F250 diesel ... I found these two plastic pieces yesterday on the floor near the 4X4 shifter. I noticed the other day when i step on the brake the rear view camera in the head unit comes on, so i am thinking they are either a part of the brake switch on the pedal assembly, or something to do with the shift tube.
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1998 Windstar Limited. I have no vacuum to my rear Auxiliary Unit. I am considering buying a hand vacuum pump. However, I never used one. Is there a video available.
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Top and bottom left. Where the 2 vac lines on the rear diff/haldex unit goes?
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My 2001 E350 van's factory rear A/C is not working. Front A/C and heat is fine. Regardless of front control position for rear, heater stays on all the time unless I turn it off with the rear control. No air is blowing from the rear A/C vents, only from the rear heater vent. This isn't a big problem right now, but will soon be an issue. I use this van for my sales route, carrying a lot of temperature sensitive snack products. I don't have an owners manual, and the Haynes manual has no info at all regarding the rear A/C.
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The front a/c blows cold air but the 2nd row and back blows warm. Yes the temp dial is on cold on both dials. Is there a separate a/c clutch that I dont know about to ck the air gap? Is there a separate port to put freon in besides the front. I need to get this fixed because with my bulldogs in the back the heat will kill them.
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Ok, I have a 98 F150 XLT, standard cab, 8 ft. bed, 2WD with limited slip - if any of that makes a difference.
The rear axle vent tube is literally blowing oil out the top, where it's loosely connected to the bed. It does this every few weeks. I pulled the hose and ran a rifle cleaning rod down it to make sure it wasn't plugged ... it wasn't.
It seems like it's building up pressure somewhere, then blowing all at once, but why?
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My 97 e350 club wagon is doing something weird. Front AC wont go to Max Air, the blend door wont function. Can hear vacuum trying to work. Rear Unit is on Heat even though Front is on AC and blows hot air out the rear floor vents. Hit some high water going too fast about a year ago. Next day, this started happening. Rigged up blend door so air flows through vents.
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Had a question about the rear a/c cooling on my 2009 GX 470 - the last few days have been nice enough to warrant using the A/C. I noticed though, that the 4 rear vents seem to not be producing any cool air - kind of a problem when I have an overheated Boxer dog that would love some cool A/C. Any thoughts? I have the rear A/C on, all the way to the - or minus sign and the fan speed to Auto.
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I purchased a 2009 Honda Odyssey and now the rear A/C is not working. I have tried all setting from the front controls as well as the rear controls to no avail. Nothing comes out. Zero. Nada. I am not sure where to begin to check for the problem. I read a forum that indicated to check F56, but the fuse numbers don't go up that high.
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So a recent problem on my 2012 sf.. the front vents blow hot and the rear blows cold.?
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It's a '00 zr2, usually after 15-20mins driving I see smoke blowing out rear at highway speed. If I'm driving slow same results with smoke just rolls out from hood. Smells like trans fluid although doesn't seem like the level is any lower yet.... Guessing gasket when under pressure, I would guess passenger side hitting manifold but I haven't seen obvious leaks don't know where to start.
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So last couple days over the 4th, the heat was over 95.
AC Blowing out of the vent is cold but the rear seats passenger feels warm.
Even with the blower on the higher and temp on the lowest 65 (or lowest setting).
I put my hand towards the rear seat and I feel warm air. Near the vents are cool but its like the AC can't keep up with the heat ?
2010 @ 51k ... 450h ...
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This issue came on suddenly. I unplugged the license plate lights- fuse still blew. I don't know where the wire harness is for this group of wires going to these lights to check for frayed or melted wires. I don't see any damage any where. I am severely limited for funds for a mechanic so I need to try and figure this out first myself. Looking for pictures of how I can traces the wires through the car?
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Ok well it has done it to me too many times. Of course this only happens when it is hot outside but it seems that when I drive for a little bit then shut off the truck for only a few minutes the complete AC dash display doesn't even light up at all. After a few hours or a few starts it kicks on like nothing has happened. It has zero power to the unit.
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The oil pressure gauge is dancing on my 4.2L '99 Ford E-150 (V-6) and at times the oil light comes on but there's no rattling or other signs of oil deficiency in the engine. I'm pretty sure it's a problem with the sending unit and did an oil change today but for the life of me couldn't find where it's located. I looked all around the filter when I replaced it but to no avail. The Haynes manual and internet pics I find are not recognizable parts in them to reference. I can't tell if they're looking under the car, on top, driver's side etc.
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No power to the radio or cd unit. When I push the power button nothing comes on. Also my clock is flashing and I can't set it. What is the problem?
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