Ford A/C :: Compressor Engages And Blower Switches To Dashboard Vents But No Cool Air
Jul 10, 2009
Looking to get the A/C working on my '78 F150 with integral (factory) A/C system. It is complete, but it seems to be blowing warm air as opposed to cold.
When I turn on the A/C, the compressor engages and the blower switches to the dashboard vents. I waited for a minute or two, but no cool air.
The sight glass has a silver line running through it. I assumed this was full? It would be black if it was low/empty.
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When the blower is on, it automatically switches from vents to defrost vents on its on. Does it about every 4 minutes.... like it's haunted. Curious if this is something i can tackle or do i need to take it in...
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I have a 2002 Ex with the 7.3. Every time I put it into 4x4, the A/C automatically switches to the windshield defrost vents. After a couple minutes it switches back the the A/C vents. I'm assuming that isn't normal.
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I've got a problem with my AC Compressor, with the AC on the compressor engages then disengages about every 5 seconds. Now I looked into it and some people said you can remove a washer to remove a gap. Do you think I should change the whole unit? Looked online and I can get one for $100. If I do work on the AC compressor to try and fix it or remove the whole unit do I need to drain any refrigerant etc etc. I have a hayness repair booklet and they said that to remove the ac compressor you need to get it drained by professionals. Although on the compressor I only see a electrical plug and no hoses.
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I have a 1999 F250SD with V10 and the compressor recycles about every 4 to 5 seconds and doesn't cool very much. I checked the 134a level and according to my gauge it has sufficient level. What could be my problem.
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I'm planning the install of a 1996 351w into my '77 F-100. I'm using the '96 accessory serpentine drive (FS-10 A/C compressor, '96 alternator, etc.). It needs to mate up to the '77 wiring. I'm going to use stock '96 underhood A/C components (accumulator, hoses, condenser).
As best as I can tell, the '96 system uses the ECU to manage the A/C system, but I've converted the '96 motor to a carb.
Looking at both the '77 and '96 systems I think the easiest underhood wiring solution would be to use the '77 compressor ON wire as a relay trigger, and use the '96 High Pressure Cut Off (HCPO) on the compressor manifold, and compressor cycling switch attached to the accumulator to interrupt the relay output to the compressor.
I can get the switches and pigtails, and I can look up their pressure trigger points, but I don't know the voltage the '96 switches operate at (12v or some reduced voltage?) or how to simulate their trigger conditions to see how they work. I guess that at ambient pressure the HPCO should be normally on and the cycling switch should be normally off. So I could just wire them into the relay ground or trigger connection. But of course they aren't simple two wire switches. (Edit: Looking at it online, the cycling switch appears to be two wire, the HCPO is 4 wire).
How to wire them, should I use them to interrupt the relay ground or trigger connection?
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As the season has started to warm, I noticed when I have my air temp set to 60 and only using the vent and have not selected AC I have hot air coming out of my vents. After doing some research it appears that I may have a bad Air blend actuator, bad air door or something else. I took my truck to the dealer to get my fuel filter changed and asked if they could diagnose the hot air issue. Not being a mechanic I told the service mechanic the problem and he says the AC compressor always kicks in on fords even if the AC is not selected and maybe I have a leak and he seemed to think it more than likely was not the air blend actuator or blend door.
I told him I had no idea that the AC compressor always kicks in even with it not selected. I knew it kicked in for AC and for defrots but didn't think it did for anything else. He said since the 90's all fords did. Well I get a call that after diagnosing the system, they believe the freon is low. I just have my doubts and wonder now if I should've just tried to take the air door actuator off and test along with sticking something in the air blend door whole and verifying it was moving.
I was hoping someone that knows more than me can verify if the AC compressor kicks in even when it is not selected when I have the temp selector set to low 60 degrees. Does it make sense that I would have hot air blowing out of the vents with the temp set on low even when it is cool outside. All of my temp controls work moving from defrost, vent to heat as I can feel blowing out of the different zones.
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In my 08 Expedition I notice the a/c compressor cycles on for 18-25 sec. then off for about the same. This is with an ambient temp of about 75f. A/C seems to be blowing cool air-never was really cold since new. The idle drops/surges a bit when the a/c kicks on also-which is what grabbed my attention. Is this a normal or is it short cycling?
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My 1999 F 250 5.4 liter. I know I have a vacuum leak because whenever I accelerate the air conditioning coming from the vents switches to the defroster. So my question is how do I go about finding the leak? My hubs in the front are manual so I know I don't have lines going up there. I do have some mechanical capabilities I've changed water pumps alternators brakes etc. But never anything with vacuum lines or a/c.
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2006 f350 DRW King Ranch diesel with 94,000 miles on it. When I shift in to 4x4 the AC switches to defrost and then takes 2 min to return to the vents. I imagine this is a vacuum leak issue. Where to start hunting? I pulled the dash for another install and all lines were connected. I will say the vacuum pump stays on longer than normal when the ignition is first activated.
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The issue I'm having is the A/C. When I got the truck the A/C was completely freezing. Recently however, the compressor was having issues not engaging and I fixed that by simply plugging the cord to the accumulator thing. . Now the compressor engages, but is not cooling really at all. It is an old truck and the compressor is a little worn from what I see maybe 2mm space when not engaged. I checked the levels of freon/coolant with a gauge and the amount is perfectly fine. Plus there seems to be no leaks.
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Weird A/C issue that started yesterday. Had ac on all morning, start my car after lunch, a/c runs for a few seconds, hear a squeak (like a belt sticking) no more a/c. Moving the temp knob makes no change just all hot air. Both fans engage, compressor and what I believe is the clutch engage, hoses get cold, and no CEL's. Really stumped here.
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Ok I am at my wits end with this. I have a 2000 Mustang GT 5-speed with 80k miles. When the A/C is on it will occasionally misfire at steady, low (between 1-2k) RPMs and will have a fluctuating idle as well. Occasionally the fluctuating idle is bad enough that it stalls out. It only does this when the compressor is engaged. It sounds like a vacuum leak, but I have checked and cannot find any sort of vacuum leak. Also, it throws a P0300 (Random/Multiple misfire) code. When the A/C is off it runs like a charm. Here is everything that I have done...
Replaced COPs
Replaced spark plugs
Cleaned MAF sensor
Cleaned IAC valve
Replaced fuel filter
Replaced fuel pump (unrelated to this, the old one just died)
Ran seafoam through the motor
New battery (again, unrelated)
and maybe some other stuff I am forgetting
Also, I have taken some readings:
Fuel pressure @ idle ~32psi
Vacuum @ idle ~17in Hg
Had alternator tested - OK
Pressure in A/C system checked out OK (though I did use one of those AZ cans with a gauge on it, not sure how reliable that is)
Also, the A/C works great. It's like an arctic wind in there.
I am at a total loss for what to do. I would suspect it's something with the motor that is simply exacerbated by the added load of the A/C but I suppose it could be the A/C compressor? Is it possible that it needs lube? Doesn't the freon lube the compressor? (The pressure indicates it's fully charged and the A/C blows cold AF) ...
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The A/C is not working in my 2002 S-10. Currently the compressor runs, but the air is not getting cool. I tried adding freon, but it has not worked. The low side pressure is about 50 psi, and would drop a few pounds when the compressor is started, but it drops no further. I have not noticed the compressor cycling while it is on. The can of refrigerant is not empty, but the system does not seem to be taking any more from that can.
Do I just need to add some more coolant from a fresh can, or is something else at work here. Also, probably unrelated, when down shifting it is fairly common for the air to switch from blowing up front to blowing on the defrost.
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I'm trying to bring fresh air at ambient temperature into the cab, but even on Econ and Lo, incoming air is a good 20 degrees F warmer than outside, even after 20 minutes or so giving the system time to cool off. The dealer says this is normal. Is there no way to get cool outside air in through the ventilation system without turning on the compressor?
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I wanted to know what do you use to clean the interior of your GX? For example the wood, the chrome parts, the display, the plastic around the door switches? I am using the Meguiars Gold Leather spray for the leather which is doing a decent job, but I don't know what's best for the dashboard and the other parts.
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I have a 97 expedition that i am having trouble with. It has front and back airconditioner. The compressor is short cycling real fast. Warm air in the front and cool air in the back. I put a can of freon in but still not cooling. The gauges are between 30 psi and 50 on the low side. The high side is between 100 and 150 psi. The ambient temp was 80 degrees.....
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A high pitched squeal appears to come from the front of the a/c compressor whenever the clutch engages. When the clutch disengages the compressor stops spinning, and the squeal stops. I can watch and listen to this as the system cycles with the a/c switched on. If I turn off the a/c, no squeal. I'm guessing the bearings in the compressor are going out. However, the system still cools normally, so apparently no gas has leaked out.
Does this imply the compressor must be replaced, or could injection of some oil into the system possibly fix it...?
This car only has 73,000 miles on it. I've owned 2 other TB's and a couple classic Mustangs with much higher miles and never seen an a/c compressor bearings fail.
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I have an '08 350 with less than 82K miles. My problem is the AC. The vents on the passenger side blow out cool air and all the vents on the driver's side blow out hot air. Even the vents in the backseat, the left one blows hot air and the right one blows cool (my son informed me of this as I hadn't even checked). As you can imagine it's very uncomfortable driving around in this CA heat every day, especially since the driver side vent in the center cannot be completely closed. What could cause this?
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Had a few warm days last week and noticed a lack of cooling from the HVAC system. Local temps cooled off a bit but I decided to see what I could find out before I got hot again.
Started playing with the system in the driveway and discovered good cooling capacity on the passenger side but just mildly cool air coming out of the drivers side vents. This seemed to be true on both the front and back. I hooked by laptop up and noticed single digit temps at the evaporator. When I brought the temps down on the climate control the right side exchanger would get down to around 12C but the Left would struggle to get to 22C and if I moved the passenger side requested temp up the drivers side exchanger temp would follow even though the requested temp on the drivers side was low. There was a display for the Left and Right regulating valves but they seemed parked at 0.0 unless I made a cabin temp change.
I am guessing the left regulating valve is the problem but know nothing of how this system works. 2004 Phaeton V8 ....
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When ever the car stops at a traffic light or stop sign, the air compressor cycles rapidly and the cool air turns warm. I was told the cooling fan was not coming on, but the other day the fan was cycling and the cool air stayed cool. My question is what controls the cooling fan operation? It seems the high pressure switch is working correctly and the fan motor is working. As long as I'm driving the air is cool.
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