Ford A/C :: Cold Air Stop Blowing On Occasion When Climbing A Grade Or Stopping At A Light In Warm Weather
Jul 7, 2005
Well, my saga continues on my intermittent AC problem on my 99 f350 v10. As before, the AC blows cold but mysteriously stops working on occasion when climbing a grade or stopping at a light in warm weather. I bought a gage kit and runs ~ 45/250psi on the low/high gauges. Clutch is stopping and the metal tube from the accumulator tank runs warm when this occurs.
Seems like the problem occurs when the under hood temp reaches a certain level. Thought it might have been one of the switches but the pressure seems to be OK when these problems are occurring. What/how to check to find the problem? some of my thoughts are:
1. Wire a light in the clutch engagement circuit to see if the problem is in the compressor clutch coil not working when powered up or some heat related failure of the wiring continuity.
2. Check the Hi and low pressure switches for continuity when this is happening. to do this I need to know a few things- location of the high pressure switch low press in on the accumulator) and whether the switch should be open or closed in normal operation. Also can the switches be replaced without losing the charge in the system?
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Alright, dodge grand caravan 3.8. Year: 05' ... Just broke 100k miles on this thing, last time i changed the plugs i noticed plug 2 had oil all down in it. I completely forgot about the problem cause i got side tracked with bad sway bar bushings. Anyways, what is the cause of the oil leakage? It has gotten so bad that I am blowing smoke when its cold, even is warm weather. There is also caked on oil and dirt on a lot of the parts down the front left side of the motor. Blown head gasket? Bad valve cover gasket? I want the best way to approach this . The smoke is white, but not enough smoke to be a completely blown head gasket.
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Every time I climb a grade, I get the 299 code. My VGTs go to 15 or 85. Does this indicate my turbo is sticking?
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Whenever the temperature is below 20 degrees F and am idling at a stop light, if I have the heater fan running I get a horrible exhaust smell inside my car. I have discovered that I can lessen the bad smell by turning off the fans when the car is idling and then turning it back on when I start to drive.
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I have a 94 toyota pick up automatic and my ac works great while I am driving. As soon as I come to a stop light and I am sitting and waiting for it to turn green. The air still blows from my ac but it isn't cold. My truck works great it has about 210,000 miles.
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I have a 2002 Civic LX. A/C worked until a few months ago. It would stay on for about ten minutes and then stopping blowing cold air; it would come back on and then go off again at it's own whim. Bought it to local Goodyear - told them the problem - they charged me about $130 to evacuate and recharge, looked for leafs but told me they saw no problems with the A/C, the condenser was fine, etc. A few days later, same problems started. Runs great for about ten minutes and then does its own thing.
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I have a 2007 Saturn Relay minivan. The front heater blows hot but starts blowing cold when you stop even for a red light but will blow hot again when you speed up and the rear heater never does blow hot, what could cause this? This vehicle has about 93,000 miles on it.
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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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Vehicle: 1995 960 wagon
Background: Exhibits intermittent no-start behavior in both warm and cold weather, wet and dry weather, having sat overnight, or only sitting a few minutes. Turns over fine, but won't start. Sunday, it started fine several times, went to Home Depot, wouldn't start. Called a friend to pick me up. When he was almost there, I tried it again and it started back fine. Been in shop a few times, they played around with a few electrical connections, battery cables and grounds to injectors. Also replaced fuel pump. I have not verified if it is a fuel or spark problem, I just bought a FI fuel pressure gauge last night.
Once started, it does fine. It never stalls or cuts out. That is why I am leaning toward a CPS (that's what jeep people call it.) Sometimes, under the slow cranking speed (relative to idle) the signal is too weak to be useful. However, during idle and normal operation, the flywheel is moving fast enough that the signal is much stronger (being a magnetic pickup). Thus, the reason it only happens during starting, not during running.
Here's my current working theory: Bad crank position sensor (is that Volvo people call it?)
This is the only part I can think of that would cause this. A fuel pump problem would probably show up during running. I think the pump also receives a signal from the cam sensor, so if that sensor were the problem, it would happen during running too, not just starting. It the cam sensor an optical sensor? Shouldn't cause it to not start, although it might cause a difficult start.
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I just bought a 2000 f250 diesel truck and am having problems with the ac. When I first turn on the ac it blows very cold and works perfectly but after about 5 or 10 minutes it will start blowing warm and slightly humid air for probably around 5 or 10 minutes and then suddenly the very cold air will come back. This cycle repeats over and over again and I'm not sure what is wrong.
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My 2003 windstar SEL needed new brakes and to have the rotors turned... instead I opted to buy new discs and pads online ... To my surprise the new discs were about a 16th of an inch thinner than the old.... I changed discs and pads and was happy for a few days, but now on occasion when coming to a stop the front brakes grind terribly....the next time i stop everything is fine...visa versa...dscs feel true (no pulsing) I DID APPLY BRAKE QUIET TO THE BACKS OF PADS....
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My Prius has 198K, runs great and has been trouble free. This week it started acting up. The AC will run for a few minutes, blowing very cold, then will blow warm air for a period of time, perhaps 10 minutes, then will blow cold again for a few minutes. It will repeat this several times, then will blow cold until the end of the trip, about another 30 minutes.
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This weekend was a nice high 80's low 90's. My AC is usually ice cold. However now that the weather hit that high, when we are in stop-and-go traffic, the AC starts blowing warm humid air. I do see the temperature need creep a bit higher than the normal range.
Once we start driving, after a few minutes, the climbs back down and the cold AC returns. Turning the fan speed down, or turning the compressor off, then on again, seems to work.
What could be causing this? A friend said he has this issue with his car claiming the engine is the issue, not being powerful enough to keep the compressor running right, is that possible?
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I have a 2001 Ford Taurus I bourg a month ago. The dealer I bought it from replaced the air compressor on June 29. Today I had been in my car for a couple of minutes and was stopped at a stop light when my car idle increased and all of a sudden I heard a high pitched screeching sound. The a/c immediately quit blowing cold air. I turned the a/c immediately to vent and continued to drive home. After raising the good once I got home, I could see a bunch of what looked like rubber and oil shavings down under the compressor. What may have happened?
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I bought this 06 Prius in April and it has been a nightmare. I have an 05 and thought "I love this car so much, I want another!". I didn't do a good job inspecting the car before I got it, but oh well. Here we are at the dealership because my Driver side AC was blowing warm and the passenger side was nice and cool. $300 later, they call me up and say they have drained all the Freon because theres an obstruction causing the pressure on the high side to get so high that the compressor purge valve has to kick in and their AC machine shut off to protect the car.
He said it would cost 1700 to replace the Expansion Valve and the Receiver Drier, and that they weren't positive that would fix the issue, but that its the first step before replacing the Compressor. He said normally they'd suspect the compressor is going out, but he said it appears to be operating okay. Their opinion was that there is an obstruction in the line - most likely some sort of metal - which is causing the obstruction and the pressure on the high side to go to extreme levels.
Pressure on the low side he said was okay.
Here is the text from the service receipt:
Performed A/C inspection and all vents appear to operate fine. No leaks seen. Lots of debris in front of the condenser. Suspect system low on Freon. Perform evac and recharge. Installed dye.
Pressures:
High: 130psi
Low: 15psi
Used 1.1lbs of freon then noticed the restriction. Removed freon. recommend replace expansion valve receiver dryer, flush lines and replace all necessary o rings.
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Trying to troubleshoot a very intermittent (has happened on two different occasions during the last 1,000 miles) hesitation from a stop-light. I've been recording engine parameters (Torque application) on both instances as these have been during longer trips after a period of highway driving. 2004 Excursion, 112K miles.
This feels kind of like severe turbo hesitation (4 to 10 seconds trying to start out before it kicks in) but I don't think that's it. The turbo is a new PowerMax turbo replaced 5 months ago. VGT readings seem pretty normal. The EGR valve is new -- the first instance was with the old and the second was with the new. I've also recently replaced the EGR and Oil coolers (before this).
Here's what's interesting in the captured data though... Normally when I coast into a stop-light the indicated engine load stabilizes at about 40-50% and VGT moves to about 65% to 70% at idle. The two different times this happened (actually multiple times at stop-signs/light close to each other over 5 minutes or so for both of these), when I have coasted to the stop, the engine load increases from low values during coast-down (0% during freeway coast-down or 19-30% during other coast) up to 99.6% (or other similar high values) at idle and VGT seems to be full closed at 85%.
There is absolutely no response to the throttle in this situation for 5-10 seconds. I've either been goosing the throttle a bit or putting it neutral and revving it up first to get things going again. When it finally catches and starts accelerating with power, indicated engine load drops to 50-60% again and VGT opens up to 40-60% or so. None of the other parameters I've been capturing seem to read strangely during this that I recognize. No issues observed during cruise and power seems good. No pending DTCs or engine light.
Here's what the data points I'm capturing (once each second):
Boost
Calibration Input Volts
ECT
EOT
Fan RPM
FICM main volts
Fuel Injector pulse width
ICP
ICP Volts
IPR Duty cycle
RPM
Engine Load
MAP
Trans Temp
VGT Duty Cycle
EBP
EGR Commanded
EGR Error
Added today but not captured during these issues yet:
IAT
IAT2
Baro
Accel Pedal Position
Mass Airflow Rate
Mass Fuel Desired
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2007 GS 350 109,500 miles. My heater was blowing cold at idle and warm when driving so I took it to dealer. To my surprise, dealer says its a blown head gasket. No other symptoms. No white smoke, no smells, no warning lights on dash, and running fine. Just had VVT gear recall done last week.
Fortunately I have Lexus extended warranty good thru 125k miles and Feb 2014. I do my own maintenance (plugs, oil changes etc). Have records for all. But have not done coolant change (due at 100k).
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2012 f250 SC xl 6.2 - Is it normal to hear a single clunk sound on occasion when accelerating from a stop sign? Doesn't happen all the time mind you and I don't ever remember hearing it in the past.
Now just today, while backing up my driveway, as soon as I started the reverse motion, I heard the same clunk. Sounds like metal to metal and comes from the rear of the truck.
Only 7000 miles on her and I treat her like a baby...anything I should be concerned with?
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Blows cold, so not a freon issue, but it will sometimes just suddenly stop blowing cold as if I punched the "A/C" button disengaging the compressor. Sometimes if I just wait a while it will come back on by itself, sometimes I have to stop and shut the truck clear off and take the key out, then start it back up and all is well again and it blows cold again.
High pressure switch failing???
BCM issue???
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My '06 GS450h has developed a fault where the heater blows cold at idle and low revs but blows warm when driving or revving the engine at a standstill. The coolant hasn't dropped at all and the car never goes above halfway on the temp gauge. Its starting to get frustrating now the cold weather has set in and temps dropping! Long journeys are ok as at high speeds it stays warm but short journeys are uncomfortable!
I just had a feel of the rad hoses and hoses that go into the matrix (engine side of bulk head) and matrix hoses feel warm (both of them), the top hose to the rad is warm but not hot and bottom hose is cold suggesting the stat hasn't opened yet. Its cold outside so getting the car up to temp is quite difficult without a long drive (rush hour at the mo).
Still I just had the car parked on the drive and cranked the heater up to max and held the accelerator for a while and super warm air blows out. The engine cuts back out as "normal operating temp" has been reached for battery mode and then the heater goes cool again! Still the bottom radiator hose is cool and top hose not massively warm. It has never overheated thus far and I drive 150miles a day back and forth to Reading from Cheltenham 4 nights a week.
Only thing I can think of is a sticky thermostat or water pump not operating sufficiently enough to circulate the water? Its getting colder and short trips where it used to blow warm air nice and quickly (within 3-5miles) are becoming unpleasant!
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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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