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samuraidad
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Mar 5, 2014, 10:09 PM
Post #1 of 22
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A/c not cooling at idle
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My 2005 ford mustang 4.0 a/c has developed a problem at idle where the a/c temp increases from a normal of 40 degrees out of the center vent to 60 or 70 degrees. The high side pressure goes to 350 before the cooling fan kicks in. When the fan does kick in the engine shutters. The High side pressure switch was replaced with no change. The Freon was pumped out and 1lb9oz was refilled with no difference in pressure or cooling. Also on a cold start it may take up to 5 mins before any cooling is noticed
Do you have any thoughts as to what may be the cause. Could I be looking at a compressor failure? It is driving me crazy.
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Hammer Time
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Mar 6, 2014, 3:32 AM
Post #2 of 22
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Re: A/c not cooling at idle
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That is a 2 speed cooling fan system and you have likely lost low speed for one reason or another that still needs to be determined. This may also have done some permanent damage to the compressor.
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Hammer Time
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Mar 6, 2014, 11:06 AM
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Re: A/c not cooling at idle
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Tom Greenleaf
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Mar 6, 2014, 11:07 AM
Post #5 of 22
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Re: A/c not cooling at idle
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? Where did you get your data from and how well trusted? 40F outputs at center vent no doubt driving along would be considered excellent.
1.9 lbs. of refrigerant was filled? Added or from empty as I show 34oz total but charts default to under-hood hard data if any disputed info there.
350 PSI high noted? !! That's wildly too high of course. Full fan power should have been at work long before and seems more like you had little to none. I think HPCO should have shut down system right near that pressure or less.
Fan may or may not always be on high with A/C request or may even wait till it notes (computer controlled) high pressure that it's needed at all? No hard data for you on just how and what should happen when but as HT said this is hard on compressor and a problem lurks. Seek out why by your local A/C specialist will be worth it,
T
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samuraidad
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Mar 6, 2014, 7:14 PM
Post #6 of 22
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Re: A/c not cooling at idle
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Tom the a/c vent temp comes from my keeping a thermometer in the center vent since day one. Living in South Fl I like to know if there is a change that may be leading to a repair. That output temp was a constant 40 idle or highway until appx 3 weeks ago.
The 1lb 9 0z was obtained from All Data but not positive.
I know the radiator fan kicks in once the high side hits 350. That is why we replaced the high side switch. We use a motorcraft switch since the was no name brand switches available and a switch that was no name and $20.00 was something I will not gamble with.
As far as charging we used the recycling unit removed the Freon and recharged.
My buddy who is department head of Automotive technology is my go to guy but he to is stumped. getting a shop down here to check it out is around $90.00 and the dealer gets a min of $125.00.
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Hammer Time
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Mar 6, 2014, 7:20 PM
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Re: A/c not cooling at idle
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If the fan isn't coming on until 350, then you have no low speed and that's what needs to be resolved first. Where in South Florida are you?
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samuraidad
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Mar 6, 2014, 7:38 PM
Post #8 of 22
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Re: A/c not cooling at idle
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Boynton Beach
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Hammer Time
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Mar 6, 2014, 7:40 PM
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Re: A/c not cooling at idle
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LOL................ me too
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samuraidad
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Mar 6, 2014, 8:08 PM
Post #10 of 22
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Re: A/c not cooling at idle
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now that's a small world. I am out in West Boynton off Hypoluxo
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Hammer Time
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Mar 6, 2014, 8:10 PM
Post #11 of 22
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Re: A/c not cooling at idle
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I'm due east of there near Hypoluxo and Congress.
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samuraidad
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Mar 6, 2014, 8:15 PM
Post #12 of 22
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Re: A/c not cooling at idle
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near my favorite Duffy's
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Hammer Time
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Mar 6, 2014, 8:20 PM
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Re: A/c not cooling at idle
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Yeah, right in the strip center with Publix. I'm not too crazy about the service in that place.
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samuraidad
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Mar 6, 2014, 10:56 PM
Post #14 of 22
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Re: A/c not cooling at idle
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Never have a problem there. Could be because my son knows a lot of the staff.
Anyway I am going to stop by ford and see if there are any TSB covering this problem. 40 years ago I would have had it figured out but now with all the electronics and everything I have forgotten makes it hard for me now.
Have you seen the automotive tech academy at Park Vista High School on Jog?
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Tom Greenleaf
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Mar 6, 2014, 11:46 PM
Post #15 of 22
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Re: A/c not cooling at idle
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Last visit was Deerfield, Beach @ Boca line.
Back to this A/C. The charge weight should be listed under the hood on an OE sticker either radiator support or if OE some on accumulator. Alone not worried too much as I think you are low but symptoms are not consistent yet with that. Again, my chart showed 10oz more but would be way overcharged and all sorts of problems if wrong so all charts say use info under the hood first.
Low fan as your neighbor says needs to be on. You could duplicate with a strong floor fan or even hose off condenser watching BOTH pressures. I trust your observations and not sure why fan doesn't come on earlier OR why compressor stays engaged at all as the point of the high pressure switch is to shut it down and allow fan to quit if pressure is low enough naturally from driving along.
My guess is it's only coming on by heat for cooling system not regarding A/C?
More guesses: Charge is all wrong, two problems at once with the fan and charge? Relays inoperative or erratic, contamination? Fluke bit of solder or something blocking part of condenser? Condenser covered with bugs or in between it and radiator?
Wow - would be doing a lot of temp/pressure observations but somehow I don't think the charge is correct AND a problem with air flow.
Bit rare but that under bumper spoiler/air dam could impede proper air flow if torn off/missing.
Other oddities if possible at all: Fan spins wrong way? Sealer used - please say not a chance. Some other repair since there was no problem that might be involved?
Lots to check and a lot at risk if you don't get on this,
T
BTW: 350 high means condenser is close to engine temps so not good at all.
(This post was edited by Tom Greenleaf on Mar 6, 2014, 11:50 PM)
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Hammer Time
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Mar 7, 2014, 3:28 AM
Post #16 of 22
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Re: A/c not cooling at idle
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OK, lets put the charge weight to rest............... The correct charge is 31 OZ so he is correct on that.
This truck has an electrical fan issue that needs to be resolved before looking for anything else. I have supplied the wiring diagrams so that can be done. Low speed should be running basically all the time with the AC on. High speed only kicks in if the pressure hits 350 and that likely won't happen if low spped starts working.
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Tom Greenleaf
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Mar 7, 2014, 3:44 AM
Post #17 of 22
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Re: A/c not cooling at idle
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No rest yet. Top "My 2005 ford mustang 4.0 a/c"
Chart's funky on this and OP said 1lbs, 9oz installed? That's 25oz, + my chart suggests 34oz but to use info on the car first as always.
What happened? That much added or that much in total or info all messed up? Problem first or just after this. No low pressure ever mentioned or eyesight is toast again............ Tom
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Hammer Time
Ultimate Carjunky
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Mar 7, 2014, 4:13 AM
Post #18 of 22
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Re: A/c not cooling at idle
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The charge is 31 oz
1.9 lb
.9 kg
all the same and verified.
I believe he just confused 1.9lb and 1lb 9 oz
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samuraidad
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Mar 7, 2014, 2:19 PM
Post #19 of 22
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Re: A/c not cooling at idle
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you are correct on the 31oz fill amount. The under hood sticker is there. The design is just poor and after studying for a while I saw the amount. Hell getting old.
I am guessing there is an issue with the fan as I do not see a low speed only high. Guessing it may be the resistor and since the parts are all plastic and have age with 109,000 miles on them I may just replace the whole assembly to reduce the chance of future problems. I hate doing a job and then going back into it because of a few bucks.
Do you have any thoughts????
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Hammer Time
Ultimate Carjunky
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Mar 7, 2014, 2:35 PM
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Re: A/c not cooling at idle
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All you have to do is apply power to the Lt green/yellow wire to find out if the resister is bad.
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samuraidad
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Mar 7, 2014, 8:23 PM
Post #21 of 22
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Thank you. I am taking it over to the school tomorrow and we will check it out. Sadly my hands are not what they use to be thanks to an on the job injury back in 87. I let you know what we find
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samuraidad
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Mar 8, 2014, 6:29 PM
Post #22 of 22
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Re: A/c not cooling at idle
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well as we use to say in the business the plans were 07, meaning canceled as one of my dogs had a stroke today. Now shooting for Monday
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