Ford 6.7L Power Stroke Diesel :: A/C Just Suddenly Stop Blowing Cold Sometimes


Aug 18, 2014

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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So, trucks A/C is not blowing cold, and i replaced the compressor a couple years ago ( 40k miles?) took the truck to a shop to have them use one of them sniffers to check for a refrigerant leak. Was told that it needs a new evaporator core. Charged the truck up with refrigerant and it blew cold for a while but is now blowing hot again and it's summer time here in FL

So, replacing evaporator core here? I tried to find some how-to videos on youtube, but to no avail. I'd like to do it myself if possible. I think the shop quoted 3-400 in labor atleast.

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So my Ac is not blowing cold at all. I can hear the compressor cycling. I filled the sys with freon. Still not cold I am pretty sure I have a leak but wouldn't it still blow cold? What do I need to check to fix this? The temps are getting in the upper 90's and 100 s I need Ac bad...

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Ford 6.0L Power Stroke Diesel :: AC Will Blow Cold For About 3 Minutes And Then Stop For 10 Minutes

My A/C will blow cold for about 3 min. and then stop for 10 min......then cold again for 3 min.....then warm for 10 min.......what is going on ? It does this when on climate control and on A/C . I had a compressor go out about 1 1/2 yrs. ago due to a fan failing...the compressor tore apart... This is not acting like that though .

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After 2yrs and 1mo, my DC power 270XP amp died. I put the almost 10 yr old factory alt back on and everything is good again, except for the glaring fact that I have a dead alternator. It is a month beyond warranty (of course).

Truck has been running great. Oil cooler, EGR bulletproof cooler, STC done in Dec at Ford due to high deltas. I have a small stereo - one 12" sub woofer, otherwise nothing that really stresses the electrical system. I did the "big three" with 1/0 copper - cost a fortune, saw no difference - but that could have been an issue for the alt.

I left a message today with etch support but did not get a call back. I hope they make good on this - I waited almost 4 mo's to get this thing and it was supposed to outlast my truck.

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My 02 F350 7.3 new to me trucks ac stopped blowing cold. Not air gap issue (shims have been removed prior to my ownership-I pulled hub and checked), the charge is good (according to the shop I went to for evac and refill), and the compressor's cycling quickly. I'm no HVAC guy by any stretch. I have a cheapie gauge from days long ago that I connected to my low side port (which I know isn't definitive) and it reads from 25 to about 40/45 depending on the cycle.

Additional info that may not be anything:

1) Where the line goes from accumulator to evaporator the foam seal is slightly messed up and I feel ice cold air coming out of the housing.

2) The line is warm before the orifice and cold after it.

3) The lines going to the accumulator are both hot (after taking it to shop, before were lukewarm).

4) The condenser doesn't seem to have excessive plugging and I have rinsed it with garden hose sprayer with no difference.

5) The air from the vents blows good, just warm.

6) I've replaced the actuator for the blend door already.

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I decided I will be pulling the FICM again tomorrow and I will be sending it back to FICM repair.com for them to look at as I got a new one from them about 8 months ago. However if it is in case the wiring harness, where is a good place to look. I don't think it is the wiring harness as it seems to have voltage at the connectors.

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She'll crank, but not start.

Ever hear of this?

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I was out for a short drive this evening and got on it just a little bit to hear that wonderful 6.0 sound and all of a sudden coolant started spraying up on the windshield like I was spraying it from the windshield wipers! My first thought was oh crap I've got a blown head gasket and it puking from my degas bottle. I had a short drive to the house so I eased it on home. My ECT got to 226 with the fan roaring but not cooling it down, luckily it never got over 226. When I got home I opened the hood expecting to see where a bunch of coolant had puked from the degas but instead I saw this. What could cause the radiator to rupture like that? I did spend a good amount of time on my knees on top of the radiator while changing out my oil cooler the first time, then again when I installed my BPD oil cooler. Also I posted in another thread a few days ago about my ECT temps being a little higher than normal, reckon my radiator was clogged and that caused the higher temps and the rupture?

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Well it's that time of year to start using my air conditioning. Went to use it today and it is blowing nothing but warm air. Worked perfectly last time I used it last year. I thought about buying that 134a ac recharge kit from auto zone.

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Ford 7.3L Power Stroke (1999-2003) :: CEL / Rough Running / Smoke Blowing When Cold

I had been fighting some problems with injectors for several years. I didn't have time to dig into it. I knew what I needed to do, just needed to find time to do it. I honestly thought it was and injector and thought I would have to go to new sticks because I've had so many problems with the remans.

Well I finally had time last week. I pulled the passenger side valve cover and ohmed the injectors. It would be almost impossible to get the leads in the injector while installed the truck. I kept an old valve cover harness, so I cut a pig tail off of it and plugged it into the injectors so I could test. You can see the meter attached to the pigtail in the pic.

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When Cold, and when I start out as I open the throttle, it suddenly sounds like there is not a piece of quieting stuff on the engine. I mean its like I can hear right into the engine itself.

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