A/C Question - Ford Powerstroke Diesel Forum

 
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post #1 of 9 Old 08-27-2008, 06:16 PM Thread Starter
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A/C Question

For the last 2 months or so, my A/C has been cycling from cold to warm. I can be doing 65 down the freeway, and it will all of a sudden drop 20-30 degrees. Usually after 4-5 minutes, it's blowing cold again. When it's blowing cold, it's pretty cold, so I wouldn't think it is low on freon. Anyone had this problem before, or have any suggestions?

Thanks,
Scott
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post #2 of 9 Old 08-27-2008, 06:32 PM
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i had a problem in my 01 where it would be really warm at idle and i pinched the heater hose on the passenger side of the truck and it worked im wondering if your problem could maybe have the same thing wrong with it just to a different extent...i dont know how to fix it cause i got rid of the truck before i had to fix it


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post #3 of 9 Old 08-27-2008, 06:42 PM
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Quote:
Originally Posted by GoldieStroker944 View Post
i had a problem in my 01 where it would be really warm at idle and i pinched the heater hose on the passenger side of the truck and it worked im wondering if your problem could maybe have the same thing wrong with it just to a different extent...i dont know how to fix it cause i got rid of the truck before i had to fix it
Funny you say this, I had a 99 gasser it would make funny noises and do this as well. The service manager clamped it and it went away, so it drove around with vise grips on the hose til I rolled it

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post #4 of 9 Old 08-27-2008, 06:43 PM
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search for the a/c mod, it involves installing a ford heater control valve and tapping into the vacuum system. shuts the coolant flow off to the heater core when a/c is selected.
$20 bucks and 30 minutes installation time

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post #5 of 9 Old 08-28-2008, 04:56 AM
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Originally Posted by choctaw View Post
Funny you say this, I had a 99 gasser it would make funny noises and do this as well. The service manager clamped it and it went away, so it drove around with vise grips on the hose til I rolled it
i also drove around for a while with vise grips we should start a club lol


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Foil delete
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post #6 of 9 Old 08-28-2008, 06:23 PM Thread Starter
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Originally Posted by GoldieStroker944 View Post
i also drove around for a while with vise grips we should start a club lol
Thanks for the replies. So what does the hose to the heater core have to do with my A/C though?

Thanks,
Scott
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post #7 of 9 Old 08-28-2008, 06:25 PM
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Thanks for the replies. So what does the hose to the heater core have to do with my A/C though?
there's always coolant circulating through the heater core whether the a/c or heat is selected.

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post #8 of 9 Old 08-31-2008, 11:16 AM
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Sounds to me like the compressor might be going out. I had one do this and there was metal shavings blocking the inline filter.Pressures would be all over the place.


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post #9 of 9 Old 08-31-2008, 01:47 PM
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Originally Posted by jbeasts10 View Post
Sounds to me like the compressor might be going out. I had one do this and there was metal shavings blocking the inline filter.Pressures would be all over the place.
this is very possible really you just have to start trouble shooting this is just like electrical stuff you just have to keep ruling things out till you the the problem


2003 7.3L
Crew Cab Short box
Lariat
Cowl (functional)hood
315/75-16 wild coutry A/T's
Hypertech power programmer 3
T.S 6pos
stock,high idle,50,75,100,140
AFE stage 1
Foil delete
MBRP Cool Duals 6" tips
Sirius sat radio
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