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post #1 of 8 Old 07-19-2009, 06:04 PM Thread Starter
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AC question

truck Ac works fine for 10-20 min then starts to blow hot air

early 99 f350 lariat stock other than 5" strait pipe my name is Jim I wont tell ya what the wife calls me
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post #2 of 8 Old 07-19-2009, 09:02 PM Thread Starter
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early 99 f350 lariat stock other than 5" strait pipe my name is Jim I wont tell ya what the wife calls me
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post #3 of 8 Old 07-20-2009, 05:25 AM
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have u looked at the ac clutch washer shim mod. Father and I both did it last week and gained alot more cooling. His clutch was slipping bad. We both gained 15-20 degrees of cooler air. At 106 air temp last week it was priceless
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post #4 of 8 Old 07-20-2009, 08:33 AM
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When its not blowing cold, is the compressor on? If its off check the low side pressure with one of those cheap gauges from autozone. My guess is that after a bit the pressure gets too low and the switch cuts it off. This would tend to mean low Freon, but only a little.

Just a basic 01 F350 CCLB SRW -Good from a far but far from good
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post #5 of 8 Old 07-20-2009, 05:36 PM Thread Starter
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Quote:
Originally Posted by Txangler View Post
have u looked at the ac clutch washer shim mod. Father and I both did it last week and gained alot more cooling. His clutch was slipping bad. We both gained 15-20 degrees of cooler air. At 106 air temp last week it was priceless
sounds interesting, whats involved.
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Originally Posted by tubular031 View Post
When its not blowing cold, is the compressor on? If its off check the low side pressure with one of those cheap gauges from autozone. My guess is that after a bit the pressure gets too low and the switch cuts it off. This would tend to mean low Freon, but only a little.
ya thats what I thought(low freon), but it blows quite cold for awhile then after 10-20 it blows WARM. I'll do those test,probably what it is




THANKS FOR THE I N F O guys

early 99 f350 lariat stock other than 5" strait pipe my name is Jim I wont tell ya what the wife calls me
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post #6 of 8 Old 07-20-2009, 06:23 PM
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clutch is located by the degas bottle. Should have a 8mm bolt in the center. turn truck and ac on to break bolt free. turn off truck/ac to remove clutch. washer is on the INSIDE of the clutch so remove carefully so u dont drop it. remove washer. reinstall in reverse order and check to make sure clutch engages and disengages with the engine running.
U should be using a digital temp gauge to get accurate and fast measurements before and after.
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post #7 of 8 Old 07-20-2009, 06:27 PM
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I had a similiar issue, it turned out to be the lowside sensor was going bad. I could touch it and re-engage the clutch, so 15 dollars later my a/c works all the time. just something to check out.



On vacation from a truck for a year or...
Looking at 6.4s Moving in a few months then hopefully buying my dream truck!!!

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post #8 of 8 Old 07-20-2009, 09:13 PM Thread Starter
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Quote:
Originally Posted by Txangler View Post
clutch is located by the degas bottle. Should have a 8mm bolt in the center. turn truck and ac on to break bolt free. turn off truck/ac to remove clutch. washer is on the INSIDE of the clutch so remove carefully so u dont drop it. remove washer. reinstall in reverse order and check to make sure clutch engages and disengages with the engine running.
U should be using a digital temp gauge to get accurate and fast measurements before and after.

[QUOTE=cchase;1309935]I had a similiar issue, it turned out to be the lowside sensor was going bad. I could touch it and re-engage the clutch, so 15 dollars later my a/c works all the time. just something to check .outQUOTE][/
I'll check that thanks

early 99 f350 lariat stock other than 5" strait pipe my name is Jim I wont tell ya what the wife calls me
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