Weak AC fan - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 10-04-2019, 07:36 PM Thread Starter
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Hey guys, just picked up a new to me 2003 F350 4wd with the beloved 7.3. Love the truck so far but the AC definitely isn’t right. It blows ice cold but even on max level 4 it doesn’t blow hard enough to keep the cab cold during the day. I bought it in rough condition and my mechanic repaired a lot of stuff including the “evaporator, dryer, orphis tube,blower resistor and plug” per his invoice. I thought it might be the evaporator being blocked but it was replaced. Any ideas? Last truck didn’t have AC and I’m south Florida so I’m losing patience with this. Already dumped a ton of money into it so hoping it’s something simple I can handle.

Edit: All four speeds on the control work, one is almost nothing and the other two increase flow but are basically useless other than number four on max. Also seems like all blend doors are working, defrost, floor and all controls seem to switch properly. Thanks.

Last edited by magRT496; 10-04-2019 at 07:45 PM.
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post #2 of 19 Old 10-04-2019, 08:32 PM
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Back probe the fan connector at the highest setting. See if you have 12v

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post #3 of 19 Old 10-04-2019, 09:05 PM
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The blower itself could be on it's way out. Easy and cheap fix. Usually this is the time for them to go out.
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post #4 of 19 Old 10-04-2019, 09:09 PM Thread Starter
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Quote:
Originally Posted by kaya View Post
Back probe the fan connector at the highest setting. See if you have 12v
Could you specify which fan or where it’s locayed? Im new to these trucks. Have a multimeter so I’ll check tomorrow.
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post #5 of 19 Old 10-04-2019, 09:11 PM Thread Starter
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Originally Posted by DesertDiesel View Post
The blower itself could be on it's way out. Easy and cheap fix. Usually this is the time for them to go out.
Good point, the truck has 180k on it. Any way to confirm if thats the issue? It sounds like it’s working pretty hard and blows hard out of the floor vent but it’s hard to tell if it’s full power since I’ve never felt the ac in these trucks.
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post #6 of 19 Old 10-05-2019, 08:31 AM
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I've got a 2000 7.3 and live in Phoenix. My AC keeps my crew cab cold in 115 degree weather. Plus I'm lifted so it stays outside 100% of the time and gets incredibly heat soaked. Not sure of a way to check to see if it's the fan but it should blow hard on max cool out of the dash vents. Once you get this figured out you could also install the heater core mod which cuts off flow of the heater core to the dash when on Max AC. Great mod and works well.
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post #7 of 19 Old 10-05-2019, 08:32 AM
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turn from normal AC to Max AC, you should hear a healthy change in air flow from the dash
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post #8 of 19 Old 10-05-2019, 10:54 AM
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Quote:
Originally Posted by magRT496 View Post
mechanic repaired a lot of stuff including the “evaporator, dryer, orphis tube,blower resistor and plug” per his invoice.

Edit: All four speeds on the control work, one is almost nothing and the other two increase flow but are basically useless other than number four on max. Also seems like all blend doors are working, defrost, floor and all controls seem to switch properly. Thanks.
Was the resistor repaired, or replaced?
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post #9 of 19 Old 10-06-2019, 07:28 AM Thread Starter
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Originally Posted by Jjorgis5569 View Post
Was the resistor repaired, or replaced?
It was replaced.
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post #10 of 19 Old 10-06-2019, 07:32 AM Thread Starter
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Originally Posted by DesertDiesel View Post
turn from normal AC to Max AC, you should hear a healthy change in air flow from the dash
I played with the settings a little more you can definitely tell when it switches to max, it sounds like its blowing harder. Some other weird things i noticed were when switching from ac, front vents or max it will blow pretty hard at first then lose a little power. Also when i lay into the throttle it seems to blow harder. Now im wondering if its a vac line somewhere. It also seems to blow pretty hard on the floor but not out of the forward vents.
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