Blue Wire Mod --Again--
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Logistics Pro
Joined: Mar 2010
Posts: 3,534
Likes: 497
From: NC
Blue Wire Mod --Again--
A/C was struggling at 97 degrees yesterday in the city, thinking about the Blue Wire Mod. I have been reading about it more and more. Besides mounting the switch without damaging my dash what are the other pros and cons. I am not a fan of damaging factory wiring harnesses so I will use a tap with a spade connector. Does it cause any issues with the truck?
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Logistics Pro
Joined: Mar 2010
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From: NC
Yes, it comes on and works normally, A/C just can't get cold in heavy traffic, does fine on the highway.
Fleet Mechanic
Joined: Nov 2012
Posts: 1,348
Likes: 110
From: Lakeland, Fl
I just replaced the the fan clutch on mine, fan wouldn't come on with ac on max. Ac was weak in stop and go traffic. Checked the fan speed, it stayed constant at 650 rpms. New fan clutch, now fan speed goes to max on max ac and holds 8-900 rpm at idle. Ac back working normal. Still putting off doing the blue wire mod.
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Logistics Pro
Joined: Mar 2010
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From: NC
When towing my fan ramps up at 207, I am running the 200 degree thermostat, engine temps normally stay between 200 and 204. I have replaced the fan clutch and watch the FSS PIDS seems to operate normally. I also replaced the pressure switch behind the compressor.
I am wondering if the condenser is restricted, the pressures don't show that or with the high humidity and hot car the system cannot keep up. Seems to cool nicely under 95 degrees.
I am wondering if the condenser is restricted, the pressures don't show that or with the high humidity and hot car the system cannot keep up. Seems to cool nicely under 95 degrees.
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Fleet Owner
Joined: Nov 2003
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That is why I do not switch to a 200*F thermostat. Some people claim more efficient running, but if it is, it is not even measurable.
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Hotshot
Joined: Dec 2014
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From: Jersey Shore
I’ve washed my condenser (and radiator) several times, when I've had the cooling stack both in and out of the vehicle. I’m always amazed how much dirt collects on them.
You can get coil cleaner at HD/Lowes and other places that is used on home A/C condenser coils. Its foaming and doesn't take long. For rinsing, you don't want a pressure stream, you want a shower spray.
You can get coil cleaner at HD/Lowes and other places that is used on home A/C condenser coils. Its foaming and doesn't take long. For rinsing, you don't want a pressure stream, you want a shower spray.
Laughing Gas
Joined: May 2017
Posts: 969
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I just replaced the the fan clutch on mine, fan wouldn't come on with ac on max. Ac was weak in stop and go traffic. Checked the fan speed, it stayed constant at 650 rpms. New fan clutch, now fan speed goes to max on max ac and holds 8-900 rpm at idle. Ac back working normal. Still putting off doing the blue wire mod.
Cargo Master
Joined: Aug 2003
Posts: 2,332
Likes: 442
From: Eastern Washington
Have you had the Refrigerant level checked?
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Logistics Pro
Joined: Mar 2010
Posts: 3,534
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From: NC
Been thinking abut switching out, Is there a decent OEM type that fails open and actually works?
Mountain Pass
Joined: Oct 2012
Posts: 233
Likes: 65
From: Southern Indiana
Be sure that the air blend door is working -- also check that the water valve is closing off with the AC on max
Wash out the air stack as was mentioned , and check for bent fins -- air gotta get thru there
Does the fan RPM increase when the AC is turned on ?
Wash out the air stack as was mentioned , and check for bent fins -- air gotta get thru there
Does the fan RPM increase when the AC is turned on ?
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Logistics Pro
Joined: Mar 2010
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From: NC
The fan does increase in speed some but not like a traditional clutch fan, the PCM has to command it. Funny, it only really acts up at 96 degrees and higher, today it is 87 and it will cool just fine. It has also been very humid and add that to 96+ degrees and sitting in the sun it takes a while for the colder air to flow.