7.3 fan conversion too cool?
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Laughing Gas
Joined: May 2017
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7.3 fan conversion too cool?
Is it possible that the 7.3 conversion can make my truck run too cool? It won’t get above 192 at idle. I did the conversion because I wanted to see if it would help the AC cool better but I’m seeing the same vent temps as I was with the electric clutch.
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Laughing Gas
Joined: May 2017
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yes 192. I was told in another post somewhere that my idle temp should be a tad higher like 194, I even think I saw that stamped on the thermostat.
More Turbo
Joined: Dec 2012
Posts: 538
Likes: 151
From: Warsaw KY
Gotcha. I wouldn’t be concerned a few degrees either way. The thermostat is mechanical and manufactured with varying degrees of quality and materials. 192 is good. Next time you might hit 194.
Laughing Gas
Joined: Nov 2020
Posts: 994
Likes: 367
From: Republic of Texas
With the differences in tolerances with the sensors and the thermostats both materials and age you are in the right area for that temp. I do not know what the fail specification on the sensors are but I would expect if you are within a couple degrees you are good to go especially if your cold checks are that close.
Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
The one downside I've always seen with the 7.3 fan is the ability to engage the fan based off AC pressures. The stock fan will be engaged at full speed by the PCM in conjunction with the AC high pressure switch, regardless of ECT temps. I don't have personal experience with how this works in reality with the 7.3 clutch but I would think the stock fan clutch would provide better AC performance than the 7.3.
The main reason people go to the 7.3 is that it engages sooner than the stock clutch and thus keeps ECT temps lower when towing, and it's also mechanical so if you've got wiring issues, EGR valve unplugged, etc you don't have to worry about it.
The main reason people go to the 7.3 is that it engages sooner than the stock clutch and thus keeps ECT temps lower when towing, and it's also mechanical so if you've got wiring issues, EGR valve unplugged, etc you don't have to worry about it.
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Laughing Gas
Joined: May 2017
Posts: 969
Likes: 30
The one downside I've always seen with the 7.3 fan is the ability to engage the fan based off AC pressures. The stock fan will be engaged at full speed by the PCM in conjunction with the AC high pressure switch, regardless of ECT temps. I don't have personal experience with how this works in reality with the 7.3 clutch but I would think the stock fan clutch would provide better AC performance than the 7.3.
The main reason people go to the 7.3 is that it engages sooner than the stock clutch and thus keeps ECT temps lower when towing, and it's also mechanical so if you've got wiring issues, EGR valve unplugged, etc you don't have to worry about it.
The main reason people go to the 7.3 is that it engages sooner than the stock clutch and thus keeps ECT temps lower when towing, and it's also mechanical so if you've got wiring issues, EGR valve unplugged, etc you don't have to worry about it.
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Laughing Gas
Joined: May 2017
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i guess my concern was the truck sewing 192 and adding fuel in an Attempt to get up to operating temperature.
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More Turbo
Joined: Dec 2012
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From: Warsaw KY
Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
When locked up the fan runs around 850rpm at idle (above engine speed).
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Laughing Gas
Joined: May 2017
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it’ll occasionally lock up to that speed but doesn’t always stay at it even with the ac on. EGR valve is plugged in.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Your at idle temp is fine.
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