4R100 Temp issues... any thoughts (Mark)??
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Posting Guru
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From: South Shore, MA
4R100 Temp issues... any thoughts (Mark)??
Bought this truck 2 months ago.... It runs fine, and shifts great.
2001 F250 7.3 / auto
(I have no idea what the trans builder did about the mechanical diode - but that's probably not my issue [yet])
Today while cruising with an EMPTY truck NOT TOWING and ambient air at 60F, the trans hit 190. I'm monitoring with an Aeroforce Interceptor via OBD.
My previous V10 truck would NEVER hit 190, even summer-month towing. So this alarmed me.
I found some reciepts in the glove box showing that the PO had the trans rebuilt about 6k ago. While under the truck I noticed the stock radiator-trans cooler has been disconnected. Lines have been cut, and bypassed to an aftermarket cooler, mounted behind the grill. It looks like it's the ONLY trans cooler being used - hack much??!!
So, Whats my approach??
Try to clean the radiator-cooler??
Is it worth trying??
If so, how?
I'm hoping to avoid replacing the radiator.
Thanks All
2001 F250 7.3 / auto
(I have no idea what the trans builder did about the mechanical diode - but that's probably not my issue [yet])
Today while cruising with an EMPTY truck NOT TOWING and ambient air at 60F, the trans hit 190. I'm monitoring with an Aeroforce Interceptor via OBD.
My previous V10 truck would NEVER hit 190, even summer-month towing. So this alarmed me.
I found some reciepts in the glove box showing that the PO had the trans rebuilt about 6k ago. While under the truck I noticed the stock radiator-trans cooler has been disconnected. Lines have been cut, and bypassed to an aftermarket cooler, mounted behind the grill. It looks like it's the ONLY trans cooler being used - hack much??!!
So, Whats my approach??
Try to clean the radiator-cooler??
Is it worth trying??
If so, how?
I'm hoping to avoid replacing the radiator.
Thanks All
Lead Driver
Joined: May 2007
Posts: 5,613
Likes: 9
From: Flagstaff, Arizona
sounds weird that they would bypass it, rather then run it in-line. Being new to this truck, and not knowing the history......I would remove the stock cooler, and have it flushed, and if it checks out okay, buy some fittings, and hook it into your aftermarket cooler in-line and double your cooling capacity. 190* won't hurt you, but empty, not towing that definitely seems high. Could be a problem towing if it makes a jump much higher then that. I am not familiar with the Aeroforce Interceptor being used via OBD, if that is an accurate way to get the temps or not......more will chime in soon I'm sure!
I have a Napa Ultra cool trans cooler installed in-line with the stock cooler, and I never see temps over 180-185* even in the heat of summer when towing
I have a Napa Ultra cool trans cooler installed in-line with the stock cooler, and I never see temps over 180-185* even in the heat of summer when towing
Posting Guru
Joined: Mar 2011
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From: Florida
I have a scangauge II which reads from the OBDII like the Aeroforce does. The trans. temp on the scangauge is typically around 10*F higher than the temp indicated by the Isspro EV2 with the sensor in the test port.
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From: South Shore, MA
Good to know.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
You need the radiator cooler. It's possible that the one in your truck is filled with debris from the old cooler. It may not be.
Is the aftermarket cooler a stacked plate or a tube and fin? The tube and fin coolers are low efficiency and high restriction. They should not be on your truck.
Is the aftermarket cooler a stacked plate or a tube and fin? The tube and fin coolers are low efficiency and high restriction. They should not be on your truck.
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Posting Guru
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From: South Shore, MA
You need the radiator cooler. It's possible that the one in your truck is filled with debris from the old cooler. It may not be.
Is the aftermarket cooler a stacked plate or a tube and fin? The tube and fin coolers are low efficiency and high restriction. They should not be on your truck.
Is the aftermarket cooler a stacked plate or a tube and fin? The tube and fin coolers are low efficiency and high restriction. They should not be on your truck.
Ill have to take a closer look at the aftermarket unit tomorrow and report back.
Posting Guru
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From: Florida
I was just driving the truck and realized that I had reported the temp spread backwards. Edited my post, sorry for the error.
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Post Fiend
Joined: Feb 2008
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From: Lancaster, Pa.
Just to clarify, my temps from both my scan gauge and Ispros trans temp gauges are right on. I had a different reading on both gauges like you mentioned back a few moths and it turned out to be a dirty sender connection under the truck to my pillar gauges. Cleaned the connection and their back reading the same.
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Post Fiend
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From: Lancaster, Pa.
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Posting Guru
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From: South Shore, MA
You need the radiator cooler. It's possible that the one in your truck is filled with debris from the old cooler. It may not be.
Is the aftermarket cooler a stacked plate or a tube and fin? The tube and fin coolers are low efficiency and high restriction. They should not be on your truck.
Is the aftermarket cooler a stacked plate or a tube and fin? The tube and fin coolers are low efficiency and high restriction. They should not be on your truck.
Maybe the Tru-cool 40K?
And, if the radiator cooler is contaminated, is that affecting the thermal bypass? Or is it transmission mounted?
Logistics Pro
Joined: Jun 2005
Posts: 4,243
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From: AZ
The bypass is at the rear of the tranny. I remember that when Ford put their rebuilt units in after the originals grenaded they put a Magnifine filter inline with the cooler to pick up any microscopic ferrous debris left from the last tranny. If it was me, I'd opt for a new radiator...I would just assume that there is debris in the original radiator cooler and I wouldn't take the chance that I could somehow get all the debris out. The consequences of debris getting into your new tranny is just too great for me. I have a 40K Trucool added with a JW tranny and I see the temps you have when I am pulling a load at 100 degrees at high-elevations (above 5000-ft).
Post Fiend
Joined: Nov 2007
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From: Payson, AZ
It is not a thermal bypass. It is a pressure bypass. It is designed to bypass the ATF cooling system in the event the cooling system becomes restricted or blocked. If the cooler system becomes blocked the rear of the tranny gets no ATF and will quickly burn up. The bypass diverts the ATF from the front to the rear of the tranny bypassing the cooler. The pressure bypass is there to try to prevent a catastrophic failure. I say "try" because without a means to monitor the tranny temp you would not know the bypass was operated and would continue to drive and the heat build up without the cooler can still damage or destroy the tranny.
Logistics Pro
Joined: Jun 2005
Posts: 4,243
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From: AZ
It is not a thermal bypass. It is a pressure bypass. It is designed to bypass the ATF cooling system in the event the cooling system becomes restricted or blocked. If the cooler system becomes blocked the rear of the tranny gets no ATF and will quickly burn up. The bypass diverts the ATF from the front to the rear of the tranny bypassing the cooler. The pressure bypass is there to try to prevent a catastrophic failure. I say "try" because without a means to monitor the tranny temp you would not know the bypass was operated and would continue to drive and the heat build up without the cooler can still damage or destroy the tranny.