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#1 |
Registered User
Join Date: Apr 2010
Location: Raleigh NC
Posts: 157
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Howdy, I have added an external trans cooler and filter to the nose of my '71 C10. The outfit that I got It from, Makco Distributing, strongly suggests a "cooler bypass" for very cold starts. I don't mind adding it if it is really needed, but the original "in the radiator" cooler doesn't seem to need it. Are these guys just trying to stick their hands deeper in my wallet, or do I need to look into this further? My flow pattern will be through the filter then original rad cooler then through the add-on cooler. Comments or thoughts?
Thanks |
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#2 |
Senior Member
Join Date: Apr 2002
Location: Help! I'm in an office park with its own network of freeways!
Posts: 470
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Re: Transmission Cooler Bypass?
IMO, the bypass (add-on cooler only) would be handy if you see temps below 40 or so.
There's no bypass for the radiator cooler because that one doubles as a trans fluid warmer during cold weather running.
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'67 C20--427 tall deck/SM420, 4.10 HO52 (Michigan has not been kind to the Old Man) '95 Caprice--355 LT1/T56/3.42 8.5" 10-bolt (daily driver, almost 300k on the chassis) '07 Outback--wife's car. 125k & counting. No head gasket or transmission issues yet. *fingers crossed* |
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#3 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Transmission Cooler Bypass?
i would route it through the original cooler (rad) last. No need for a bypass at all
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#4 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Transmission Cooler Bypass?
Longhorn has it right. Radiator cooler last. This also has the advantage of putting LESS heat into your cooling system when you are running hard and hot.
Ray |
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#5 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Transmission Cooler Bypass?
when i lived up north in newyork i never had a cooler bypass the tranny worked fine even in below zero temps
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#6 | ||
Champagne Taste on Beer Budget
Join Date: Dec 2008
Location: High Ridge, Missouri
Posts: 2,190
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Coming Soon: Project 1970 Country Truck |
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#7 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Transmission Cooler Bypass?
This is how one transmission website shows it . It looks like the fluid routes to the radiator and then to the air cooler. I don't think it makes much difference but the trans fluid will transfer heat faster to the radiator fluid than it will to the air around the cooler.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#8 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: Transmission Cooler Bypass?
I doubt the coldest start in North Carolina is any where near where I've run my truck. I have an external cooler and no bypass.
I do know a guy that has an "H" plumbed into his system. He completely bypasses the coolers (radiator and external) on really cold days. Plumbing wise you want the external cooler before or after the tank in the radiator depending on where you live. Up north here you run the hot tranny fluid to the external cooler then to the tank in the radiator. This keeps the fluid a touch warmer. You can get it too cold. Guys in hot climates will want to run it to the radiator then to the external cooler for maximum cooling effect. Back to the bypass question. If you go without one, just wait until the truck warms up a tad before you take off if you're worried about it.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#9 |
Registered User
Join Date: Apr 2010
Location: Raleigh NC
Posts: 157
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Re: Transmission Cooler Bypass?
@VetteVet, Thanks! I have that diagram and instructions that came with the cooler, and that is the way I plumbed it. I was just curious about the by-pass. At this point, I'll save the $35 and wait and see.
@mrein3, You got that right! We have a LOT more days over 90 than under freezing! Thanks! @everyone else, Thanks for the input! |
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#10 |
Registered User
![]() Join Date: May 2007
Location: Rapid City South Dakota
Posts: 2,359
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Re: Transmission Cooler Bypass?
I just put a piece of cardboard in front of my trans cooler in the winter.
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Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299 |
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