North American Turbocoupe Organization



Transmission cooler
firstsvo Offline
Senior Member
#1
'88 TC auto. The car doesn't go into lockup when it gets hot, been that way for a while. I thought it was due to the engine running hot, but tonight it was nice and cool out, engine temp was at its normal 210* but lockup worked perfectly, so I'm figuring it's the trans temp, not the engine temp that's the problem. The cooler on there now is about 11"X4". I was looking at a fluidyne cooler that is 14"X6.5" but a different design and supposedely 50% better cooling than the normal fin units. There are bigger coolers, but my concern is how big is too big as the car runs hot as it is in the summer (like 220*) and I don't want to block TOO much of the rad. Any ideas of what size is best and what brand and type? Thanks... Chuck
White '88 auto mostly stock, Black '88 5 speed nowhere near stock
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DonH Offline
Posting Freak
#2
Converter clutch lock up is controlled electrically by the by the EEC so the engine running conditions as determined by the various sensors is important in relation to the lock up function. Failure to lock up can be caused by malfunctioning ECT, TPS, MAP, or BOO as well as bad electrical connections to the lock up solenoid or to the failure of the solenoid. The other possibility involves contaminated fluid. The lock up will not happen if the EEC thinks the engine is too hot or not producing enough power.
1987 TC stock except ATR 2.5"
1983 Pontiac Transam T-top 5.7 T56 [email protected] top speed: 176mph
1978 Fairmont 2.3 4-spd Big-top S/W
1946 Willys CJ2A 134.2ci L4 No-top
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firstsvo Offline
Senior Member
#3
Then why does it work when the engine is hot but the air is cool? Also, if the car idles in Park to get up to temp.(like when I "burped" the radiator) it also worked. I am about 99% sure it's the tranny temp thats messing it up. I've been bitten by that 1% before on this car, but I'm pretty sure. Better tranny cooler can't hurt and it's pretty cheap, so I think I'm going to get that one and see what happens. Also, a tranny guy I mentioned this problem to said there was a temp sensor in the tranny. I don't know. Seems logical.
White '88 auto mostly stock, Black '88 5 speed nowhere near stock
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Jeff K Offline
Administrator
#4
The "old" not 100% electronic A4LD used in our cars does not have a temp sender in the tranny. The fully electronically controlled versions of the A4LD (4R44E, 5R55E, 5R55S) used in later model cars / trucks do have temp senders to measure tranny fluid temp.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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CougarXR7 Offline
Member
#5
You're correct about the design of the cooler.
A "stacked plate" design is more efficient than the traditional fin & tube style.
I put a 24k stacked plate on my '96 XR-7, which has the 4R70W transmission. This style and size is highly recommended from the MN12 people.
Did you bypass the stock cooler in your radiator?
1986 Mercury Cougar XR-7
5-Speed - Leather - Dual Manual Seats - Vent Windows - Smokin' T3
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firstsvo Offline
Senior Member
#6
No, that was my next question. I was not going to bypass it, but I wanted to know which line was in and out of the rad (as in is the top line going into or coming out of the rad) so I could have the cooler be the LAST thing before going back to the tranny. Thanks... Chuck
White '88 auto mostly stock, Black '88 5 speed nowhere near stock
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DonH Offline
Posting Freak
#7
While you are putting on the transmission cooler why not add a remote filter too. That wouldn't hurt either.
1987 TC stock except ATR 2.5"
1983 Pontiac Transam T-top 5.7 T56 [email protected] top speed: 176mph
1978 Fairmont 2.3 4-spd Big-top S/W
1946 Willys CJ2A 134.2ci L4 No-top
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firstsvo Offline
Senior Member
#8
Never thought of that. Good idea. What about the which line is the "in" at the rad.?
White '88 auto mostly stock, Black '88 5 speed nowhere near stock
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