Trans cooler solves TC lockup problem - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-02-2006, 04:41 PM   #1
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Default Trans cooler solves TC lockup problem

I am one happy camper today. I hope this fix will help others with the same problem. When my '95 SLE got hot, usually after about 45 minutes of driving, the torque converter would not stay in lockup. As a result, at 65 mph the tach would jump from 1900 to 2800 rpm and stay there for the rest of whatever trip I was taking. The TC would not lock up again until everything had cooled down.

Not sayin' it will work for everyone, but I installed a Long (brand) low pressure drop, stacked plate transmission cooler, (willwren recommended the type) and now my trans stays in lockup even when the car is good and hot, and the AC and cruise are on. My oil pressure is even higher than it used to be, and I am still running my wintertime 195* thermostat. Everything must be running a little cooler. Boy, I wish I had installed this thing a lot sooner.

I did not buy the biggest unit, but the one rated at 13000 Btu. The design of this cooler eliminates the need for valves or thermostats for cold and hot weather, it controls flow by the viscosity of the oil. The unit is very well made. It cost me $56 delivered to my door with all the necessary fittings and tubing and took less than an hour to install. I mounted it right in front of the passenger side fan. Here is the link to the product:
http://www.bulkpart.com/Merchant2/me...duct_Code=4454
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Old 08-02-2006, 05:57 PM   #2
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Glad to hear it Bill... These transmissions get too hot in the spring summer months... I had some shudders and the like from my TCC at one point a few years ago... And after a bit of driving around town the trans would get a little shifty with me... I installed my cooler well over 3 years ago, and it has kept the trans happy...

After replacing the Radiator I have now Bypassed the internal cooler and ran a straight shot to the AUX cooler... Now as hot as it is the trans stays at 150-160F, and the engine stays at 179-180F...lol

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Old 08-02-2006, 07:39 PM   #3
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Good cooler. This is the Zilla'*. Rated for 28000GVWR. It does help the whole drivetrain stay cooler. Not just the trans.
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Old 08-02-2006, 07:42 PM   #4
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That'* great, hope mine doesn't have that problem when she'* on the road.
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Old 08-02-2006, 09:55 PM   #5
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That'* good to hear for people with TCC problems. What determines whether a car got a cooler from the factory or not? My SSE has one but i never noticed any RPO code that called for one or anything else special.
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Old 08-02-2006, 10:14 PM   #6
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I believe all of the Bonneville SSE or SSEi'* with the series 1 engines got the HD cooling I think the RPO is V08

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