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Auto Transmission cooler lines[ALL/1998] posted by Norm Lizotte on
Tuesday, 14 October 1997, at 10:13 p.m.
I have three Volvo sedans, a 1987 240DL, a 1992 940GL, and a 1993 240DL, all with the 4-speed automatic transmissions. I want to install an automatic transmission oil cooler on each of them.
Hope this doesn't sound like too dumb a question. Of the two auto transmission oil cooler lines that run to the radiator, how do you tell which is the supply (to the radiator) and the return (from the radiator)? I haven't been able to tell by feeling the temperature of the lines with my hand with the engine running after a short trip.
Also, what's the best way to hook up the auxilary transmission oil cooler to these lines? Is the auxilary cooler installed in series with the radiator cooler, and if so, before or after the radiator cooler? Or does the auxilary cooler bypass the radiator entirely? Any help/advise on fittings & hoses and plumbing tips?
Thanks in advance for any help.
Norm Lizotte
Re: Auto Transmission cooler lines[ALL/1998] posted by Roy on
Wednesday, 15 October 1997, at 1:11 a.m.
Take the top line off and have someone bump the starter, it will be messy but oil should squirt out of the radiator. This is the line going back to the transmission. Attach the cooler to the line coming out of the radiator, route the cooler's hose as best you can and avoid sharp corners cutting the rubber hoses. The line coming out of the cooler goes to the return line (metal) for the transmission. You will probably need two adaptors for the transition from rubber to metal line. Volvo's use fittings alot like Ford's '85-'87.
I talked to the tech people at DAYCO, they make coolers and others put their name on 'em, Anyway this guy said they don't recommend by-passing the radiator's cooler because the oil needs to be in a certain temperature range. Using only an external cooler would result in oil that's to cool in the winter. He also said the stright tube kind are not as efficient as the cross flow types. The C/F are OEM on Ford trucks, so the must work well. I used the C/F on my cars.
I mounted them on the right side and used metal brackets that came with the cooler. Volvo had already drilled some holes in the right places.
Hope this helps.
Roy
Re: Auto Transmission cooler lines[ALL/1998] posted by Joseph Kmiec on
Wednesday, 15 October 1997, at 11:13 a.m.
The upper line on the radiator is the return line.
I installed my cooler (in 740) in front of the electric fan.
Tekonsha makes good trany coolers. Their coolers are self-regulating and they come with the right fittings and hose. The one I have (#4338SR) is 12"x11"x3/4"thick and has a 21800 BTU/hr heat rejection; and is rated for 24000 lbs GCWR (gross combined weight rating) so it is a heavy duty one.
One time I run an experiment, I measured the trany temp. line in a summer after about 40min of driving in a city. Before I installed the cooler the trany temp. line was about 92C (198F) and after instalating the cooler (driving in the same conditions) the temp. dropped to 62C (144F).
I run their cooler with synthetic ATF (AMSOil) in -35F and no problems.
One more thing Tekonsha makes good in-line trany filter (w/strong magnet inside) it is called MagFilter, take a look at it.
Joseph Kmiec