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09-02-2017
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I just registered
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Join Date: Feb 2017
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Radiators with/without engine coolers?
I have another question about my 1995 Toyota T100 3.4 L truck. I need to buy a new radiator for it and when I checked out the parts supplier outfits online, I noticed that some radiators come without transmission oil cooler/without engine oil cooler. Naturally, the radiators that come without engine oil coolers/transmission coolers are the cheapest. But I thought that the entire point of a radiator is to keep the engine cool, so why would they be selling radiators that don't cool the engine oil?
I am hoping that with a little care and maintenance, I can get another 100,000 miles out of my Toyota. Which type radiator should I buy? Can anyone explain this for me? Thanking you all in advance.
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Last edited by johnpham; 15-02-2017 at 03:59 PM.
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09-02-2017
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RubiconSlammer
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Join Date: May 2011
Location: Ipswich, Brisbane.
Posts: 1,250 What Jeep do I drive?: ZJ
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Running the tranny oil through the radiator serves 2 purposes, 1 to heat the tranny oil quickly in cold climates to increase efficiency of the tranny, and 2nd to keep the oil from getting too hot. Keeping the oil the same temp as the coolant is the aim. In hot climates like Qld the heating part is not really required, in fact some have been known to bypass the radiator and feed the oil through a add on oil cooler to keep the temps down. Places like Canberra and Melbourne would benefit from the heating side of things.
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'98 XJ (Deceased)
'04 KJ 2.4 L petrol(sold)
'98 ZJ current restoration project
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10-02-2017
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Senior Newbie
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Join Date: Aug 2012
Posts: 71 What Jeep do I drive?: WG
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The transmission with the oil cooler is designed for automatics. Without the cooler is for manuals. Autos produce more heat when in operation. For a car that is towing frequently, it would be advisable to have a separate cooler for the transmission as the extra heat can reduce the effectiveness of the radiator to cool the engine and cause overheating of the engine. It can also cause the transmission to overheat, like towing uphill, as it's not as efficient at losing heat.
A separate cooler also prevents the incidents of the tank rupturing internally. Usually results in pressurised coolant in the transmission fluid. Destroys clutch packs in the transmission. Some cars were more prone to this due to poor manufacturing. Check out R51 Nissan Pathfinders for a good example of transmission losses.
I'd also imagine the auto transmission fluid would be increasing the temp at the radiator before the thermostat opens and warm coolant passes through.
Last edited by silycr; 10-02-2017 at 08:40 AM.
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