5VZ-FE Oil Cooler
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19963.4lsr5
New member
Antifreeze leak on passenger side. Look at the coolant lines going to the throttle body and the heater hoses.
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lpsoldia311
Junior Member
Could possibly be your engine block freeze plugs
On one of my 3rd gen's had this issue when I bought it used in private sale, it was small enough that unless you looked perfectly through the wheel well or up at an angle from underneath the coolant would evaporate before it left the block. A lot of dried Toyota red coolant dye on the block once I found it.
Only reason I even started looking was because every 5-6 months I'd have to continually fill the coolant reservoir completely and even put in some right into the radiator, and my first 3rd gen barely needing topping off yearly. Engine ran completely fine with no codes/steam from exhaust/other indicators of blown head gasket/etc.
Finally ended up RTVing the hell out of it to stop the leak since I couldn't get any easy access to remove/replace it at the time. Looks like crap, but hasn't leaked in 3 years, though. I'm assuming the plug did it's job and expanded out when someone wasn't using anti-freeze mix in a past life, the RTV will still allow it to expand out if it had to.
On one of my 3rd gen's had this issue when I bought it used in private sale, it was small enough that unless you looked perfectly through the wheel well or up at an angle from underneath the coolant would evaporate before it left the block. A lot of dried Toyota red coolant dye on the block once I found it.
Only reason I even started looking was because every 5-6 months I'd have to continually fill the coolant reservoir completely and even put in some right into the radiator, and my first 3rd gen barely needing topping off yearly. Engine ran completely fine with no codes/steam from exhaust/other indicators of blown head gasket/etc.
Finally ended up RTVing the hell out of it to stop the leak since I couldn't get any easy access to remove/replace it at the time. Looks like crap, but hasn't leaked in 3 years, though. I'm assuming the plug did it's job and expanded out when someone wasn't using anti-freeze mix in a past life, the RTV will still allow it to expand out if it had to.
sleepydad
Senior Member
if the cooler was failing internally I would expect coolant in your engine oil, oil pressure can reach 70-80 PSI @ 3000+ RPM's. and oil in your coolant. they would be mixing and becoming one.
not that... the oil cooler could not go bad from age or corrosion, anything is possible I guess.
I would guess if your seeing coolant in that area? it's one of the hoses, there are 2. one from the thermostat housing and the other from oil cooler to the block.
if the union or o-rings that is holding the oil cooler is leaking it would be leaking oil.
if you have an internal failure of the oil cooler then your having a pink milkshake situation with your engine oil and that is going to be a very bad deal.
gamefreakgc
Elite Member
If it's in the front of the engine, it's most likely the water pump or where the cooler hose meets the water pump. If it's the middle/rear, yeah check the oil cooler lines.
All finished, here's the update.
It was the long cooler line where it goes into the cooler.
My valve covers leak a bit and over the years I'm guessing the oil made the hose swell. I was able to pull the hose off at the cooler without removing the clamp.
I replaced both cooler hoses as well as the cooler o-ring and bolt seal.
Instead of using Toyota U shaped hose 15777-62020 and long hose 15778-62030 I used Gates 18440 and 18457.
Reason I went with Gates was I'm in Canada and the OEM hoses from a local dealer would have cost 30.95 for the short one and 74.95 for the long one plus taxes would have been $120. Even Canadian mail order OEM hoses would have been $100.
I got both gates hoses from rockauto for about $30.00 cdn including shipping.
I'm confident the gates hoses will last a good long time.
The long gates hose was identical but did not have the protective covering. I'm not sure if the new OEM hose does. Anyway I transferred the cover to the new hose.
The U shaped hose had the right bends but was a couple of inches longer than the original so I cut it down.
The cooler was not leaking but I changed the o-ring and seal anyway.
In hindsight I would only change them if they were leaking. It was a total pia.
I ended up unclipping the wiring harness to get better access to the cooler, cooler bolt and hose clamps. I also unbolted the alternator and dipstick, again for better access.
It was the long cooler line where it goes into the cooler.
My valve covers leak a bit and over the years I'm guessing the oil made the hose swell. I was able to pull the hose off at the cooler without removing the clamp.
I replaced both cooler hoses as well as the cooler o-ring and bolt seal.
Instead of using Toyota U shaped hose 15777-62020 and long hose 15778-62030 I used Gates 18440 and 18457.
Reason I went with Gates was I'm in Canada and the OEM hoses from a local dealer would have cost 30.95 for the short one and 74.95 for the long one plus taxes would have been $120. Even Canadian mail order OEM hoses would have been $100.
I got both gates hoses from rockauto for about $30.00 cdn including shipping.
I'm confident the gates hoses will last a good long time.
The long gates hose was identical but did not have the protective covering. I'm not sure if the new OEM hose does. Anyway I transferred the cover to the new hose.
The U shaped hose had the right bends but was a couple of inches longer than the original so I cut it down.
The cooler was not leaking but I changed the o-ring and seal anyway.
In hindsight I would only change them if they were leaking. It was a total pia.
I ended up unclipping the wiring harness to get better access to the cooler, cooler bolt and hose clamps. I also unbolted the alternator and dipstick, again for better access.
19963.4lsr5
New member
My engine block is getting freshened up. I bought all new hoses and clamps and seals. 180 later I got all those hard to get too hoses and seals.
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