Radiator purging after 5-10 miles
#1
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Radiator purging after 5-10 miles
Just installed a new radiator and cap, upper rad hose and the thermostat is a couple months old. I was hoping that it was just the undersized radiator that had been installed during the engine swap. So after dropping my kid off at school I get home, not a far drive at all, and of course I hear this familiar sound:
So the only thing I can think of at this point, is the water pump, which makes sense since the water is just boiling, and should be cooling down if its moving through the radiator. It doesn't happen super fast though, which kinda throws me, granted, this motor has 160K on it. Water pumps seem super cheap on the 2JZ which is nice, but no clue if that's gonna fix this.
The other thing I've read is the heater core valve, but I can't imagine that would be making me boil like this. At the point that I took this video, the car wasn't overheating yet. If I only drive a mile or two it doesn't boil. If I drive stop and go for a 15 minutes or so, the water starts to boils out, and once it hits a certain level, basically once its all purged out, then the temp needle shoots up.
So water pump you think?
So the only thing I can think of at this point, is the water pump, which makes sense since the water is just boiling, and should be cooling down if its moving through the radiator. It doesn't happen super fast though, which kinda throws me, granted, this motor has 160K on it. Water pumps seem super cheap on the 2JZ which is nice, but no clue if that's gonna fix this.
The other thing I've read is the heater core valve, but I can't imagine that would be making me boil like this. At the point that I took this video, the car wasn't overheating yet. If I only drive a mile or two it doesn't boil. If I drive stop and go for a 15 minutes or so, the water starts to boils out, and once it hits a certain level, basically once its all purged out, then the temp needle shoots up.
So water pump you think?
#3
live.love.laugh.lexus
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I just had a similiar issue. The coolant in the reservoir was boiling and spilling over but mines didnt overheat. The two big issues is researching this may be a result of air in the system, bad head gasket or heater core. Tested the heater core valve, which seemed fine and it appears I may have a bad heater core. Now, I have no heat (didnt fix that yet btw).
I changed the thermostat and topped off the fluid in the radiator in garage and no more boiling of the coolant in the reservoir.
I changed the thermostat and topped off the fluid in the radiator in garage and no more boiling of the coolant in the reservoir.
#6
Lead Lap
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Just installed a new radiator and cap, upper rad hose and the thermostat is a couple months old. I was hoping that it was just the undersized radiator that had been installed during the engine swap. So after dropping my kid off at school I get home, not a far drive at all, and of course I hear this familiar sound:
So the only thing I can think of at this point, is the water pump, which makes sense since the water is just boiling, and should be cooling down if its moving through the radiator. It doesn't happen super fast though, which kinda throws me, granted, this motor has 160K on it. Water pumps seem super cheap on the 2JZ which is nice, but no clue if that's gonna fix this.
The other thing I've read is the heater core valve, but I can't imagine that would be making me boil like this. At the point that I took this video, the car wasn't overheating yet. If I only drive a mile or two it doesn't boil. If I drive stop and go for a 15 minutes or so, the water starts to boils out, and once it hits a certain level, basically once its all purged out, then the temp needle shoots up.
So water pump you think?
So the only thing I can think of at this point, is the water pump, which makes sense since the water is just boiling, and should be cooling down if its moving through the radiator. It doesn't happen super fast though, which kinda throws me, granted, this motor has 160K on it. Water pumps seem super cheap on the 2JZ which is nice, but no clue if that's gonna fix this.
The other thing I've read is the heater core valve, but I can't imagine that would be making me boil like this. At the point that I took this video, the car wasn't overheating yet. If I only drive a mile or two it doesn't boil. If I drive stop and go for a 15 minutes or so, the water starts to boils out, and once it hits a certain level, basically once its all purged out, then the temp needle shoots up.
So water pump you think?
#7
do you notice if the fan turns on at all?
are you sure you bleed the system?
did you use oem parts or aftermarket parts?
new or recored radiator?
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#8
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Yes as mentioned, all the V8 stuff is gone. Its all new direct replacement parts. I didn't buy the radiator from Lexus, or the rad hose. As far as the air in the system, I didn't follow any special procedure, outside of the fact I filled it up, squeezed the hell out of the upper and lower hoses to burp the air out, and even ran a rad conditioner through it just to be extra thorough. This isn't air in the system, unless there's some crazy special tool that snakes in there to find a hidden giant air pocket or something, lol.
For the 2JZ, any special way to put water in the radiator? I should note, that yes the Fan does spin, and doesn't have a bunch of play like some I've seen. If I spin it to the left, it comes to a stop nice and quick like it should, and it spins consistently when the motor is on. Really the only thing it seems is that the water isn't moving through the system like it should be, and its just heating up, which could be a weak or almost dead water pump. Its certainly not a fully dead pump if anything, because it takes a good few minutes of driving to get to operating them. Car's I've driven with bad pumps before start pinning the hot needle after not long at all.
For the 2JZ, any special way to put water in the radiator? I should note, that yes the Fan does spin, and doesn't have a bunch of play like some I've seen. If I spin it to the left, it comes to a stop nice and quick like it should, and it spins consistently when the motor is on. Really the only thing it seems is that the water isn't moving through the system like it should be, and its just heating up, which could be a weak or almost dead water pump. Its certainly not a fully dead pump if anything, because it takes a good few minutes of driving to get to operating them. Car's I've driven with bad pumps before start pinning the hot needle after not long at all.
#10
Lead Lap
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Wow, you sure come across as cynical fella, my reading comprehension skills as solid I assure you. I am an ASE certified Master Tech, as stated in the TIS manual They want the heater core filled separately from the rest of the cooling system as to reduce the risk of an air pocket. Or was this too changed in his 2jz swap! The point being unless the water pump is leaking or has a bad bearing on the impeller shaft there is NOTHING wrong with it.
#11
Lead Lap
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Yes as mentioned, all the V8 stuff is gone. Its all new direct replacement parts. I didn't buy the radiator from Lexus, or the rad hose. As far as the air in the system, I didn't follow any special procedure, outside of the fact I filled it up, squeezed the hell out of the upper and lower hoses to burp the air out, and even ran a rad conditioner through it just to be extra thorough. This isn't air in the system, unless there's some crazy special tool that snakes in there to find a hidden giant air pocket or something, lol.
For the 2JZ, any special way to put water in the radiator? I should note, that yes the Fan does spin, and doesn't have a bunch of play like some I've seen. If I spin it to the left, it comes to a stop nice and quick like it should, and it spins consistently when the motor is on. Really the only thing it seems is that the water isn't moving through the system like it should be, and its just heating up, which could be a weak or almost dead water pump. Its certainly not a fully dead pump if anything, because it takes a good few minutes of driving to get to operating them. Car's I've driven with bad pumps before start pinning the hot needle after not long at all.
For the 2JZ, any special way to put water in the radiator? I should note, that yes the Fan does spin, and doesn't have a bunch of play like some I've seen. If I spin it to the left, it comes to a stop nice and quick like it should, and it spins consistently when the motor is on. Really the only thing it seems is that the water isn't moving through the system like it should be, and its just heating up, which could be a weak or almost dead water pump. Its certainly not a fully dead pump if anything, because it takes a good few minutes of driving to get to operating them. Car's I've driven with bad pumps before start pinning the hot needle after not long at all.
Last edited by ming15237; 06-25-14 at 06:21 PM.
#12
Lead Lap
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#13
Lead Lap
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Maybe the thermostat was installed backwards?
My car was actually doing the same thing after a month of swapping to a koyorad aluminum radiator. I realized my coolant was low so I topped it off. Figured I might as well pressure test it since its simple, sure enough found a leak on the lower radiator hose clamp. I just tightened it up and now it has been perfect.
Another thing to note, the Lexus radiator is a big hefty radiator, if you got an aftermarket one, i.e. AutoZone, Oreilley's, then you have significantly decreased the size of the radiator. That might be another potential issue. The radiator is to small to cool enough. But then again you said its after 3 to 5 miles which doesn't lead to radiator.
My car was actually doing the same thing after a month of swapping to a koyorad aluminum radiator. I realized my coolant was low so I topped it off. Figured I might as well pressure test it since its simple, sure enough found a leak on the lower radiator hose clamp. I just tightened it up and now it has been perfect.
Another thing to note, the Lexus radiator is a big hefty radiator, if you got an aftermarket one, i.e. AutoZone, Oreilley's, then you have significantly decreased the size of the radiator. That might be another potential issue. The radiator is to small to cool enough. But then again you said its after 3 to 5 miles which doesn't lead to radiator.
#14
Lead Lap
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My vote is for fan shroud missing. Does it overheat when you're on the freeway or at least long sections with no stops? That fan can spin 100,000 RPM and it won't matter because the majority of the air will take the path of least resistance which is NOT through the radiator.
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