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Coolant hose under intake

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Old 02-20-18, 11:21 AM
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Loc12
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Default Coolant hose under intake

Hi guys I have a 1994 lexus es300. I just replaced my spark plugs without removing the manifold and now I noticed that there was a coolant leak under the manifold mainly on the driver side. Is there any other coolant hose line other than central coolant hose?
Old 02-20-18, 11:34 AM
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LeX2K
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Depends on what you mean by "under the manifold". The bypass hose under the intake manifold is a common leak point on these engines see here 16261G in the diagram part # 16261-20010
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Old 02-20-18, 09:36 PM
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Loc12
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I found the leak it's on #13 on the diagram below.



Is this repairable or do I need to replace the whole thing?
Old 02-20-18, 10:22 PM
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LeX2K
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That hose is for the hydraulic fan motor (driven by the power steering pump) so you don't have a coolant leak?
Old 02-22-18, 08:36 PM
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Loc12
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Originally Posted by Lexus2000
Depends on what you mean by "under the manifold". The bypass hose under the intake manifold is a common leak point on these engines see here 16261G in the diagram part # 16261-20010

upon further inspection. You are right this is the one that’s leaking. Is there an easier way to replace this hose without taking out the intake manifold?
Old 02-23-18, 07:09 AM
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LeX2K
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Originally Posted by Loc12
Is there an easier way to replace this hose without taking out the intake manifold?[/left]
No the plenum and intake have to be removed. While you're doing the job replace the knock sensor harness they commonly go bad part # 82219-33020
Old 02-23-18, 09:34 AM
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HomerJay
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Excellent advice to replace the knock sensor harness while the intake is removed.
Old 09-12-24, 05:05 PM
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thatshtboxES300
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Originally Posted by LeX2K
Depends on what you mean by "under the manifold". The bypass hose under the intake manifold is a common leak point on these engines see here 16261G in the diagram part # 16261-20010
I currently have a huge leak currently there

Old 09-12-24, 05:07 PM
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thatshtboxES300
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Originally Posted by LeX2K
No the plenum and intake have to be removed. While you're doing the job replace the knock sensor harness they commonly go bad part # 82219-33020
currently have knock sensor #2 out along with the coolant leak from under the manifold
thx for advice boutta start taking shi apart tomorrow
Old 09-12-24, 05:10 PM
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LeX2K
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Coolant hose is a straight forward repair, knock sensor code can be a huge pain and expensive. If you find the knock harness with heat damage it's probably fine just to replace it and leave the sensors alone, if not then you're looking at replacing both knock sensors. If you don't use OEM you will be doing the job twice. If you buy "OEM" from Amazon or Ebay you will probably be doing the job twice.
Old 09-12-24, 05:40 PM
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thatshtboxES300
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Originally Posted by LeX2K
Coolant hose is a straight forward repair, knock sensor code can be a huge pain and expensive. If you find the knock harness with heat damage it's probably fine just to replace it and leave the sensors alone, if not then you're looking at replacing both knock sensors. If you don't use OEM you will be doing the job twice. If you buy "OEM" from Amazon or Ebay you will probably be doing the job twice.
I very much appreciate the advice slightly new to working on this car I shall def take this seriously
Old 09-13-24, 10:51 AM
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Yes, all genuine Toyota parts under the manifold, including manifold gaskets. While you're in there, good time to replace the thermostat and gasket.

I have a 96 ES300, and I do all the repairs, but not paint and body. You can always get good advice here, but feel free to contact me about repair, etc. We share just about everything on the car. What state do you live in? I have the leather rear seat in excellent condition, lower and upper. Apologies for the sales pitch.

Last edited by bc1_2002; 09-13-24 at 11:16 AM. Reason: don't need comment on spark plugs
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