[Charlilor]

We just found out that 2007 Sienna LE leaks from this radiator hose. I believed this is the return hose.

We took out this out from the radiator and it was very loose. That explains why it was leaking. We're not sure why it leaks in the first place. The question is, is there a way to fix this without placing the radiator? Right now, it seems the radiator thread was stripped.

If we can't easily fix this part, what radiator part number should we replace? Is this the radiator assembly, No. 2 part#: 160410P201 the correct part? This is a 2007 Sienna LE 3.5L, I think. Another question is, does this kit, part#: 160410P201, comes with everything I needed to replace this leaking hose radiator? Do I need to purchase the above nut bolt that I took out separately? Thank you so much for any tip!

 

[DC_Dave]

Has the radiator ever been replaced? If not, I have really good news! Your engine and transmission are probably still okay.

The fittings and hoses you have identified are for the transmission fluid pre-warmer/cooler inside the radiator. Transmission fluid flows through the fitting and hoses you have identified on the side of the transmission. Oftentimes, that circuit will fail, mixing transmission fluid and coolant. As you might imagine, this is good for neither the transmission, especially, or the engine and cooling system.

Our engine was overheated and ruined by an old radiator. Do a little bit of searching on the forums, and I believe that you will find that Gen 2 radiators are are considered a replacement item for regular maintenance. My opinion is they seem to last around 140,000 mi, and should probably be replaced at about 120,000 as a preventative measure.

Good radiators are not that much more expensive than cheap ones, so it probably makes sense to use a good one (we use denso). We also use OEM coolant - Aisin super long life.

2007 TOYOTA SIENNA 3.5L V6 Radiator | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

 

[BillG]

The threads really can't be repaired. Radiator replacement is definitely in order. The 2007 has (I think) three different possible radiator/bracket combinations, so you will want to shop by VIN from the dealer to get a part number before sourcing the Denso equivalent.

 

[Charlilor]

Has the radiator ever been replaced? If not, I have really good news! Your engine and transmission are probably still okay.

The fittings and hoses you have identified are for the transmission fluid pre-warmer/cooler inside the radiator. Transmission fluid flows through the fitting and hoses you have identified on the side of the transmission. Oftentimes, that circuit will fail, mixing transmission fluid and coolant. As you might imagine, this is good for neither the transmission, especially, or the engine and cooling system.

Our engine was overheated and ruined by an old radiator. Do a little bit of searching on the forums, and I believe that you will find that Gen 2 radiators are are considered a replacement item for regular maintenance. My opinion is they seem to last around 140,000 mi, and should probably be replaced at about 120,000 as a preventative measure.

Good radiators are not that much more expensive than cheap ones, so it probably makes sense to use a good one (we use denso). We also use OEM coolant - Aisin super long life.

2007 TOYOTA SIENNA 3.5L V6 Radiator | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

Thank you very much for the response. No, this radiator has never been replaced. I purchased the vehicle new. I hope this assembly includes all the fittings that's needed for the replacement.

 

[Charlilor]

The threads really can't be repaired. Radiator replacement is definitely in order. The 2007 has (I think) three different possible radiator/bracket combinations, so you will want to shop by VIN from the dealer to get a part number before sourcing the Denso equivalent.

Thank you for the tip. I did end up purchasing from the dealer with the assembly No. 2 showing in my initial post. I hope this comes with everything I needed to replace the existing one. This vehicle has had gargling or boiling noise for a year or so. I hope this noise was related to this leaking and once replace, it should go away.

 

[ericreyn]

So, for what its worth i did this on a 2009 a couple of months ago. 2009 change radiator
Buying the whole enchilada from toyota will most likely have everything you need.
i chose a cheaper but harder route. And Bill is right about the 2007 model year. There was a transition from one
configuration to a second one. The later years had one option only.

 

[bencahill]

Our engine was overheated and ruined by an old radiator. Do a little bit of searching on the forums, and I believe that you will find that Gen 2 radiators are are considered a replacement item for regular maintenance. My opinion is they seem to last around 140,000 mi, and should probably be replaced at about 120,000 as a preventative measure.

Do you have any idea how long the contamination may have happened before engine failure? I check fluids once a month and would notice if there was a difference in consistency. I wonder if that would give enough heads up to prevent catastrophe.

Also, I'm not sure I would agree that most on this forum would consider a radiator on Gen 2 as regular maintenance. Maybe others could confirm or deny this?

 

[ericreyn]

Do you have any idea how long the contamination may have happened before engine failure? I check fluids once a month and would notice if there was a difference in consistency. I wonder if that would give enough heads up to prevent catastrophe.

Also, I'm not sure I would agree that most on this forum would consider a radiator on Gen 2 as regular maintenance. Maybe others could confirm or deny this?

Mine was a slow leak for at least a year, and I was popping the hood almost daily to keep an eye on things. I would agree that it should be replaced at sometime. The 120,000 to 140,000 neighborhood is probably about right. Add the heater tee,s in too, they could cook an engine also if one goes and you don't shutdown fast enough.

 

[DC_Dave]

Do you have any idea how long the contamination may have happened before engine failure? I check fluids once a month and would notice if there was a difference in consistency. I wonder if that would give enough heads up to prevent catastrophe.

Also, I'm not sure I would agree that most on this forum would consider a radiator on Gen 2 as regular maintenance. Maybe others could confirm or deny this?

The original cause was a broken radiator filler neck that led to overheating and then a leaking radiator (in other locations). I'm sure you're right - most people on the Gen 2 forum probably don't think the radiator is a regular replacement item.

 

[bencahill]

The original cause was a broken radiator filler neck that led to overheating and then a leaking radiator (in other locations). I'm sure you're right - most people on the Gen 2 forum probably don't think the radiator is a regular replacement item.

Good to know. Our filler neck broke when I changed the battery just before a long trip. Fortunately, I noticed the night before the trip and was able to get it changed out thanks to a helpful friend and a parts store that was open late. I was very glad it was a small piece rather than the whole radiator!

 

[BillG]

The original cause was a broken radiator filler neck that led to overheating and then a leaking radiator (in other locations). I'm sure you're right - most people on the Gen 2 forum probably don't think the radiator is a regular replacement item.

Whether "most people" do or don't is probably NOT the right consideration. Most people probably SHOULD consider it a regular maintenance item. I've read countless overheated engine stories here because the radiator leaked and more than a few transmission failures because the radiator leaked in a different way. Most of the time, it happens somewhere in the 130-150k miles. Occasionally, someone will manage to get a high-mileage van further along before needing a radiator and others have a problem sooner. Mine has some wetness at the trans cooler lines and has for the last 20k miles or so. I keep an eye on it, but it's not getting any worse. I do have the Denso radiator in my cart every now and then, considering the replacement. I'll probably get it done this year, though.