Engine Cooling System Problems of Toyota Sienna

Toyota Sienna owners have reported 22 problems related to engine cooling system (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Toyota Sienna based on all problems reported for the Sienna.

car image   Engine Cooling System problem of the 2005 Toyota Sienna 1
Failure Date: 11/03/2016

The contact owns a 2005 Toyota Sienna. The contact stated that while driving at various speeds, there was an abnormal smoke odor emitting from the front of the vehicle. The vehicle was not diagnosed or repaired. The vehicle was not included in NHTSA campaign number: 11v539000 (engine and engine cooling). The manufacturer was not notified of the failure. The approximate failure mileage was 107,000.

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car image   Engine Cooling System problem of the 2008 Toyota Sienna 2
Failure Date: 09/06/2014

The contact owns a 2008 Toyota Sienna. The contact stated that white smoke appeared from the rear of the vehicle. The contact heard an abnormal noise coming from the engine, but no warning indicators illuminated. After driving the vehicle home, the contact noticed that oil spilled all over the driveway, hood of the vehicle, and the front passenger side tire. The vehicle was towed to the dealer who stated that the oil cooler supply line burst. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was 74,000.

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car image   Engine Cooling System problem of the 2007 Toyota Sienna 3
Failure Date: 05/06/2014

With no warning at all the engine cooling lines just ruptured in my drive way spilling oil all over the front of my house on the concrete and I have seen people on line with less mileage then my 07 Sienna xle having the similar problem something about cheap rubber was used to make these lines there is even a you tube video on this matter . . This a safety concern glad it happen in front of my house instead of on the road with my family on board .

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car image   Engine Cooling System problem of the 2004 Toyota Sienna 4
Failure Date: 06/08/2011

Radiator leak, continuous problem. Could cause catastrophic engine failure. Toyota will not address repair.

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car image   Engine Cooling System problem of the 2004 Toyota Sienna 5
Failure Date: 07/20/2010

2004 Toyota Sienna - air conditioning compressor blows causing alarming noises while driving.

car image   Engine Cooling System problem of the 2004 Toyota Sienna 6
Failure Date: 06/01/2010

A/c went out at 70k for my 2004 Toyota Sienna. Never had a problem until now over $3000 to fix.

car image   Engine Cooling System problem of the 2004 Toyota Sienna 7
Failure Date: 04/25/2010

2004 Toyota Sienna. Original radiator replaced due to leak @ 21k miles. Radiator replaced a second time due to leaks at top l & r sides, near end tanks @ 80k miles. Radiator is now in need of another replacement @130k miles due to leaks at the same location. All radiators have been replaced by Toyota dealer.

car image   Engine Cooling System problem of the 2005 Toyota Sienna 8
Failure Date: 02/01/2010

The radiator on my 2005 Sienna developed a crack on the plastic end cap at 54,00 miles. A three inch crack. I had no indication of a problem developing it happened quickly and left my wife stranded. I was informed by the dealer that it was not under warranty because it is not part of the drive train. Therefore the 60,000 mile warranty did not apply. A friend told me that his 2005 Sienna was covered by and extended warranty because Toyota identified a problem with radiators cracking. I sent my comments/complaint to Toyota who, as usual denied my claim. They said the extension only applied to 2005 Siennas manufactured before September and guess my Toyota was manufacturer's after that date. I guess they did not fix problem for vehicles after September like they thought. I completed the repair myself.

car image   Engine Cooling System problem of the 2004 Toyota Sienna 9
Failure Date: 10/01/2009

Engine overheated on numerous occasions, slow loss of radiator coolant noted, and 2 engine thermostats replaced before cracked radiator was discovered. While owner was investigating problem, it was discovered that Toyota issued a couple of years ago a TSB and a limited warranty extension to replace radiators from this year (2004) and the next (2005) of the Sienna van. However, we have been only owner of this van and have received every other notice from Toyota regarding this model year of van including the bad door hinges (replaced under warranty), gas struts on rear hatch (replaced under warranty), and bad seat belt bezel (replaced under warranty) - but we never received any notice of the radiator issue - our radiator is now damaged beyond repair and needs replacement and Toyota will not replace even though this is apparently a well known issue at Toyota. There should be a full recall on this item given the amount of known bad radiators out there. This is a safety issue as the radiator is prone to sudden and catastrophic failure. The only known repair is to replace the radiator. There is extensive online documentation of this issue - but Toyota continues to stonewall most owners on this problem due to the expense (this is much more expensive to fix than the bad hinge, gas strut, and seat belt bezel that did have safety bulletins issued on them. . Read more...

car image   Engine Cooling System problem of the 2005 Toyota Sienna 10
Failure Date: 09/15/2009

2005 Toyota Sienna xle awd - slow leak in radiator consistent with TSB regarding cracking of plastic in cold weather conditions lead to overheating of vehicle. Radiator was replaced ($600+) as well as heads needed to be removed and milled ($2000+).

car image   Engine Cooling System problem of the 2004 Toyota Sienna 11
Failure Date: 08/18/2009

Check engine light came on in 2004 Sienna le, called dealership for appt, the next day, the air conditioning went out. I live in phoenix, az, where it is routinely 115 in the summer. Took car van to dealership where price to fix is $4200. Compressor exploded and sent shards of metal throughout entire a/c system. Toyota is aware of this problem, as posted in their TSB ac003-05, but refuses to cover their defect under a recall as it's not life-threatening. Let me tell you, riding in a car for any length of time in 115 degree weather is life-threatening. A/c is not a luxury in az; it is necessary for survival. Upon contacting Toyota customer service, they deny any culpability; however, there are plenty of forums, including Toyotanation. Com, in which people have routinely had this problem with this vehicle. Would like Toyota to issue a recall for their defect and take care of their customers. They are aware of the problem and to deem it non-life-threatening is a mistake. Most people who own Mini-vans are transporting children and it doesn't take much for children to overheat in a non-air conditioned car, not to mention the mild heat exhaustion that comes from being in the car for 15 minutes. Car is still not fixed due to exorbitant cost and it is well over 100 here still in September.

car image   Engine Cooling System problem of the 2006 Toyota Sienna 12
Failure Date: 08/14/2009

Driving my 2006 Toyota Sienna on a busy freeway with three children ages 1, 7, & 10 when the air condition compressor decided to seize up causing the belt to burn and eventually snap. The burning belt resulted in a little smoke and a fearful smell filling the cabin. Fearing a fire, I was forced to pull off the road putting myself and my three children in harms way. After determining there was not a fire, we climbed back in the van and continued on our way. After a little research, I've learned the compressor problems are not uncommon in Toyota Sienna. In my case our vehicle had less than 45k miles. Seems there are many unsatisfied Sienna owners who have experienced a similar problem, and Toyota should consider recalling all vehicles with this air conditioning system. I feel this is a major safety concern since the Mini-van is considered a family vehicle.

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car image   Engine Cooling System problem of the 2004 Toyota Sienna 13
Failure Date: 07/30/2009

The air conditioning in our 2004 Toyota Sienna le stopped blowing cold air at 75,000 miles. It sometimes remains cold for a minute or so and then goes right back to just warm air. It occurs every time the car is started.

car image   Engine Cooling System problem of the 2005 Toyota Sienna 14
Failure Date: 07/18/2009

A/c compressor failure on 2005 Toyota Sienna le minivan.

car image   Engine Cooling System problem of the 2004 Toyota Sienna 15
Failure Date: 07/01/2009

My air conditioning failed on my Sienna Toyota van. I had my mechanic unplug it. I did not have any damage but can no longer use ac. On line, I found many other Sienna 2004 owners with similar complaints. Some had cars stopping. Toyota never issued a recall but did a bulletin. The cost is tremendous to fix.

car image   Engine Cooling System problem of the 2005 Toyota Sienna 16
Failure Date: 06/02/2009

The a/c in my 2005 Toyota Sienna started blowing hot air out of the driver side vents. The compressor kept kicking on and off. This occurred everytime I used the a/c. After replacing the compressor twice, we still have problems with hot air coming out of the vent while the a/c is on. Now the van today 4/5/2010 has completely stopped blowing cold air and only blows hot air when the a/c is turned on. We took it to the dealer and were told the a/c pulley has not burned up. There was a technical service bulletin on this issue. Toyota technical service bulletin ac003-05 but it only covers vehicles until 36,000. Since the problem occurred after that mileage, we are not covered. This is the third major issue I have had with this 2005 van. I have had the back door gas shocks replaced under a recall and the entire front driver's door replaced under a recall. The fix for the a/c is estimated at $4,000!.

car image   Engine Cooling System problem of the 2005 Toyota Sienna 17
Failure Date: 02/13/2009

Radiator on 2005 Sienna sprung a leak and drained the coolant dry within a half day. Engine overheated and vehicle had to be stopped on roadside. Water was poured to replace missing coolant allowing owner to get home. Brought to Toyota service center the next day. Owner opted for a non-Toyota replacement radiator (owner was told the old radiator was beyond repair) since a Toyota part would have taken days to procure. Two such replacements were attempted to be installed. Neither one fit. Not only was a Toyota radiator unavailable immediately, it cost $200 more. Owner had to be without transportation for at least 4 days at his expense (a rental). Extended warranty expired at 100,000 miles; incident happened at 104,000 miles.

car image   Engine Cooling System problem of the 2001 Toyota Sienna 18
Failure Date: 10/27/2005

At 54,525 miles, the check engine light came on. It was diagnosed as "replace air/fuel sensor b1 s1. " failure caused excessive damage because the sensor fused into the rear exhaust manifold. Diagnostic testing $ 49. 00 sensor replacement part 227. 52 " " labor 150. 00 rear exhaust manifold 154. 21 rear exhaust manifold gasket 29. 27 repair was not done at a Toyota dealership. I am reporting this so that Toyota will change the design. Failed part should not damage surrounding structures. Suggest recall on this part if Toyota continues to use this design.

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car image   Engine Cooling System problem of the 2005 Toyota Sienna 19
Failure Date: 05/26/2005

The contact owns a 2005 Toyota Sienna. The contact stated that the check engine and battery warning lamp was illuminated. He also stated that the engine temperature rose and caused the vehicle to overheat. The vehicle was taken to the dealer who diagnosed that the air conditioner compressor was defective and needed to be replace yet the remedy failed to repair the problem. The manufacturer was made aware of the failure who did not offer any assistance becuase the vehicle was repaired four times prior under factory warranty. The vehicle was not further repaired. The failure mileage was 10,834 and the current mileage was 83,113. Updated 07/20/lj.

car image   Engine Cooling System problem of the 2004 Toyota Sienna 20
Failure Date: 12/25/2004

I bought a 2004 Toyota Sienna ce in ottawa, ontario, canada, from a dealer, new, off the lot in August 2004. By the first winter, both back sliding doors would freeze shut, especially the passenger side, and would not open until the vehicle got really hot inside. The dealer had no solution, offered no solution. In addition, by the second year we had three radiators installed, and had both front doors repaired for rusting under a general recall. Also, the rear fan has been going on and off, even with the switch in the "off" position. We have taken this issue to the dealer many times, but they do not have an answer, nor a strategy to figure out why it does this. Finally, this vehicle has rattled inside from day one and is unpleasant to drive. I find the Toyota dealers not interested in you once you buy the car, but after three years to the day the called me wanting to know if I'd buy a new one. I will not buy another Toyota.

car image   Engine Cooling System problem of the 2000 Toyota Sienna 21
Failure Date: 05/13/2003

I own a 2000 Toyota Sienna le. I noticed a coolant leak. I took it in to a Toyota dealer and discovered the problem was the leak from the cooling pipe. The cause of the problem was the cooling pipe was rubbing against the power steering line (according to the service advisor) and the cooling pipe wore out. I asked if it was a design flaw. He replied that he never saw this before, but there should be something between the cooling pipe and the power steering line to prevent the rubbing. This fix is $410 for parts and labor and is not cover under the extended warranty since it is a pipe that broke. I feel like this is a design flaw by Toyota.

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car image   Engine Cooling System problem of the 2000 Toyota Sienna 22
Failure Date: 03/29/2000

I took my new van 6 times to 2 dealers to get the problem fixed but they could not. I filed a case with Toyota's arbitration program ncds (case#1200092) declaring my vehicle as a lemon and asking Toyota to repurchase the vehicle. Ncds denied my request on absurd grounds. Toyota claimed in defense that the vehicle is safe to drive contradicting the owner's mannual itself. The manual warns owner not to drive the vehicle under the conditions my vehicle was in to prevent personal injury and damage to the vehicle. After getting frustrated with ncds and my new $30,000 van out of service for more than 3 months, I finally had a third dealer fix the problem. American consumers do not have to compromise safety and undergo such a pain for manufacturer's or dealers' mistakes. No safety defect listed in summary.


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