really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
56,780 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Toyota Sienna AC / heater problems

AC / heater problem

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2004 Toyota Sienna Owner Comments

problem #6

Aug 052009


  • 87,000 miles


The ac in our 2004 Toyota Sienna went out in August (very hot!); we took it to a repair shop. Turns out the ac compressor and multiple related parts needed to be replaced due to a problem with this particular system. Called around to ensure fair price- many shops reported having had this same problem on this make and model. Had necessary repairs completed at a cost of over $1500. I was told the repair on a 2003 model was only $950 plus tax, but subsequent years had more problems and required more parts replaced because of design problems. Having ac is not only comfort, but also safety- we bought this vehicle because we have young children and they would get quite hot, sweaty, red-faced, etc. Without rear ac in our former vehicle. It seems this is a widespread problem with this make and model. I've read Toyota knew about this problem and extended the warranty for ac (although owners weren't informed, and we are past that limit anyway); however, if this is such a huge problem there should be a recall with the a preventively fix rather than waiting for owners to incur such huge bills and not have the ability to keep their families cool while they drive. This may seem mostly comfort, but for those with young children, the elderly, and other at-risk populations, ac is also very much about safety.

- Lehi, UT, USA

problem #5

Jun 012007


  • 98,000 miles
The contact owns a 2004 Toyota Sienna. While driving 40 mph, the contact depressed the brake pedal, but the vehicle did not stop. There were 30-40 yards between the contact's vehicle and the preceding vehicle. The brake pedal extended to the floorboard. The brakes grabbed momentarily, but then became "mushy." The contact crashed into the preceding vehicle and caused injuries to the occupant in the other vehicle. The passenger's seat belt did not engage properly, causing the passenger to strike the dashboard and sustain minor injuries. The vehicle was destroyed and towed from the scene. The failure and current mileages were less than 55,000.

- Congers, NY, USA

problem #4

May 152008


  • 26,000 miles
My 2004 Toyota Sienna only has 29,000 miles and the air conditioning has been hardly used. The A/C system failed working about 3 month ago duo to the condenser O-ring failure. I checked online and found that many 2004 Sienna users have the same problem.

- Tacoma, WA, USA

problem #3

Jul 082008


  • 93,000 miles


The contact owns a 2004 Toyota Sienna. While driving under 40 mph, the air conditioner failed to work properly. The air conditioner stopped working and the temperature on the thermostat continued to rise the following day. The contact checked the coolant and noticed that there was no antifreeze; therefore, she refilled the radiator. This did not keep the vehicle from overheating. She took the vehicle to a local dealer and they stated that there was a leak in the radiator core. The vehicle has not been repaired. The VIN was unknown. The failure and current mileages were 93,000.

- Washington Crossing , PA, USA

problem #2

Jun 192008


  • 36,680 miles
My 2004 Toyota Sienna xle limited's alternator belt got cut and the vehicle immediately stopped on the road and had to be taken to a Toyota dealer. The dealer says my vehicle had a "catastrophic ac failure" which caused the belt to break and says it will cost $2400 in parts and $1600 in labor. He then contacted Toyota and said that Toyota will pay for the parts. This problem seems to happen a lot on this model, I searched on the internet and could find a lot of people with the same issues and Toyota has still not done any recall on the ac unit. Since this seems to a total design flaw, I would like Toyota to pick up the full tab for this repair. Any help in this regard will be appreciated.

- Parker, CO, USA

problem #1

Jun 072004

Sienna 6-cyl

  • Automatic transmission
  • miles
2004 Toyota Sienna le -- the air generated by the A/C cycles from cool/cold to warm when the compressor stops; the air returns to cool/cold when the compressor re-engages. Dealer says this is normal; it may in fact be normal for this make and model but it is very different from any other air-conditioned vehicle I have ever owned. I have never had the air temperature vary as much during normal operation. The dealer suggested leaving the A/C set on "recirculated air", but this contradicts the instructions found in the owner's manual.

- Woodbridge, VA, USA

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