really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
38,996 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 cooling system problems

cooling system problem

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2004 Toyota Sienna Owner Comments

problem #4

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 #3

Aug 112004

Sienna 6-cyl

  • Automatic transmission
  • 22,000 miles
Radiator ruptured and the engine overheated; hose replaced in steering column recall; rust protective tape recall; dvd screen replaced and the entire dvd player replaced(screen still not easily visible in middle row); passenger seat belt replaced; middle passenger seat belt failing; gasoline smell inside of car with ac on recirculation; driver's window fell inside door in snow storm and was not considered a safety issue to get a loaner vehicle even though the vehicle could not be locked; tires completely bald and leaking under 30,000 miles, dvd player must be at a high db volume and when returned to radio/cd will almost deafen you; interior lights have to be manually over ridden or will drain battery; car hesitates 1-2 seconds when trying to quickly accelerate and then lurches forward alarmingly; cruise control is not functioning; waiting to have fuel mixture sensor replaced. I was not informed of first 2 recalls until I my engine overheated. I did get the rust recall and a sticker on my sliding door informing user of danger of having middle windows open while opening the middle door could catch a head or other extremity. Toyota dealer service manager says mine is the only 04 Sienna experiencing any problems except for the recalls on the radiator; the steering hose; the rust tape; and the middle seat belt. Not so according to all I have read here. Most of the problems have occurred between 22,000 and 34,000 miles; the dvd screen always failed to lock into a good position for the middle row viewers.

- Golden, CO, USA

problem #2

Feb 232005

Sienna 6-cyl

  • Automatic transmission
  • 15,982 miles
Overheating radiator, I was told it was a product recall from Toyota, I was never notified, nor do I see the recall mentioned anywhere, I was also treated very rudely at boch Toyota in norwood MA when I complained about it.

- Hyde Park, MA, USA

problem #1

Feb 102005

Sienna 4WD 6-cyl

  • Automatic transmission
  • 25,000 miles
The vehicle overheated and caused the engine to seize while driving 45 mph. Consumer and his children were left strained for several hours before help arrived. Vehicle was towed to the dealer, who D replaced the radiator, which was covered under a recall. Consumer stated he was never notified of this recall.

- Sharon, MA, USA

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