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  1. Problems, Maintenance, and Repair (Gen 2)
    Hello, just last week I noticed when I am driving. That my coolant fan is now always on. (Not while ignition is off). I don’t ever recall hearing the fan come on ever. Now it’s always on. When at a stop it will slow down. But as soon as I start driving it kicks in high. And although it wasn’t...
  2. Problems, Maintenance, and Repair (Gen 2)
    Hey all,I recently had to replace my radiator and decided to do the thermostate while i had everything out. There are two studs on the rear housing that attach to the fron t housing part. i got everything in place and started to thread the bolts on when i noticed the bolt getting easier and...
  3. Problems, Maintenance, and Repair (Gen 2)
    2004 Sienna LE FWD with 140k miles on it (original owner). My college bound son has been driving it most of the time recently We are relatively newbies as far as intricate knowledge about all components of cars and looking for some advise and guidance. Here is a chronology of events: Last...
  4. Problems, Maintenance, and Repair (Gen 2)
    I changed the thermostat as I kept getting a check engine light on with a code for thermostat stuck open. After reassembling everything and turning the car on, after a minute or two the idle speed dropped to around 400 RPMs. Hoping this would go back up I let the engine warm up with the AC on...
  5. Problems, Maintenance, and Repair (Gen 3)
    2015 Sienna SE - 102K miles and original owner. Short- Has anyone had to replace their radiator and thermostat? Long - Driving down the freeway and i get a signal on my screen saying to pull over and turn the car off due to the engine being too hot. So i exit, pullover into a gas station...
  6. Problems, Maintenance, and Repair (Gen 2)
    I am driving a 2006 XLE with 194000 miles. The following symptoms began showing this fall in order listed below. Note that all of this was preceded by a failed DRIVER SIDE TEMPERATURE CONTROL SERVO MOTOR that I tied up in the "HOT" position to accommodate colder weather. All problems listed...
  7. Problems, Maintenance, and Repair (Gen 2)
    Couple months ago I renewed the radiator with new hoses and thermostat. A coolant leak developed and I thought it might have been the hose clamps as there was pink residue at the lip of the hoses (might still be as I have not buttoned up everything yet , will report back). Close investigation...
  8. Problems, Maintenance, and Repair (Gen 2)
    Just wondering how many of you guys have experienced a failure of the 'Water Inlet Tube" on your Siennas? (Think Toyota calls this tube the "Thermostat Housing") My wife was driving the vehicle when the tube broke, spraying coolant all around engine bay and letting it overheat. This...
  9. Problems, Maintenance, and Repair (Gen 1)
    Coming up on a timing belt replacement om my sienna at 160k , should the thermostat be replaced even though it is not an issue, its seems like a bear to get to it, I'm wondering if toyota see's it as non serviceable and anyone else have dealt with this as being an issue.
  10. Problems, Maintenance, and Repair (Gen 2)
    I planed a vacation from West Palm Beach to Owego, NY.(1025 miles) At 150k miles, I had all of the proper things changed. Timing belt, plugs, complete new front end. However, I showed TWO mechanics the pink fuzz at lower hose connection, and the missing paint from the thermostat housing was...
  11. Problems, Maintenance, and Repair (Gen 2)
    i have a 04 Sienna. The van was running fine until the starter went bad. But before that in the winter it wasn't heating very well. So while I was putting in a new starter I thought I would change the thermostat. i removed everything including the starter which made it easy to remove...
  12. General Discussion (Gen 2)
    i have a 04 Sienna. The van was running fine until the starter went bad. But before that in the winter it wasn't heating very well. So while I was putting in a new starter I thought I would change the thermostat. i removed everything including the starter which made it easy to remove thermostat...
  13. Problems, Maintenance, and Repair (Gen 2)
    My new to me 2008 Sienna has 88k miles. I had the coolant, tranny and power steering fluids changed for peace of mind. I noticed now about 3-4weeks later that my reservoir tank was completely empty. Figured the system had air in it and sucked in the remaining coolant from the reservoir. So I...
  14. Problems, Maintenance, and Repair (Gen 1)
    I recently changed the thermostat and when I pulled out the old one I noticed the "jiggle Valve" (?) was not quite at the 12:00 o"clock position. It was at the 11:00 position. I noticed on someones pics that their thermostats was also at the 11. When I replace the new one I had the "jiggle "...
  15. Problems, Maintenance, and Repair (Gen 2)
    I didn't too much on this. I have a 2008 sienna CE. It seems to have a lazy or open thermostat. Take for ever to warm up, runs cold etc. Coolant level is fine and there are no leaks. Was curious if anyone has done one on the 08 ? I tried contacting a member that said they did with...
  16. Problems, Maintenance, and Repair (Gen 2)
    I replace the thermostat on my 04 Sienna last night. Real bad design Toyota! Need to remove engine cover (obviously) and the air box completely. No need to remove the starter assembly as instructed in the FSM. Remove the return radiator hose that connects to a black plastic tube that runs to the...
  17. Problems, Maintenance, and Repair (Gen 2)
    I have removed the inlet pipe exposing the thermostat. At this point i should be able to pull it out. Problem is, it wont budge. I tried with my hand and pliers. Tried pulling and twisting to no avail. Anything I'm missing to do or tricks to get it out? Followed some old links on this site to...
  18. Problems, Maintenance, and Repair (Gen 2)
    Replace thermostat on 2006 Sienna LE - jiggle pin needed! I have a 2006 Sienna LE and the thermostat requires a "jiggle valve" aka "jiggle pin". I cannot find one that has this - tried 3 stores in my area, althoiugh the one I just purchased has a very small hole that I am guessing is acting as...
  19. Problems, Maintenance, and Repair (Gen 2)
    I guess this is the first thread in the Gen 2 sub-forum on thermostat replacement ... Gen 1 procedure is documented but appears to be a bit different ... Has anyone done the DIY thermostat replacement on their Gen 2 Sienna? If so, can you share any tips and/or pics? And can you specifically...
  20. Problems & Issues
    Hello-I have an 05 Sienna and need to replace the thermostat. I'm pretty handy but could not locate the thermostat. Please help so i can get it fixed my wife needs the vehicle badly. Also approx. how long should it take me and if i were to just have a shop guy fix how much? Any ideas please...
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