Last post on Jul 25, 2013 at 4:08 AM
You are in the Toyota Sienna
What is this discussion about?
Toyota Sienna, Heating / Cooling, Van
#173 of 182 Re: 2003 Siena XLE [arprince]
Apr 19, 2012 (6:43 pm)
Clearly, you have a leak somewhere that needs to be properly diagnosed and fixed! Either get the stuff with the florescent dye and get a blacklight, or take it to a shop that has a electronic leak detector.
#174 of 182 Re: Dirver Side not blow cold, but Passenger side is! [dfinn]
May 21, 2012 (9:05 am)
I have this same problem in my 04 sienna. wondering if you ever found a solution?
#175 of 182 A/C quit working all of a sudden
Jul 07, 2012 (11:46 am)
I have a 04 Toyota Sienna LE AWD and had the ac stop working. It had been working fine the day before and even earlier in the day, but now it just blows hot. I doubted it was the problem but to make sure bought some refrigerant to add to the system and it almost seemed like the low pressure side was not low pressure as none of the refrigerant would go in. But maybe it was just that it didn't need any at all. What should I do to test and find/confirm the problem?
#176 of 182 2001 Toyota Sienna XLE Front A/C Auto Temperature control problem
Jul 10, 2012 (6:07 pm)
We have a 2001 Toyota Sienna XLE which is having A/C problems. Intermittently it is not blowing cold air in the front. The rear A/C is able to consistently blow cold air. Checking the inspection port on the drier shows bubbles moving when the compressor kicks in. I would not be surprised if it could use a little refrigerant given the age of the vehicle but the system is blowing consistently cold air in the rear.
When the A/C seemed to stop working we have found if you raise the temperature in the front to max heat and then adjust it back down to cool it seems to get stuck on heating. Conversely if you go to max cool you can usually get it to switch to cool even when raising back to 74 degrees.
There is a ticking noise directly behind the center vents (where I assume the mixer box is) that will stop if you go to max heat or cold but seems to continue if you leave it at around 74 degrees.
Any help with additional trouble shooting steps would be appreciated.
#177 of 182 Re: 2001 Toyota Sienna XLE Front A/C Auto Temperature control problem [b1tbuck3t]
Jul 11, 2012 (12:10 pm)
A constant ticking sounds like a failure of the air mix solenoid assembly. A solenoid is a motor with positional feedback, so the clicking is likely from stripped gears as a result of the motor trying to fight a stuck blend door.
Edit: Sorry - got side tracked and didn't finish the thought.... So, you'll need to work up from under the dash to locate the solenoid, and replace it. But as important, check out the mix door movement to ensure it moves easily. Binding or lack of lubrication will only kill another motor assembly.
#178 of 182 2013 sienna se heating problem
Nov 27, 2012 (11:14 am)
traveling back from florida trip with 50 degree oat
we had trouble getting heat to driver's side unless set to
"max heat". seems intermittent at best.
due for first service, do I have legit complaint? thread seems to
point to repeating problem
#179 of 182 Re: Heater only heats when moving [doelke]
Dec 02, 2012 (8:08 pm)
#180 of 182 Re: Dirver Side not blow cold, but Passenger side is! [erin602]
Jul 16, 2013 (9:11 am)
How have things gone since you did this?. I have passengers side blowing cold but driver's side blowing warm. This sounds great if it works but doesn't cause other issues
#181 of 182 Re: Dirver Side not blow cold, but Passenger side is! [prowl66]
Jul 24, 2013 (5:05 pm)
at about the same time these two things started to happen, not sure if they are connected...Fan Speed Switch for Heater/AC only turns the fan onto high when in the high spot, no other spots make the fan work. Same week the car over heated while parked with the engine on and AC on. Only took 10 min and his done it twice.
Coolant levels are fine and no leaks have been found
But when my wife got home yesterday, while the car was warm I noticed the left side (drivers side) cooling fan on the radiator was not turning, but when I turned on the AC it would still not come on, BUT as soon as I turned the fan speed switch to off the fan would come on for a brief second and then turn off not to come back on. Any ideas?
#182 of 182 Re: Dirver Side not blow cold, but Passenger side is! [gsbloss]
Jul 25, 2013 (4:08 am)
There is a fan control logic module behind the radiator between the fans on a post (IIRC). That gets temperature data, plus settings info from the AC Amplifier (dash control panel) and outputs to the fans. While it could be a bad fan motor, most likely one of these electronic units isn't telling the fans they need to be running.
The dash gauge on most cars is really dumbed down, and the needle will hang in about the same spot when the engine is from around 170-215' F. You need to be plugged into the OBD port to really see what the coolant temp is. So likely the temps are climbing, but you don't get a real indication that things are going bad until just before the coolant boils at 235' F.
The interior fan speed switch also interfaces with the AC Amp, so perhaps it's pointing to that module as well. It's going to take some professional diagnostics to figure this out. The blower motor speed control also relies on a blower resistor module that is located within the interior air stream to keep it cool. I once had an overheating engine that blew such hot air into the interior that it cooked this module and melted the solder on the individual resistors! The result is a single high speed, and the open ckts at the other spots will be off - exactly as you described. So perhaps the events are connected. After addressing the overheating, I (being cheap) simply resoldered the resistors back in place and the module lasted the life of the car.