2004 Toyota Sienna XLE...overheat problem....replaced water pump, thermostat and flushed fluids and added new. Now the temp gage while driving moves up from half on the indicator to 3/4 and the air conditioner blows cool air not cold. It eventually moves back to half and air goes cold. How does this cooling system work,

SOURCE: Adding daytime running lights to a 2008 Toyota Sienna

http://www.siennaclub.org/forum/index.php?showtopic=3772

DRL's can be added simply by adding a 20 amp fuse into an empty slot in the fuse box.

SOURCE: VSC and engine light on

The Trac light comes on automatically, in conjuction with the Check Engine Light. You need your vehicle scanned for DTC codes.

Mike Vincent

• 358 Answers
• Posted on Jun 16, 2009

SOURCE: 2004 toyota sienna a/c not working one side cold other side warm

there are two a/c lines that run down the fire wall under the van to the rear.right around the bottom of the fire wall the is a connection point on both lines. you will find a leak there .replace the orings and recharge system. also you will need two specail toyota tools to release the couplings.i have done this repair on several sienna's. let me know if this helps.

SOURCE: 1990 toyota pickup 22re engine runs hotter with ac on

I would bet that your fan is not coming on. When an airconditioner is on it uses alot of power and that makes heat. The engine will warm past the safe point. Most vehicles should have a switch that turns the fan on and off to cool the motor. You can start the vehicle and pop the hood. once it gets warm if you don't see the fan come on that's most likely your problem. Be very careful around the blade because they come on and off suddenly. I go to Auto Zone for free diagnostics. They only sell parts but can walk you thru possibly fixing it yourself.

SOURCE: 2005 Toyota Sienna XLE - Automatic sliding door not closing.

This may or may not work depending on exactly what is wrong with the door, I cant tell what is wrong without looking at it directly however:
You can try starting with all doors closed and unlocked, keys in hand disconnecting the battery and letting the vehicle sit for 2 min or so, then reconnect the battery. Put the key into the ignition and turn it to the on position but do not start the van. Next press the button to disable the power sliding door for the drivers side, then manually open the door fully, wait 5 seconds, then close it manually fully. Press button the button again to re-enable the power sliding door, then try to use it with the automatic feature either by pulling the handle or using your remote, this may or may not work depending on if the door has somehow become de-initialized (it should work now) however if something is broken inside the door closing mechanism or door closed/open sensors, the door will continue to malfunction.