no heat on passenger side

[riccardol2]

i have a 05 corolla s and pasennger side is blowing cold air out of all the vents i need some help

[Bitter]

check the coolant level, could be low.

[mikered30]

Does the drivers side blow hot air? Is there any air flow from the passengers side?

[tarbasd]

If the drivers side blows hot air, it is probably a problem with the vent doors that select the air source. They are probably operated by vacuum. (I never had to take it apart on this car.)

[riccardol2]

yea the drivers side blows hot air... and all the vents on the passenger blow cold... the coolent levels are normal and it wouldnt happen tol be the thermostat because theres heat working right? and does abyone know to to take the dash board apart? this is gonna suck

[maxjpower]

i have o5 matrix with the same problem
i took radio out to take a look , does not look good behind radio it splits left and right but could not get it off because screw goes other way as all stuff was mounted from other side before dash was installed
am at loss everything but heat on that side
two hoes go from radiator to firewall is there two different boxes in the dash??
thanks

[highpsi4]

First question, does the car have seperate driver/passenger heat control? if not there should be a metal arm that operates the blend flap (this flap is at the heater core). This is the control on the pass. side. On some car designs if the flap is stuck in the middle then one side gets hot air off the core the other side gets cooler air from inside the cabin. Can you still use the blend option? What happens? I have not taken one of these out but I have worked on others.

[maxjpower]

no separate driver pass controls
where is this flap of which you speak?
the blend from hot to cold works fine on driver side and cold to cold on pass side
to get heat over there i have to have the recycle button on and eventually it blows the already warmed air

[highpsi4]

Well, I have the heater/AC diagram in a PDF but I do not know how to get it on the site. If your blend function is still working on the driver side then you have the pass side blocked or the duct has come loose. Does the car have the rear duct? Will it work correctly?

[maxjpower]

does not have rear heat

[wrenchman626]

My son has this same problem on his 05 XRS in Texas. He says the passenger side blows cold both vent and defrost. My Haynes manual is no help and I'm in VA. Are these doors cable, electric or vacum? If you could find a link that could show the set up it would be great. It just started acting up on his move to TX in Jan.

Dave
05 XRS
95 Corolla
01 Camry

[TerryWalter]

I had the same problem on wifes car. I went to Harbor Freight and bought a Laser Thermometer. I then went to measure the hoses going into and out of the heater core. Next I measures the actual pipes under the dash on the drives side that go into and come out of the heater core. Last I drilled about 1/2" hole on the passenger side next to the Heater core and then I could take a measurement of how hot the heater core was. In all the heater core was at about 57 degrees and the pipes going into and out of the heater core was at about 90 deg for one and 80 deg for the other. The temp for the actual heater hoses located coming from the engine measured 150 deg and 130 deg. From this I knew the heater core was plugged.

I bought a pump used on a drill and some old garden hose along with 5 gal bucket and some kind of strainer. I hooked this up in place of the heater hoses going into the fire wall and circulated about 3 gallons of hot water mixed with CLR for about 20 minutes in all. I did switch the hoses so I backflushed and forward flushed the heater core. I really didn't see much crude but afterward my new measurements increased.

The heater core now was at about 152 degrees and the pipes going into and out of the heater core was at about 130 deg for one and 96 deg for the other. The temp for the actual heater hoses located coming from the engine measured 160 deg and 120 deg.

I believe that I have better heat than when we bought it new. Let me know if this helps anyone or if you have more questions.

Terry

[wrenchman626]

Thanks Terry, I wasn't thinking along the lines of a clog heater core. But I know this car hasn't had any coolant system flushing done since it was new. Its due for it anyway. I'll pass the info along to him in San Antonio.
Dave in VA.