Heater Blowing Cold Air!

[geoweb2k14]

Hi guys, I swear if I have any more trouble with my d4d avensis I'm gona burn it. Can anyone shed some light my queary. My heater in the car is blowing cold air only. Could this be a stat or censor problem. All help much appreciated....

George.

[avensisd4d786]

does it overheat? if yes probably stat stuck closed.

[geoweb2k14]

No, the car temp guage is working fine and not overheating. The car heater is just blowing cold air.

[nuksoocow]

No, the car temp guage is working fine and not overheating. The car heater is just blowing cold air.

[nuksoocow]

Having similar problem mine only blows hot air on passenger side vents and cold on mine plus AC not working I was told it was the heater mode adjuster but I'm not sure was also quoted 250 including parts and labour anyone any advice for geoweb2k14 and I please

[mattos10]

I had a similar problem with my previous Avensis.

It turned out to be due to low coolant level.

Sent from my iPhone using Toyota OC

[nuksoocow]

I have just got mine serviced so I can't see the coolant level being a problem but I will check to be sure tnx for info

[geoweb2k14]

Topped up my coolant nuksoocow as it was low and heater is working fine now...

[nuksoocow]

Really no way I'll check mine ASAP cheers

[ejabrod]

Topped up my coolant nuksoocow as it was low and heater is working fine now...

Glad you got sorted Geo

[nuksoocow]

Ok so my coolant is topped up from my service last week so it's not that I am bringing it back to my mechanic on Monday so I will know more then

[Exvec]

To my mind something is happening with the servo motors which alter the settings when you turn the heater control knob.

[nuksoocow]

Hi Exvec

your right that was my problem here is a link that might help someone in the future

disconnected mine and reconnected it after a fen days and it's working for now, heat again :) thanks for the info appreciate it

http://www.toyotanation.com/forum/270-4th-generation-2003-2009/358541-grinding-clicking-under-dash-air-mix-servo.html#/forumsite/20543/topics/358541

[Exvec]

Hi Exvec

your right that was my problem here is a link that might help someone in the future

disconnected mine and reconnected it after a fen days and it's working for now, heat again :) thanks for the info appreciate it

http://www.toyotanation.com/forum/270-4th-generation-2003-2009/358541-grinding-clicking-under-dash-air-mix-servo.html#/forumsite/20543/topics/358541

Ok glad you have it sorted mate.

[geoweb2k14]

Mine is gone again guys so the coolant top up fix was just a coincidence.. Nuksoocow where exactly will I find the servo motor on my avensis?? Cheers

[nuksoocow]

Hi again mine is a 07 avensis it was located under driver side of the dash beside the back of the heater, pull back the carpet a bit where it tucks under the plastic

you will see it as it has a white lever turn your heat up and down and this lever should move if not that's your problem mine wasn't working on the driver side but if yours isn't working at all it could be another problem mine has dual control so this is a common problem let me know if this helps

[geoweb2k14]

Thanks for that, I'll try it and keep you informed of the outcome.

[ken s]

The passenger side one can be accessed easily enough by removing the glovebox, if that side needs looking at.

[geoweb2k14]

Both sides don't work ken .....

[ejabrod]

Did you get a resolution to this GEO?

Today, my heater started to blow cold air.

Was in the car, had the temp set to the red dot, changed the output to the 'face' setting and over 4 or 5 minutes the air went from being really warm to being cool!

So the options are:

1) Coolant

2) Thermostat

3) Servo motors

Any other suggestions?

this car is starting to rightly píss me off

[geoweb2k14]

No eja I didn't. Changed and flushed out coolant pipes and also put in new thermostat but still same. Both pipes going into car from engine do be hot but it still blows cold air inside. I've been told the heating matrix may be gone but don't ask me where that is as I haven't a clue.... Now my turbo sensor is gone!! I'm cracking up now. I think toyota may change their quote " Best built cars in the world" to " pot luck if you get a faultless one",,,,, lol

[ejabrod]

Thanks for the reply Geo.

I was just back from getting supplies to service the car when this happened.

AFAIK the heater matrix is located on the passenger side behind the glove box to the right.

I will replace the thermostat first, if that doesn't work I will top up the coolant and if that doesn't work I will look into the heater matrix

[ejabrod]

Quick follow-up.

Was back out in the car and the same thing, cold air when turned to red dot. Noticed when driving at normal speed 2.5k revs the aire was hot but when I stopped at lights the revs to 800 cold air started to come out???

Revved to 1200 and the air got hot again!!!!

Anyone know what might cause this?

I have a new thermostat ready to go

[geoweb2k14]

Mine done that too eja but I thought I was imagining things, hope someone has an answer to this.

[ejabrod]

Thanks GEO.

I'll go ahead with the items above anyways and see what happens.

It is strange that the temp increases if the car is revved.