Defrost not working

It sounds like you have a mode door actuator that is not working here is a guide that will help you.

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Please let us know what you find so it will help others.

Best, Ken

That would be a issue with the mode door actuator.

hi again. would you be able to tell me what part # i would need for the Blend door actuator for my 09 Corolla?

Sure I found one right here on Amazon for $191.00

https://www.amazon.com/gp/product/B01BDWOCVQ/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=2carprcom-20&creative=9325&linkCode=as2&creativeASIN=B01BDWOCVQ&linkId=f8dea4553ab85fe4dafe7bdce69eaac0

Let me know how it turns out.

Best, Ken

that part does not fit my vehicle according to the fitment chart. Also another link you sent me how to change the actuator is a much smaller part.

this is from the link sent to me?

Look under the dash in the middle for a cable going to a mode door.Then operate the mode door knob while watching it.It doesn't just a OT about the AC on that car on our repair information we use.But looks like it might be cable operated.

sorry but in layman's terms? OT? please explain. thank you

That was a type O I was trying to just say it doesn't give much information on the AC of your car in the repair information we use on this site.

ok. lol I've taken it to a garage.. thanks for all your help.!!

Keep us posted on what they find so we can help other users.

I will, thank you

Hey,

Did you ever get the problem fixed?

Best, Ken

yes and no, the mechanic couldnt find the actuator, however they did switch the heater manually so that at least I have defrost on the windows until they can find where the actuator actually is located.

Hey LJCALLES,

I found this location diagram for you maybe you can print it and give it to the garage so they can see where the actuator is.


Best, Ken

thank you, I will print it out for them.

what part number do you think it may be?

That I don't have, you would have to call the dealer and ask them.

Hello,
I have a 1999 Toyota Corolla 4 cylinder 3 speed auto transmission with around 112,000 miles.
This thing will run you out in zero weather when you use dash or floor or combination. As soon as you turn it to defrost, it kicks the AC on ( I know this is normal in order to remove moisture from the cab) the thing will start blowing cold air out vents. Turn it back to dash or floor and it will take 3 min to become hot again. I replaced the thermostat and flushed the cooling system to ensure it is good. I ran the engine to get it to cycle the engine fan and it cycles fine and coolant apears to be circulating fine. I touched both inlet and outlet to heater core and they are hot to the point you cant hold them very long.
Im not sure what to check next. Is there a ambient temp sensor that senses outside air in order to control the AC on heat? Anyone have any ideas?
Thanks in advance.

You need to get under the dash and check the operation of the blend door, it may be binding...this balances the hot and cold air entering the car.

[quote:6c2af08020="merlin2021"]You need to get under the dash and check the operation of the blend door, it may be binding...this balances the hot and cold air entering the car.[/quote:6c2af08020]
Thanks for the reply, I have the complete dash out and everything appears to be working and opening and closing as it is supposed to. Not sure what to look for next.

Look far a leaking servo, tht's the vacuum motor. does any of them reopen after they have moved? It sounded like you said it took 2-3 minutes, then the cold set in? Also when it turns cold check the water inlet to see if it has cooled...if there is a valve in the waterline it may be closing the water flow off!

Here are some test proceedures to follow!

Thanks for your quick response, I will check the things you have suggested and go from there.

I have to borrow a volt meater but I don't see any inline valves or none of the servos seem to be moving once they are in position. Something new today. Well my son informed me this morning that his car is not getting very warm going down the road. So it appears that as you go down the road it is cooling off and he stated the heater gauge remained in the same location. So now after I have flushed and replaced the thermostat and coolant it has gotten worse even off of defrost.

My Front Window Defroster doesn't work and my car doesn't make heat. I took it to the mechanic and they indicated that the heater core went bad. They offered up a solution of bypassing the heater core so that the car wouldn't overheat and they also said that since the Heater Core is bad, my Toyota Corolla heater and front window defroster will not work.

In order to fix this problem, I have received a $1000 repair bill estimate. The mechanic explained to me that the entire dashboard needs to be removed since Toyota built the car by placing the heater core under the dash board. (smart move).

They also said that the $1000 pricetag is mainly for the labor, which is estimated at taking 8.1 hours to complete.

Is there a way to purchase a new heater core, and mount it inside the engine compartment my self, in order to get the heat and front defroster working again?

Toyota Owner Anthony,

See if you can disconnect the heater hoses at the core inlet, then make an adapter for your garden hose with the flush kit, hook it up to the core and flush it real good, both ways! Heater cores are not built like radiators, they are a honeycomb type flow.

All heater cores are a pain in the rear to get to, not just Toyota's.

With engine at temp and heater core connected, quickly touch the top heater core hose and then the bottom one, if both are hot, then heater core is not the problem, if one is hot and the other is warm/cold, then heater core is blocked.

See if mechanic can remove the hoses and flush the heater core, removing whatever is clogging it.

But, yes, you have to remove a good portion of dash to get to core, and this is true of most cars.

As long as you flush and refill cooling system every 2 years, heater core will last a long time.

Trying to bypass the system, and mount an external heater core would be time consuming and dangerous, because you would have to run coolant lines into cabin, this is very dangerous. If they were to burst, everyone in car could receive severe burns.

If you want to save some money, use car repair manual link in this thread or get a Haynes manual and do it yourself.
After reading manual, go to local "pick and pull" yard, find a Corolla or Geo Prizm of same year and "practice" on it.

Looks like I found my problem. Now I cant decide if I should change the radiator in order to keep the trash out of the new core? Holy smokes $200.00 and no one keeps it in stock.

You can take the radiator to s radiator shop and have them boil it clean...won't cost as much as a new one...