Air conditioning blowing hot

SANDYJAMES

MEMBER
2000 TOYOTA SIENNA
3.0L
V6
2WD
AUTOMATIC
146,123 MILES

I have charged the system. When I turn the system on the compressor turns. The fan also comes on. The light on the dash comes on. But it blow warm air. What is next?

Monday, August 3rd, 2020 AT 2:37 PM

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening,

Can you give me the high and low side pressures of the system so I can see if the freon pressures are correct?

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

How much did you add?

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

When you switch from cold to hot and back, do you hear the mode door move in the dash?

https://www.2carpros.com/articles/replace-blend-door-motor

Roy

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Monday, August 3rd, 2020 AT 4:06 PM

SANDYJAMES

MEMBER
3 POSTS

I don't have a gauge for the low and high sides. I put a large can in. I tried to put a small can also but the gauge showed it in the high green area and no more came out of the can. When I switch the temperature from hot to cold I don't hear a door. But the air sound is quicker on warm then on cold.

Was this

answer

helpful?

Yes

No

Monday, August 3rd, 2020 AT 4:24 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Okay, I would get a set of gauges. You can rent a set at a part store for the check. I need those readings to be sure the system is working.

I attached the test for the air mix door under the dash for you as well in case the motor is not closing off the heater core.

Roy

INSPECTION

1. REMOVE FRONT SEATS
2. REMOVE FRONT DOOR SCUFF PLATES
3. REMOVE COWL SIDE TRIMS
4. REMOVE REAR DOOR SCUFF PLATES
5. REMOVE LOWER CENTER PILLAR GARNISHES

imageOpen In New TabZoom/Print

6. REMOVE AIR MIX SERVOMOTOR
a. Slide the floor carpet backward.
B. Disconnect the connector.
C. Remove the 2 screws and servomotor.

7. INSPECT SERVOMOTOR OPERATION

imageOpen In New TabZoom/Print

a. Connect the positive (+) lead from the battery to terminal 2 and negative (-) lead to terminal 1, then check that the arm turns to "COOL" side smoothly.
If operation is not as specified, replace the servomotor.

ImageOpen In New TabZoom/Print

b. Connect the positive (+) lead from the battery to terminal 1 and negative (-) lead to terminal 2, then check that the arm turns to "WARM" side smoothly.
If operation is not as specified, replace the servomotor.

ImageOpen In New TabZoom/Print

8. INSPECT POSITION SENSOR RESISTANCE

Images (Click to make bigger)

Was this

answer

helpful?

Yes

No

Monday, August 3rd, 2020 AT 4:37 PM

SANDYJAMES

MEMBER
3 POSTS

Okay, got a gauge. I have 15 on the low and 135 on the high. When I tried to add another can of from the system would not take it.

Was this

answer

helpful?

Yes

No

Wednesday, August 5th, 2020 AT 3:00 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Okay, 15 pounds is your issue. The expansion valve is stuck closed not allowing Freon into the evaporator.

You need to replace the expansion valve and the dryer.

https://www.youtube.com/watch?v=GemLsZuQeWc

The expansion valve is on the end of the evaporator core under the dash. It will require removal of the heater case to access.

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

I attached a YouTube video of the location and how to get to it without removing the heater case.

https://www.youtube.com/watch?v=GemLsZuQeWc

Roy

Image (Click to make bigger)