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A/C works intermittently

Tiny
LEWIS2019
  • MEMBER
  • 2001 TOYOTA SIENNA
  • 166,500 MILES
My A/C in my van works sometimes. One minute it is very cold then gets hot. When I turn the off the idle decreases, when I turn the A/C on, the idle changes but no A/C. The back cool but the front is blowing hot air sometimes.
Monday, May 20th, 2019 AT 10:41 PM

24 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Do you have gauges that can give me the high and low side of the AC system while it is running?

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

When you command heat and cold in the front, do you hear the mode door move?

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

This could be a Freon issue or it could be a blend door issue.

Roy

INSPECTION

1. REMOVE LOWER FINISH PANEL
2. REMOVE NO.1 SAFETY PAD INSERT
3. REMOVE CLUSTER FINISH PANEL
4. REMOVE CENTER CLUSTER FINISH PANEL
5. REMOVE RADIO RECEIVER

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6. REMOVE AIR MIX SERVOMOTOR
a. Disconnect the wire harness clamp.
b. Disconnect the connector.
c. Remove the 3 screws and air mix servomotor.

7. INSPECT AIR MIX SERVOMOTOR CIRCUIT
8. INSPECT AIR MIX DAMPER POSITION SENSOR CIRCUIT

9. INSTALL AIR MIX SERVOMOTOR
a. Install the air mix servomotor with 3 screws
b. Connect the connector.
c. Connect the wire harness clamp.

10. INSTALL RADIO RECEIVER
11. INSTALL CENTER CLUSTER FINISH PANEL
12. INSTALL CLUSTER FINISH PANEL
13. INSTALL NO.1 SAFETY PAD INSERT
14. INSTALL LOWER FINISH PANEL
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Tuesday, May 21st, 2019 AT 2:53 AM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
Thanks for responding. Yes, I have a gauge. This morning I switched it from hot to cold slowly and it started to get cold again.
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Tuesday, May 21st, 2019 AT 5:14 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, what were the high and low side readings?

Roy
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Tuesday, May 21st, 2019 AT 6:46 AM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
I only checked the low side it was in yellow.
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Tuesday, May 21st, 2019 AT 7:13 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I need numbers. Can you give me the actual pressure? It is important.

Roy
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Tuesday, May 21st, 2019 AT 7:22 AM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
Okay, I will do so when I leave work.
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Tuesday, May 21st, 2019 AT 7:34 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sounds like a plan.

Roy
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Tuesday, May 21st, 2019 AT 8:13 AM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
Thanks.
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Tuesday, May 21st, 2019 AT 8:24 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Tuesday, May 21st, 2019 AT 8:30 AM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
I am at my car now.
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Tuesday, May 21st, 2019 AT 3:54 PM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
I just tested the low line and that is reading I am getting.
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Tuesday, May 21st, 2019 AT 3:57 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, what is the outside temperature?

Roy
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Tuesday, May 21st, 2019 AT 4:10 PM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
Outside temperature is 83 degrees.
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Tuesday, May 21st, 2019 AT 4:12 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, there is enough pressure for the A/C to come on.

Start the engine, turn on the A/C and tell me if the pressure changes.

Roy
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Tuesday, May 21st, 2019 AT 4:15 PM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
I started it but the A/C doesn't come on.
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Tuesday, May 21st, 2019 AT 4:19 PM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
When I just came to the car today the A/C was cold but after a few minutes it got hot.
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Tuesday, May 21st, 2019 AT 4:19 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, and the gauge reading when it was cold and when it got warm?

Roy
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Tuesday, May 21st, 2019 AT 4:25 PM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
When it was cold it was 55 in the yellow.
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Tuesday, May 21st, 2019 AT 4:28 PM
Tiny
LEWIS2019
  • MEMBER
  • 13 POSTS
When the A/C gets hot the reading is red.
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Tuesday, May 21st, 2019 AT 4:28 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, thanks. This sounds like it is overcharged.

How much Freon was installed in the system? The low pressure is too high and I need to see the high side as well.

Roy
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Tuesday, May 21st, 2019 AT 4:32 PM

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