Manifold readings

Tiny
RUDYPAK
  • MEMBER
  • 2005 TOYOTA SIENNA
  • 3.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 222,000 MILES
I am confused. I have had 2 different answers for my gauge readings. One said they were perfect and sent me a chart. Another said they were a bit high and that my low side should be closer to 30 and my system was over charged.
Let me give the scenario when I took the readings. Side of a building in direct sunlight, no wind, cabin temp reading about 90+ but over the engine it feels way hotter.

Based on my picture and ambient temperature 90 Fahrenheit is my low side 42 using the black number or is it 48 in the blue scale that looks to be marked at the beginning of the blue "r134a"?
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Tuesday, August 4th, 2020 AT 3:54 AM

4 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning again.

The black number is the one you use.

That is too high as I have stated before. The low side with a proper operating expansion valve should be 25-30 pounds. 42 is pushing the Freon through much too quickly and will not absorb the heat as designed.

The high side should be 2 times ambient temperature plus 15%. Your high side is a little high but not bad. As you drive it and more air comes through the condenser, it will come down.

You still need to replace the expansion valve as I have stated in your previous posts.

Roy
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Tuesday, August 4th, 2020 AT 5:08 AM
Tiny
ASEMASTER6371
  • EXPERT
Did you respond? I got an e mail but nothing came through.

Roy
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Tuesday, August 4th, 2020 AT 7:45 AM
Tiny
RUDYPAK
  • MEMBER
This is the 3rd time I am sending a message. Don't know what's going on.
I appreciate your time and patience. The information you so generously sent has saved me time and money.
The van is our primary source of transportation and with 2 small children it helps having A/C on humid rainy days.
This has inspired me to learn more in depth the entire A/C system.
Thank you again and I will follow up on the expansion valve.
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Tuesday, August 4th, 2020 AT 9:29 AM
Tiny
ASEMASTER6371
  • EXPERT
You are welcome.

Always glad to help.

Roy
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Tuesday, August 4th, 2020 AT 9:34 AM

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