A/C gauges readings

Tiny
VICTORMAPONTE
  • MEMBER
  • 2008 VOLKSWAGEN JETTA
  • 2.5L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I just replaced the A/C compressor switch and recharged the system. My reading on the low side is 45 and on the high side are in between 300-410.
Saturday, August 7th, 2021 AT 9:53 AM

2 Replies

Tiny
VICTORMAPONTE
  • MEMBER
  • 2 POSTS
  • 2008 VOLKSWAGEN JETTA
  • 2.5L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I checked again the reading on my gauges and with the Ambient Temperature 100. The reading were as follow
L45-50 and H-300-350 with inside of car temperature to 60 degrees. Do I have to change the Expansion Valve?
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Saturday, August 7th, 2021 AT 7:17 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Nope. Looks like that is about right. If you have 100 degree ambient temperature and getting 60 degree inside temperature, then that is working really well especially for vehicle that is almost 15 years old.

These are some guides that talk a little about this:

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

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

However, I think the chart below explains everything you need. Clearly these numbers do not need to be exact but you are pretty close to the 100 degree marks.

The only thing I would do is keep an eye on the inside temp. If it starts to get much above a 45 degree spread from ambient to inside duct temperature then you are starting to get an issue.

So according to the chart, you are just under the low spec and just above the high spec and that would indicate a blockage.

So you may be right that you have the start of one but at this point, I would not make a repair because even if you do, I would not expect you to gain much cooling power. Meaning at 100 degrees, you are not going to get much better then 60. Maybe get it to high 50s but to me, that would not be worth it. However, if in the next couple weeks, that spread of ambient to duct temperature gets smaller then you do have to take action.

Let me know if you have questions on this.
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Sunday, August 8th, 2021 AT 3:41 PM

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