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Discussion Starter · #1 ·
I read that the sight glass should be clear of bubbles when the AC is running. Any bubbles may indicate the system is low on freon. I noticed there is always bubbles on mine, but the AC works well and cold.

I'm curious if your IQ's AC is the same way? Thanks.
 

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2014 Scion iQ
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837 Posts
Hello. Last DMV renewal I missed it somehow and by the time I was trying very high penalty and late fee. So I PNO'd it. My son recently got his DL and has basically taken the 2nd vehicle so I should renew it soon.

That said there is a neat inspection chart that I found in my repair info:

Engine @ 1500 rpm
Blower HI
A/C ON
Temp @ MAX COLD
All doors fully open (I assume this means trunk also)

1. Bubbles visible Insufficient 1) check for leak and repair if found 2) add freon until bubbles disappear

2. No bubbles Empty, Insufficient, or Excessive See 3 and 4

3. No temp difference between compressor inlet and outlet Empty or nearly 1) check for leak with halogen leak detector and repair if found 2) add freon until bubbles disappear

4. Considerable temp difference compressor inlet and outlet Correct amount or excessive See 5 and 6

5. Immediately after A/C OFF, refrigerant clear Excessive 1) Drain or discharge 2) Pull vacuum and charge pure freon

6. Immediately after A/C OFF, refrigerant foams and then clear Correct

*IF ambient higher than usual but cooling sufficient, bubbles permissible

Hope this helps...
 

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Registered
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223 Posts
Discussion Starter · #3 ·
Hello. Last DMV renewal I missed it somehow and by the time I was trying very high penalty and late fee. So I PNO'd it. My son recently got his DL and has basically taken the 2nd vehicle so I should renew it soon.

That said there is a neat inspection chart that I found in my repair info:

Engine @ 1500 rpm
Blower HI
A/C ON
Temp @ MAX COLD
All doors fully open (I assume this means trunk also)

1. Bubbles visible Insufficient 1) check for leak and repair if found 2) add freon until bubbles disappear

2. No bubbles Empty, Insufficient, or Excessive See 3 and 4

3. No temp difference between compressor inlet and outlet Empty or nearly 1) check for leak with halogen leak detector and repair if found 2) add freon until bubbles disappear

4. Considerable temp difference compressor inlet and outlet Correct amount or excessive See 5 and 6

5. Immediately after A/C OFF, refrigerant clear Excessive 1) Drain or discharge 2) Pull vacuum and charge pure freon

6. Immediately after A/C OFF, refrigerant foams and then clear Correct

*IF ambient higher than usual but cooling sufficient, bubbles permissible

Hope this helps...
Sorry about the registration penalty. I missed it once also and paid the penalty.

Thanks for the info regarding the AC. I recalled see the bubbles in another IQ and mine always has the bubbles and the AC is quite cold for years.

I was wondering if your IQ has bubbles and blowing cold as well?
 

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Super Moderator
2014 Scion iQ
Joined
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837 Posts
Sorry about the registration penalty. I missed it once also and paid the penalty.

Thanks for the info regarding the AC. I recalled see the bubbles in another IQ and mine always has the bubbles and the AC is quite cold for years.

I was wondering if your IQ has bubbles and blowing cold as well?
I haven't driven it since. But that test sequence is straight from Toyota TIS, reworded as best I could to avoid Copyright issues...

I actually carefully raised the front end on Rhino Ramps and any day it is ready for me to start rear drum to disc conversion.

Sent from my REVVL V+ 5G using Tapatalk
 

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223 Posts
Discussion Starter · #5 ·
thanks again for your help. hope your brake conversion project will go well.

I haven't driven it since. But that test sequence is straight from Toyota TIS, reworded as best I could to avoid Copyright issues...

I actually carefully raised the front end on Rhino Ramps and any day it is ready for me to start rear drum to disc conversion.

Sent from my REVVL V+ 5G using Tapatalk
 
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