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#1
03-02-2004, 09:43 PM
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Checked my AC via sight glass...
Today I ran my AC and checked the sight glass... I got lots of bubbles until I rev'd the engine and held it (not sure what RPM but am guessing between 2500 and 3000) there. The bubbles went away until the electric fan kicked in, once it was on the bubbles reappeared. Once the fan cycled off the bubbles went away... is this normal?
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1984 190D 2.2 Auto 220k 2001 Jeep Cherokee Sport 70K 2004 Lexus RX-330 ??K 2005 Chrylser Crossfire LTD 6K Play guitar? Go to www.cyberfret.com for free online lessons! 
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#2
03-02-2004, 10:09 PM
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to cold outside to check it
Hello 190D22
A sight glass is not effective below 70F.. You are wasting your time.
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ASE Master Mechanic https://whunter.carrd.co/ Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 2003 Volvo V70 https://www.boldegoist.com/
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#3
03-03-2004, 05:32 AM
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The sight glass has some uses... however they are never definitive. It is still valuable... if you know what the limitations (like the one Whunter mentioned for instance) of conditions and refrigerants are...
There is plenty already posted about the sight glass useage if you do a search... With regard to bubbles the rules are different with R134a as compared to R12.
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#4
03-03-2004, 09:19 AM
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Whunter and Leathermang, mention that the rules are different for R12 vs. R134, and that the sight glass is not a good indicator when the ambient temperature is below 70F. What are the differences that one will notice in the sight glass between these two gases?
Its now 35F outside here in Montreal, and I noticed bubbles in my car as well ('95 E300 Diesel with R134) I am therefore wondering what the bubbles in the sight glass indicate. Will these bubbles disappear once the ambient temperature reaches 70F?
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'95 E300 Diesel, 264,000 Miles. [Sold it]
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