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a/c wont blow cold


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chevybold
New User

Mar 30, 2018, 9:52 PM

Post #1 of 3 (603 views)
a/c wont blow cold Sign In

2007 chevy 2.2l hhr.130k miles hadn't used a/c in 60 days.latellyblows warm air.blower works on all levels,dial from cold to hot does increase real hot.When control is pushed see light for a/c,fuses replaced though no suspects.Underhood,clutch spins.electric fan cycles when 2020.Baught gauge from harbor freight,readings when a/c clutch fan spins 60 high and 60 low.Since I had no freon cans,I just unhooked dual manifold gauge,noticed at high side,shrader valve is stuck(you hear it leaking),capped it with dust cover.Will the suffice or replace shrader valve on high side??


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 30, 2018, 11:39 PM

Post #2 of 3 (597 views)
Re: a/c wont blow cold Sign In

You are essentially OUT of "refrigerant" (AKA - freon) which in this vehicle would be 134a.
Having equal high and low pressures below par totally it isn't compressing at all you do need to both find the leak and when a proper charge is put in PROPERLY to the specific amount - no guessing to find if (near certain) the system can even work or if damage has already ruined the system.


Harbor Freight? If you are serious about doing more than you have already that's not the place for equipment IMO for A/C. No telling if you are using the gauges properly or if they are any good - I do like that place and the prices of some junk but not for A/C anything - Sorry it's too critical to know things are accurate and your readings could be but face it the stuff (tools and equipment) is marginal junk.


I'll guess at least your pressures were somewhat close unsure if you can really tell if compressor was trying to compress when observed on not if the pressure is correct it leaked out and just know oil is mandatory for a compressor or it will burn up without a proper charge oil in the system doesn't move when it tries.


Pics can be funky here so check the temperature/pressure relationship chart in this section here > http://autoforums.carjunky.com/..._A/C_SYSTEMS_P45460/ <
It's tells you below pressure at all for any reasonable reason WITH heat of an engine at all the system is empty IMO so far.


The end all suggestion is get a real shop that is seriously qualified to just diagnose this for you with a guess of cost to really fix this or what options you have. My guess - hate to do that is the system has suffered a catastrophic compressor failure from both the leak first then burned out the compressor. It's not that uncommon at some age and miles plus this vehicle known for lousy luck to me probably leaking at the evaporator you don't want to know so verify it but think you'll need a few thousand bucks to totally do up this system if you really want the A/C to work and last.


A/C Systems are one thing that partially faking it will cause the demise despite all the "Urban Lore" you can diagnose and fix this yourself without the mega thousands of bucks of equipment and experience to do so.


It's a tough nut. If you must have A/C where you are it's going to cost or choose to do without and disable it from trying so you can use the vehicle still,


Tom



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 31, 2018, 5:06 AM

Post #3 of 3 (580 views)
Re: a/c wont blow cold Sign In

To answer your question, yes, you do have to replace that shraeder valve.

I see you are in Texas. What is the temp there when you are trying to use this system?



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