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2005 Spectra 4 cyl.
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12 Posts
Discussion Starter #1
I have a 2005 Spectra. The air cond will work for 5 to 7 minutes. Then it blows warm. After it sets a few minutes, it works again for a few minutes. When it is working, it is ice cold.. Over and over. Any thoughts on what to look for? Thank you. Mike
 

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2008 SpectraSX, 2014 Optima LX,2006 Jeep Liberty, Linux Mint Mate
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Low air flow over evaporator...
Blocked cabin filter common... Very dirty evaporator in the car's HVAC...

Moisture in the system...
Was the AC system open to the atmosphere (parts replaced) and if so was the system properly evacuated for enough time to remove moisture?

Bad Expansion valve on the firewall or bad/dirty temperature sensor on evaporator coils ...

Over charged system (too much R134A added to system with off the shelf DIY recharging systems) or not monitoring the amount of R134A (oz or grams) used in charge left in the can on a scale... Overcharging can/will damage the compressor also...

DIY has become much harder without proper AC tools on newer systems and has become even more critical in the newest R1234yf refrigerant systems... Moisture in the system can combine with these chemicals and create hydrofluoric acid that then will attack the metals in the system causing leaks and compressor failures... A minimum of AC gauges, Vacuum pump, small weight scale and knowledge of how the tools and how AC system works is needed...

Here is a link to a Prius thread that explains a lot of general info on freeze ups...

https://priuschat.com/threads/ac-evaporator-and-low-side-line-freezes-up-all-the-way-to-compressor-stops-cooling-any-ideas.118764/
Dave
 

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2005 Spectra 4 cyl.
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12 Posts
Discussion Starter #4
My Spectra air conditioning will work, ice cold for a few minutes, then just all of a sudden it stops. If you let car set, it will work again, then do same thing. If it helps, sometimes in the winter, the heat will abruptly go cold, like no heat. I am guessing it is the same control, for both? Any ideals? MIke
 

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2008 SpectraSX, 2014 Optima LX,2006 Jeep Liberty, Linux Mint Mate
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Have you checked the AC compressor clutch to see if it disengages when the air goes warm? Too much refrigerant can cause this problem if you just add more and more refrigerant without properly monitoring the amount as most DIYers do you may have too much in the system... There are both HIGH and LOW pressure switches that will disable the AC clutch if either condition is met... There is also an expansion valve located on the firewall that the AC hoses attach to that if it goes bad will cause the same problems... Also there is a thermistor in the HVAC box that monitors how COLD the evaporator gets... You need a set of gauges, a vacuum pump, and knowledge of how an AC system functions to properly service the system...
Dave
 
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