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What is the coldest temp reading I can get using a thermometer in the AC duct?

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It should be about 40 degrees blow the outside ambient temperature.

Posted on Nov 09, 2010

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Posted on Jan 02, 2017

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GM products have been having problems with their electrical controlled heat/cooling system..the ativator to the duct doors goes bad..one on the driver side is an easier fix but the other near the center can be tricky and labor intensive to repair..Have a mechanic check it out...but before doing that go the your local auto parts and buy a auto heat thermometer that is designed to read air temp out of the heat ducts inside the car. Then let the engine warm up to operating temp...now turn the heat to full heat and place the thermometer in the main vents on the dash. The temp should read in the 70-80 degree range and your heat gauge should read about 1/3 to 1/2 way on the dail....If low heat open the hood and carefully check the upper hose to the radiator that comes out of the top of the engine through the thermostat..it should be hot to the touch and very firm..if warm and squishy you may have low fluid or sticking thermostat..This time of year when heat is required more often thermostats can stick in the open position not allowing the fluid to heat to the higher temp needed for your heating operation....This is a fairly easy and inexpensive repair and can be a DIY ..hopefully this is the problem and not the door activator....just remember to check the fluid level while the engine us off and cool....be careful and good luck..

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From time to time the AC on a 50 mile commute the airflow will lower to almost nothing and air temp increase while the blower noise sounds resisted. I can exit the interstate and start back up and the...


i dont know if you have a cabin air filter if you do replace it if its real dirty. most cars ac will have this problem if the ac is low on freon. when you check the freon. make sure the ac is on max ac, at its coldest setting with the fan on max. with the engine running check ac pressure. have someone hit the gas a little & see if the pressure drops. add as needed. most gauges from the parts store have a dial on the front. point it at outside temp & make sure pressure is the max for that range.

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How many pounds of r134 and how much oil ozs.


somewhere around 1.6 pounds (1lb.14ounces) of R134a if system is evacuated and 3 ounces of oil with new compressor.
keep pressure on the low side around 34-37psi & it should blow snow. Below are normal car AC pressure readings with 134A.
  • Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
  • Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI –
  • Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.
DIY recharge kit:
With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system.
Thank you for using fixya and be safe.

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1 Answer

A/c recharge what is thew psi for refrigerant


Below are normal car AC pressure readings with 134A.

Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI

Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI

Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience.

If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system.

Thank you for using fixya and be safe.

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You need to have the system vacuum evacuated, using a vacuum pump and a set of gauges, to verify that it is holding. You also must install EXACTLY the amount or refrigerant that the system calls for. Too much or too little will result in failure.

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AC booster recharge hook-up


You can only attach the the recharge hose from the kit to the low side ( A/C service port) and the cap should be blue with a leter L on it. Good luck and follow the instruction and don't over charge the system. With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold - STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the R134a and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood.  Good luck and hope this helps.

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Ac only blows hot air - clutch does not ingage -


the system is low on charge most likely, the common cause on your model is the AC compressor is leaking on the engine, replace the AC compressor and the drier and recharge.

Jul 02, 2009 | 1997 Pontiac Grand Am

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Ac compressor took one can of freon will not take other also it still is not cool


You may have over charged the system, An over charged system will also give you poor A/C performance and worst can lead to expensive repair if the compressor get's damaged.
 With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold - STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the freon and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood. 
Normal readings on high and low side with AC OFF (static pressure) - Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s - Ranges from 25-35 PSI - Note that on many Chrysler products a normal reading on the low side may be 15-25 PSI
Normal high side reading ranges from 200-350 PSI

Don’t assume that if adding little Freon is good that adding a lot is better!  Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

God luck and hope this helps. 

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