Question about 1997 Pontiac Grand Am

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Ac only blows hot air - clutch does not ingage -

Where is relay - how do we recharge the system if the clutch does not ingage. Yes - we have checked all fuses.

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  • Pontiac Master
  • 3,854 Answers

The A/C service port is by the firewall, near the passenger side strut tower. Look down past your alternator / tensioner and you'll see the service port with a blue cap on it. Best to connect the service hose first before you start the engine, don't want to loose a hand. Just follow the instruction from the kit, be careful not to 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 R143a and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood. 
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.

Good luck and hope this helps. Keep me posted, be glad to answer any question you may have. Oh and add 911 to your cell phone if something bad happens. 

Posted on Jul 02, 2009

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  • Pontiac Master
  • 75,822 Answers

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.

Posted on Jul 02, 2009

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