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Old 10-19-2014, 09:21 AM   #1
shadmaster3
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AKA: john
Join Date: Jan 2009
Location: goodview, VA
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Vehicle: 99 and 2001 G/A owner
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Question 98 G/A Cooling Fan Runs on Hot/Cold Engine with heater contols off

Hello, I have a 98 grand am 2.5 engine with a cooling fan that runs soon as car started. The heater controls are turned off. I noticed this the other day as I was checking that my a/c wasn't cooling because the compressor was not coming on, even though it had freon added recently and everthing was working fine for a few days. Could I have added too much freon? I found 5 relays at the r/f strut tower area and the 3rd one cut off the fan when I pulled it out, so I swapped it with another relay and the fan still runs. All of the relays pins and numbers were the same. I don't know if the a/c and fan problem are the same or I have 2 different problems? Please help
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Old 10-19-2014, 12:28 PM   #2
Starglow
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Vehicle: 1999 Grand AM - LX9
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I'm not very familiar with the '98 model, but if you charged the AC system and it worked for a few days but now it doesn't then that means it has a refrigerant leak somewhere in the system. There is a pressure switch that prevents the compressor from running when the refrigerant level drops too low to prevent compressor damage. For the fan issue I'd first check the coolant temp sensor...if it's bad then the computer may have defaulted to a fail-safe fan on position.
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Old 10-19-2014, 12:53 PM   #3
shadmaster3
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Smile

It still has freon in it, and I took a jumper wire to bypass pressure switch located at high pressure hose port at r/f top of engine near radiator,but still no compressor coming on. Don't know what to do next? I will replace coolant temp sensor to see if that helps engine cooling fan problem, since relays didn't do anything. Thanks for your reply!
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