That could be due to a bad relay, bad fuse or a failed fan. The fact that they both work intermittently sounds like a problem with the blend door. If you’ve checked all the electrical components, then you might also check the pressure in your system to make sure you don’t a refrigerant leak also. Thank you for asking about your Chevy Suburban. Since it is a computer controlled system, if resetting it doesn’t work, your only other alternative would be to replace the climate control computer. I can hear a slight hissing noise. When it is working and the engine is running it stays on and is consistently cold. But when the ac unit isn’t serving its goal, things become a little uncomfortable for us all. Sounds like you can help us figure out what our problem is. It sounds like you’ve got a leak in your system allowing the refrigerant to escape after you add it. I own a 2010 Lexus..few days back..the ac was throwing cold air whn in low speed and whn i accelerate the cooling goes off and it starts throwing hot air..i thght the gas was low..and indeed it was low whn i got it checked up..they fill the gas and thn it started working fine..this is was 2 days back..and now it is not cooling at all..it is throwing hot air and i sweat like a pig (its a black car and i stay in Gulf)..i got it checked up and they said simply change the compressor/evaporator without doing enough testing..i thinnk thats not the appropriate solution. If the lines are close they could be getting damaged during the oil changed. If it turns out the Freon level is full then you may want to take the van to an A/C Specialist to have the problem diagnosed. If your low side pressure is too high, it could indicate your system is over filled which would cause a high pressure. When it is not cooling when I start the engine I can feel air blowing thru the vent, it pauses then drops down to the floor vent and the back up to the cabin vent with warm air. Usually when you get different temperature air from different sides of your car the problem is with your dual climate control system. Can a broken condensor fan send a signal to the computer in the truck to not turn on the compressor? This could be an electrical issue or due to a worn out AC clutch. I have a 2002 Nissan Sentra. Then it will gradually get warmer until it is hotter then the air temperature outside. Thank you ahead of time and I appreciate the help! The pressure is reading high (100+) when attached to the low pressure valve, and most advice I’ve seen online says not to add more refrigerant if the pressure is high and the compressor appears to be running properly (which it does). Thanks for your question about your 99 Grand Prix. We recently bought a 2000 Mercury Cougar for my daughter. Thanks for your question about your 2001 Honda Civic. I have an AC refrigerant charger with a gauge that only goes on the low side, but without the clutch kicking in I’m unable to read correctly. If the fans don’t come on, check the electrical connects, fuses and relays for your fans. Thanks for your question about your Nissan Sentra. Had a recall done on my 2010 H3 Hummer they replaced the connector module and harness on my HVAC system, Hello, seems I have same situation here in my Mitsubishi Pajero 2009. What can I all check to see what the problem is? I got in to use my AC on the first warm day of the year a few months ago, and the AC didn’t work, as in blowing hot air when on the cool setting. The symptoms you are having are a little tough to diagnose. If it is broken and stuck on the “heat” setting it could be reheating your air conditioned air causing warm air to blow from your vents. Thanks for the support. The other possibility is that your AC compressor is going bad and only has enough power when your engine is at a higher RPM. It sounds like your compressor may not be kicking on properly. Your problem could also be a clog in your system or an overfilled system. The ventilation fans blow air over the matrix and into the car. It’s possible you are low on refrigerant. When attempting to add 134a freon, after connecting the filling hose to the low side, the needle on the gauge was pointing to the high Red Danger area. You can use the gauge on a refill can of refrigerant available at most auto parts stores. I have a 2003 Hyundai Elantra. I never found any dye except where a little dribbled from the port I put it in. If this happens the entire heater assembly has to be removed. Based on your description, the most common reason may be that the system is slightly low on refrigerant. I’m dying in this Florida heat and want to order a replacement if the blower could be the problem. If you find your car’s AC is blowing hot air instead of blowing cold air, it is important to identify the problem with your AC system and fix it quickly for your comfort and your safety. So, the air wouldn’t come cold from the dirty car ac condenser anymore. Any ideas? Thanks for your question about your Honda Civic. Hello, I got my AC checked out due to blowing hot air and two auto repair shops told me the ac compressor was bad. I have a 2 hour drive between mine and my parents house on the open road highway where the speed limit is 75-80, and recently whenever I have been driving that highway for about 1.5 hours my AC stops blowing at full power and also isn’t blowing as cold as it should be. Honda dealer and they installed an A/C specialist off and turn it back to proper! Those cans of freon but it ’ s really hot actuators generally fail first car blowing hot air instead of cold may be this! 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