Question about 1999 Infiniti.5 QX4

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Hot air is blowing out, I had the cooling belt replaced about 5 months ago. Is there a switch I need to turn on to get the Air to work? I have never used the air conditioner since I bought it. Its a 2001 QX4

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  • Infiniti Master
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1995?? yes it will have a switch on the dash if no switch then it doesnt have AC

Posted on May 27, 2010

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1 Answer

I got a 2003 f150 that just blow hot air when i turn the ac


First thing is to check and see if there is a belt in tact on your compressor and then see whether or not the compressor clutch engages (clutch is on front of compressor in front of belt.) If so and no cold air, u may need to charge it with 134a refrigerant or have a leak that you'll probably want a shop to repair. Good luck and hope you stay cool.

Jun 28, 2016 | AC Cars & Trucks

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MY fluid in resevoir is bubbling in my 99 A4, just had timing belt and water pump replaced a month ago anything????


1. Possible air lock in the cooling system, does the internal fan blow hot air? You can blead the system through small bleeding points on the water hoses.

2. Head gasket gone, do the water pipes to the rad expand under pressure?

3. Faulty thermostat. Thermostat controls the amount of water directed to the rad.

Let me know how it goes.

Sep 05, 2012 | Cars & Trucks

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My 99 Audi A4 resevoir is bubbling, had the water pump and timing replaced a month ago anything????


1. Possible air lock in the cooling system, does the internal fan blow hot air? You can blead the system through small bleeding points on the water hoses.

2. Head gasket gone, do the water pipes to the rad expand under pressure?

3. Faulty thermostat. Thermostat controls the amount of water directed to the rad.

4. Not enough anti freeze.

5. Rad cooling fan not starting when supposed to causing overheating. Does the tempture gauge in the dash read normal.
Let me know how it goes.

Sep 05, 2012 | Audi A4 Cars & Trucks

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My 2007 toyota prado is having a/c problem. after awhile of switching on, the a/c switch light is blinking and also the recirculating air switch changed automatically to outside air intake switch on....


Check to see if the clutch on the A/C compressor is turning with A/C on max. If not then the clutch is bad or a fuse blown. Check Freon level or have a shop do a leak test. If you replace the compressor always replace the dryer as well

Oct 24, 2017 | 2004 Toyota Land Cruiser

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The air condition blow out cool air but stop in 3 second, low fan, the switch seen to work ok the inside switch, the freeon was put in to days ago the pump is turning but hi persure is not activating to...


need to replace the pressure sensor and fill up the gas 134 R or the filter gas is blocked , when is running the pipe are one hot and the others is cold be sure the vent fan is switch on

May 24, 2010 | 1997 Cadillac DeVille

1 Answer

No heat air is blowing cold


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

Oct 22, 2009 | 1998 Ford Taurus

1 Answer

Heater not working


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

Oct 17, 2009 | 1998 Ford Taurus

2 Answers

2000 GMC Sierra 4.8L V-6 - AC blows warm air


never seen a truck like this ,iam in spain but from the sound of it one belt drives a/c and another the power steering and altenator ,pos water pump as well but this could be driven by the timing belt .As i said i have never seen one of these trucks .If i had it in front of me i could soon tell you .

Jan 18, 2009 | 2000 GMC New Sierra 1500

1 Answer

A/c and heater


Is it leaking antefreeze?
The thermostat might be gone or needs a bigger thermostat
It could be a vaccum leak for the drivers side blowing cool air and the passenger side blowing warm air
Does it have dual air control switches one for drivers side and one for passengers side?

Oct 28, 2008 | 2003 Pontiac Grand Prix

1 Answer

A/c unit won't blow cold air


hi there is a belt that drives the air conditioning compressor it rides on a pulley as does the altenator visually inspect the pullies to make shure there is no belts missing if so replace now there is a relay that engages the compressor and also there is a low pressure switch that determines if there is sufficiant gas pressure in the system if the pressure has dropped re leak in the cooling system then you have no pressure to turn on compressor this would let the air conditioning to not work first check to see if you have airconditioning system pressure by looking into glass sight lens if lense is green its got enough pressure if its not green you need to replace gas inside cooling system good luck with project and keep cool

Jun 29, 2008 | 1995 Ford Aspire

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