Question about 2000 Pontiac Grand Am GT

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Air fuse under hood will that cause my air to blow hot it is the 30 amp big fuse compress is good freon is good

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Hi, if the Compressor is running and you can see and hear the clutch on the front of it engage, the 30 amp fuse is good and not blown. Have someone in the drivers seat, in park, brake set turn the a/c on after the engine is already running. You stand there and watch while they turn it to full cooling. You should see and it the part on front of the compressor click and come on and stay on. If it does not come on, this is an indication that there is no freon in the unit.The pulley will turn with the belt, but the plate in front has to come on for it to pump. If it goes on and off cycles like that, its low on charge and is cycling on the low pressure switch. Check these things I have said and keep me posted. If it does cycle on and off, you can pick up a can of R-134A with hose and gauge at auto store and charge through the low side. If its out, it will take about 2-12oz. cans. Let me know how it goes. Please be kind when rating if I have been of help to you. I wish you the best!
A/C & Heating Contractor

Posted on Jul 03, 2010

Testimonial: "thankyou so much but come to find out the fuse is not even there at all when i took it to the dealer it was working fine and when we open the fuse boxs there is not one in there"

  • Robert Horton
    Robert Horton Jul 04, 2010

    Hi, thats strange? It must have been wired passed the fuse to start working. Than you for the awesome rating. I wish you the best. Happy 4th!



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Hi there... About 2 months ago my air conditioning was blowing hot air while air con was on cold Hyundai replaced the compressor after numerous phone calls & second opinions now my air compressor is...

I can tell you general principles about A/C but have not worked on a Hyundai. If the A/C lines under the hood and directly from the black cylinder tank are frosted or sweating, you have Freon circulating.

There are 2 cutoff switches in all systems. A low pressure and high pressure cutoff. The ideal amount of Freon is in the middle of these 2 pressure points.
In this way the compressor clutch will stay engaged the longest and keep the Freon circulating the longest. This is the way you get COLD air.

There are ways to measure the pressure and to find leaks. You can sometimes loan tools from Autozone or Oreillys for a deposit. Before blaming another electrical problem for the lack of COLD air you should test the pressure of the Freon left in the system. If you are within 90 days or 3000 miles, most minimum warranties cover the parts. With factory warranty it should go farther.

In answer to your electrical concern, yes there is another system controlling the A/C. The ductwork has either vacuum operated or electrically operated doors (flaps) under the dash. These "doors" blend the airflow by mixing cold and hot air to give you the temperature you want. If you want all COLD you keep the heater door shut and so on.

So you look at these areas separately first. Under the hood is the Freon pressure good? Pipes sweating? Compressor clutch on steady? And if everything under the hood is good, then you look inside the car at the ductwork.

I hope this helps you.

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If it blew cold air after freon added and 5 days later blew warm, you may have a leak in the system. Also check and see if compressor comes on if not you may have an electrical issue, relay for compressor,coil on compressor, etc.......

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2006 chevrolet hd 1500 no ac itseems like its blowing hot air out

Look under the hood on the driver's side there will be a fuse box. On the top cover there is a diagram to find the a/c fuse. If the fuse is good then check the a/c relay. If that is good also then you may have a freon leak. Good luck. Keep me posted please.

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