Question about 1993 Cadillac Eldorado

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Freon tank in the way. The freon is low, but is it still under a lot of pressure?

I want to remove the freon tank so I can install new coolant tank. How do you remove the freon tank

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The A/C CONDENSER does not have to be removed in order to replace the RADIATOR, Just take off radiator hold down cover, hose, lines and remove . Hope this helps

Posted on May 16, 2009

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How do you bleed the air from the cooling system of a 1999 v6 pontiac grand am


Refilling Procedure




Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL?"¢ coolant. If coolant other than DEX-COOL?"¢ is added to the system, the engine coolant will require change sooner: at 50 000 km (30,000 miles) or 24 months.






  1. Close the radiator drain cock.


  2. If previously removed, install the engine block drain plugs.


  3. When installing the drain plugs, use pipe sealer GM P/N 12346004.




    Important: On vehicles equipped with the 3.4L engine, open the coolant air bleed valve. The coolant air bleed valve is located on the top of the thermostat bypass pipe/heater pipe assembly. Close the valve once a continuous stream of coolant is expelled from the valve.



  4. Fill the surge tank to the base of the filler neck.


  5. Start the engine with the pressure cap off. Run the engine until the upper radiator hose starts to get hot.


  6. If the coolant level in the surge tank is low, add the proper mix of coolant until the level reaches the full cold line.



  7. Important: After servicing the cooling system, and if the vehicle is equipped with an intermittent low coolant light, an occasional low coolant light may be encountered during some extreme driving maneuvers. This complaint should be eliminated by removing the surge tank cap and adding coolant to a level just at or above the full cold line when the system is cold.



  8. Install the cap onto the tank with hand tight pressure.



Recycling Procedure




Important: Dispose of used coolant in a proper fashion, such as in a used coolant holding tank. Never pour used coolant down the drain. Ethylene glycol antifreeze is a very toxic chemical. Disposing of ethylene glycol antifreeze into the sewer system is both illegal and ecologically unsound.



There is currently no approved method for recycling used DEX-COOL?"¢ coolant into new DEX-COOL?"¢ coolant. DEX-COOL?"¢ coolant can be recycled into new conventional coolant. Consult local listings for coolant recycling facilities in your area.

Dec 31, 2015 | Pontiac Cars & Trucks

1 Answer

Air conditioning stopped working step for trouble


There are several ideas on test gauges for A/C pressure. You need to find out if you have any Freon pressure in your system. Low pressure will activate a cut-off switch to protect the compressor from seizing.

If you look at the passengers side of the Firewall, under the wiring bundle attached to the Firewall, the low pressure fitting is on the black oblong tank. The pressure cut-off switch is on a A/C line leaving this tank.

You can by-pass the cut-off switch with a wire loop to see if the compressor engages and what the running pressure is for the system. You can work with low pressure better than some other problems.

There are Freon cans with sealant and conditioner which can fix minor problems. Once you get enough pressure to deactivate the cut-off switch the Freon should be pulled into the system.

Have windows open, A/C on Max, and then use the gauge to keep from overfilling the system.

Oct 16, 2013 | 1999 Ford Expedition

1 Answer

Charging air conditioner


There is a lot to doing the job correctly, but sometimes with luck you can get acceptable results with minimum expense and effort. It all depends on how much Freon is left in the system.
The repair for a system with remaining Freon in it is a different repair job from a system that is empty. The Freon pressure keeps worse things from happening. You will find a fitting to add Freon on the accumulator(black oblong tank) or on a line close to that part. With the engine running and A/C engaged; you need to check the Freon pressure with a gauge.
If the A/C compressor is not kicking in, the connector on the low pressure switch needs to be disconnected and jumped with a looped wire. Add Freon if you have low pressure. Note the pressure because the low pressure switch has a rated working pressure and weak pressure switches can cut out early.
Fill the Freon to a moderate working level. You want the A/C to stay working longer which it will do when it is charged between the high and low pressure limits.
But if you find that there is zero pressure in the system, at a minimum you need to rent or borrow a Vacuum pump and evacuate the system. Then add Freon with a sealer and a small oil charge. Operate the system and drive 20 minutes minimum to circulate the sealant. Check pressure after 24 hours and top off the Freon charge.
If the leak did not seal, you will need professional help and tools to replace the leaking part. There are leak detectors, but some of the fittings require special tools to change.

Jul 16, 2013 | 1996 Ford Thunderbird LX

1 Answer

Low pressure valve for ac


In general the Low-pressure valve is a safety feature to protect the A/C compressor from damage. The valve can be changed without too much effort, sometimes the spring inside can become weak and activate at a different pressure than designed. With strong grip, it can be changed by hand, using care not to twist the a/c lines it is mounted on. It has an electric connector which has clips to secure it and they must carefully be unlatched.

There are 2 valves which are similar in appearance and the low-pressure part is closest to the black oval tank or even mounted on the black oval tank. You want to be sure to change the correct one. This will only help you IF the original part was defective.

When this part is working properly, it prevents the A/C from working when the Freon is low. If the Freon is low there are many possibilities why this happened. Each car is an individual case. Depending on the size and location of the leak, sometimes an additive in a new can of Freon with a sealer/conditioner can help. Sometimes too much air leaks into the system and it needs to be purged and you start over fresh.

Autozone has loaner tools to create a Vacuum in the system, measure the pressure in the Freon lines and do other repairs. It is a free program with refundable deposits.

You can go to an autoparts store and ask to see the correct part. The clerk may even look under the hood of your car to show you where it goes. If the valve is bad, replacing it can fix the problem.

You should not lose but a whisper of Freon when switching this part. But if the part is good, you need to address the low pressure. Freon has gone up so much that a mistake is costly. Use to be that you would try adding Freon first to solve a problem when Freon was $2.50 a can.

Also watch for the size of the can of Freon. Many shady ads will sell you short cans of Freon at a "discount" price. You pay less but get less.

Since each car must be judged by inspection results, its a specific call on what to do.

May 28, 2012 | 1994 Buick Skylark

1 Answer

Compressor starts then shuts off


Hello, This usually happens when the Freon is low or if someone has added Freon, the level is too high. You need to use a gauge on the low-pressure fitting to determine the minimum pressure in the system with the A/C on and the engine running.

The low pressure fitting is usually on the black oblong tank or close to it. There is a connector on the A/C line from the black oblong tank where it looks like a switch attached to the line. There are 2 switches, but the low pressure side is closest to the black tank. Remove the connector and make a "U" shaped wire connector to insert in the wire. This will jump the switch and activate the compressor clutch. Then the system is ready to draw in the Freon and after the first can, should be ready to work without the jumper wire. Reconnect the wire to the low pressure switch and measure the pressure with a gauge. Then top off the system. There should be a label in the front of your van with the capacity of the A/C.

It is best to initially purge the system with a Vacuum pump, but most top-offs will last at least a Season if you have no leaks. You can get tools under the loaner programs at Autozone, Advance, and Oreillys. There are also products which can stop leaks, trace leaks, and if your compressor is noisy, add oil to the system. Ask your parts counterperson about them.

If you find the the system has proper Freon, but cuts out, the Low pressure switch is easy to change and is what you change if you find through bypassing this part, that the system works better.

If you do not want to go through all of this, jump the Low pressure switch, add a leak repair additive, add some Freon until the compressor engages steady.

Jul 04, 2011 | 1997 Ford Econoline

1 Answer

A/C turned warm and got a loud clicking noise from under the engine. Small amount of initial visible smoke and smell. Noise goes away when A/C turned off. Is it the A/C clutch? Can that be replaced...


Hello, It can be the clutch but you need to test the residual pressure in the system as is. The clicking sound indicates the clutch is being switched off and on by the pressure switches. The smoke and smell can be the Freon escaping from a hole in the lines. Or the last gasp of the Freon created ice deposits which melted on the exhaust pipes and is now gone.

A quick explanation of the pressure switches and clicks. You have both a low and high pressure cutoff switch, the ideal pressure is theoretically in the middle of these 2 pressures and kepts the clutch running the longest. With too much Freon the pressure gets too high and the high pressure switch cuts off the clutch; with too little Freon the low pressure switch cuts off the clutch.

You need a tool to test pressure. The low pressure switch is on the freon line close to the black oblong cylinder. If you unplug the wire to this switch and make a U shaped coated jumper wire, you can make the clutch engage by inserting the wire into the connector while the engine is running. Do this for less than a minute if you are not prepared to add Freon, then remove the jumper.

You now know the problem is low pressure if the clutch turns on. Remember to have the dash controls set for the A/C. If the clutch did not engage, check your fuses, then blame your clutch.

Many of the autoparts stores have tool loaner programs. Check with the parts store for the A/C clutch and what tool is needed to change it. There is some room under the hood of a Grand Marquis and it may be possible to replace the clutch without removing the compressor or lines.

If the problem is low pressure and not the clutch, you must find the leak. Get a can of Freon with leak detector, jump the low pressure switch and add the Freon to the oblong tank by the Firewall.
Then repair the problem identified and purge and recharge the system. The autoparts stores loan out the Vacuum dryers.

May 04, 2011 | 1997 Mercury Grand Marquis

1 Answer

Need to change out a/c pressure switch on a 95 chrysler cirrus .is it hard to do? 2.5 engine


it is not hard to do just be certain you have the proper socket wrench for removal and installation, proper way to do it is to have the system evacuated with a vacumn pump but if you want it done quick and cheap, be sure the engine is off as well as the a/c...just loosen the switch, wear protective clothes and googles so freon doesn't blind you or give you a spot of frost bite on your fingers when removing the switch. Make sure the new switch has thread sealant on the threads before installing to be certain the threads on the new switch wont allow any freon gas to leak out when the system is running.
IF YOU LOST A LOT OF FREON GET A FREON INSTALL FITTING KIT WITH AT LEAST TWO CANS OF FREON 134A AND INSTALL THROUGH THE LOW FILL PORT WHICH IS THE SMALLER FITTING THAT IS EMBEDDED INTO THE LARGER DIAMETER A/C LINE, (sorry for the caps) .............. make sure you have the a/c system on high blow full a/c and the engine idling while filling the system, if the freon wont gho in due to the a/c compressor clutch not engaging jump the new low pressure a/c switch connector out with a jumper wire accross the two wire terminals until you are done charging the system.
Hope this helps.
Happy Motoring!!

Jul 15, 2010 | 1995 Chrysler Cirrus

1 Answer

Is engine temperature badly affect AC compressor prformance ?provided that i bought a new compressor since 9 months but now stop function despite adequate fereon


It should not affect the A/C compressor. The A/C coils are actually in front of the radiator so the A/C should cool regardless.

Here's what you want the system to do. You want the Freon to maintain a steady pressure when the A/C is on. There are 2 pressure cutoff switches. 1high, 1low pressure. The compressor will cutout when either switch is tripped. This means a moderate amount of Freon is supposed to be in the system to avoid tripping the switches.

At this point your dryer tank will frost or sweat, the lines from the tank will frost too. The Freon can remove the most heat in this condition.

You can loan tools from Autozone or Oreillys with a deposit. You need to measure the pressure in the system and have the car windows rolled down and air on high to make it perform. Also use the correct "oil charge", the compressor will fail without oil.

Your compressor will not start if the pressure is below the Low pressure minimum. You may want to change the LOW pressure switch. If the compressor does not start, check the fuse or add Freon. The compressor will not run if there is too much pressure. Measure and remove Freon to cancel the high pressure switch.

When you have your pressure right everything should work providing the system was properly prepped before the Freon was added. Final note, the manifold gauges show TEMPERATURE variables for installing Freon. In simple terms, Freon is a gas that expands and if you add it in Cold weather it will expand and have higher pressure and be overfilled in Hot weather.

Apr 26, 2010 | 1996 Mercury Grand Marquis

2 Answers

How do I change the fuel filter in a 1999 Buick Century Custom?


Philly, the fuel filter is attached to the frame in front of the gas tank, under the driver side of the car. You must relieve the pressure in the fuel line before you start, and it is also recommended that you disconnect the neg. battery cable. After disconnecting the neg. cable, remove the gas cap. Next, look under the hood on the fuel rail for a shrader valve (like the type on a bicycle tire). Place a rag under the valve, remove the cap, and press the valve in with a plastic pen to relieve the pressure in the line. You can now go under the car to remove the filter. You can disconnect the fuel lines easily with an inexpensive plastic disk made for this purpose (only a few $ for several sizes at a parts store). Be careful of fuel in the line that will drain out, no smoking or sparks during this procedure. Should be 1 bolt securing filter to frame. Note arrow on new filter, and install in the correct direction. Replace cap on shrader valve, put gas cap back on, reconnect battery cable. The low coolant light is probably a faulty sensor signaling that it's low, when it's actually ok. Look for wires coming from the reservoir bottle, you should be able to find the sensor at the end of the wires to replace it. If you change the fuel filter in a garage, leave the door open for air circulation, gas fumes can explode easily, having the door open will help dissipate the fumes.

Apr 05, 2009 | 1999 Buick Century

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