Question about 2000 Chevrolet Silverado

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Adding r134a to 5.3l

Can you help me locate valve in low side tube to add r134a? all I find is a valve near the firewall in the SMALLER tube, and I know the larger tube is supposed to be the low pressure side where you add.

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You have two ports one on either side of orifice. one is high and other is low

Posted on Aug 21, 2008

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How and where to add freon to a1995 sedan deville


Verify ambient temperature is above 65 degrees F.

1. Safety> - safety glasses, long sleeves and gloves, (exposure to refrigerant can cause frostbite).

2. Attach hoses to manifold> assembly, (hi, lo, and fill).

3. Remove caps from service ports, (Low press. Larger tube from evaporator to accumulator - passenger side over fender well; High Pressure - smaller tube from evaporator along firewall towards driver's side). Verify service> ports are clean.

4. Attach low press. and high press hoses to proper service ports.

5. Start car>, reset low refrig code, and turn ac on high and fan on high.

6. Read gauges and compare with chart provided with gauge set.

7. If low and high press readings are both low, then system needs recharge.

8. To recharge, attach fill hose to can of R134a and slowly open low press valve>, (NOT HIGH PRESS VALVE), until low press side reads 40 psi.

9. When flow stops and pressures stabilize close valves> and disconnect manifold from service ports and refrigerant can. Replace service port caps.

Aug 19, 2015 | 1995 Cadillac DeVille

1 Answer

Where is the low side port to add r134a to 1996 olds acheiva


locate the A/C lines along the passenger side that go from the condenser to the firewall. the low side port is smaller than the high side port. you have to look at the ports to see the difference is size and they each should have a cap screwed on them to keep dirt out of port.

Jul 12, 2015 | 1996 Oldsmobile Achieva

2 Answers

Where is the low presure valve


Usually the port is on the compressor or one of the metal lines going to the condenser.

Jul 04, 2013 | 2000 Ford Expedition

1 Answer

Where is my lo intake valave for my a/c on my 98 dodge grand caravan


The low side fitting is on the passenger side of the car, near the compressor and the headlight area, close to the drive belt, about 12" away from the radiator. Locate the black screw dust a cap, looks similiar to a valve stem cap on your tire valves. The high side connector is located in the engine compartment, passenger side, near the fender well back towards the alternator and very close to the drive belt. The high side fitting is much harder to find than the low side, the low side is in the open. The fitting you have for adding R134a from the recharge kit will not fit on the high side. The high side fitting is smaller than the low side fitting. Thank goddness for that for if you were capable of putting the fron can onto the high pressure line, it would develope so much pressure from the high side, it would or could explode in your presence.
Please be aware that you need to wear protective eye and hand gear when working on an a/c system(freon can blind you if sprayed directly in your eyes and can cause frost bite when over exposure to your skin.
Happy Motoring!!

Jun 09, 2010 | 1998 Dodge Caravan

2 Answers

Adding R134a, can't seem to get the hose fitting on the vlave and probably have now let out more than can worth I was trying to put in. I am trying to add to the valve near the firewall adn not the easily...


If you have to add refrigerant,you have a leak.
If you have a leak,don't polute the atmosphere with cfc.
If you have no HVAC training in general,do not work on an automobile.
If you add too much refrigerant,and you will,because you have no way of knowing how many oz's are in the system,you could damage the compressor.
With the older R12 cfc, you need to be licenced just to buy and use it.
So leave all Auto A/C work ,to a shop the knows how to do it responsibly

May 28, 2010 | 2006 Ford Five Hundred

3 Answers

Locate a/c high low valves.


The low side should be located on the thing that looks like a can against the firewall. I won't tell you about the high side, this wil just get you hurt.

Aug 29, 2009 | 2001 Ford Escort ZX2

1 Answer

Is the A/C low side port at the firewall, passenger side?


the low side ac valve, should have a blue cap. and is the smaller of the 2 valves. that smaller one is what you would need to use to refill the system..if you are planning on refilling the ac, make sure the bottle you get to refill with is the right fluid... some earlier cars still run on r12, and some run on r134a. if you are going to fill it, have the car running and then check the pressure before you add any fluid cause you will mess the system up adding to much... hope this helps you..

Jun 11, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Low and high side of the A/C system and type of refrigerant?


Hello, and thank you for your question.

The High side & Low side valves are located in the engine compartment, and can be found on the aluminum lines running from the condenser to the firewall (a bigger tube, this is the HIGH side), and from the firewall to the condensor (in front of the radiator), & back to the compressor (this is the LOW side/a smaller tube). Regarding the refrigerant, you may have a dilemma. Most LCs in 92 came with R-12 freon, and is very expensive to purchase, and, in some places, a license is needed to purchase it. Your system *** may *** have been retrofitted with the "new" style (the "enviromentally friendly" type R-134A) refrigerant. To determine this, look under the caps on the abovementioned tubes. If the metal fittings are small & threaded, you have the original system. If the fittings are large, and are screwed onto a smaller fitting, and are grooved at the center of the upright stem, you have the newer style. You would also have rather large caps with a "H" ans an "L" imprinted on them. If you need to add refrigerent, add whatever refrigerant required into the LOW side, until the bubbles seen in the sight glass adjjacent to the radiator (on the Low side tube) disappear.

Oct 03, 2008 | 1992 Toyota Land Cruiser

1 Answer

Air Conditioning


#1 you will need r134a freon. #2 the low side service port is located right at the firewall where tha line goes to the evaporator. #3 if wou bought a can of 134a freon with a hose that will hook to it, it will work. all service fittings for 134a freon are the same even though the high side and the low side will always differ

Aug 18, 2008 | 1998 Oldsmobile Cutlass

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