A/C Bracket Install

Discussion in 'Fox 5.0 Mustang Tech' started by 92GreenGT, Aug 10, 2008.


  1. 92GreenGT

    92GreenGT PEAT Founding Member

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    Finally dug out my A/C stuff to put back on the car, at least I think I dug it all out. Sorry for the bad picture but is there another bracket I'm missing to be able to install the A/C compressor and the P/S pump? It's been forever ago and I can't remember back when I took it off. Any help would be appreciated.:D

    Sorry for the bad pic, was already raining so I had to hurry.
    [​IMG]
    [​IMG]
  2. 4G-KDMP

    4G-KDMP Member

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    Seems like everything but just in case.

    [​IMG]
  3. 87coupe50

    87coupe50 Member

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    I believe the only one your missing is the P/S pump housing bracket

    **just seen the diagram, it shows a P/S support bracket that mounts under the A/C mounting bracket assembly and behind the A/C mounting bracket Support assembly.

    I just changed out the P/S pump, what a PITA! Have to remove the front half of the car just to get it out. :notnice:
  4. 92GreenGT

    92GreenGT PEAT Founding Member

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    Thanks for the pic, when I go to install everything it seems I'm missing something. I guess the P/S support bracket is it, I'll have to dig to see if I can find it.

    If someone would like to go out and take a pic the best they can of how their A/C & P/S stuff is bolted up that would be great. :)
  5. 1993SSP

    1993SSP Founding Member

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    You're not missing any brackets, they are all there.
  6. MAC'n89Blckstng

    MAC'n89Blckstng Active Member

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    Yea you look like you should be good to go. I've been cleanin up my engine to repaint everything and thats all I got for my a/c system. Im takin my a/c crap out tho.
  7. 1993SSP

    1993SSP Founding Member

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    I have never understood why anyone would take a/c off of a car. Does anyone have any proven dyno numbers on how much HP it frees up?
  8. 92GreenGT

    92GreenGT PEAT Founding Member

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    I done it becuase I was young and dumb at one time. Even though when I put it back on I probably won't use it all that much, it's much better knowing it's on there and working.:nice:

    Thanks for the assurance about the brackets, I was pretty sure I kept everything. I'm putting this stuff back on for mock up and get my new belt, going to be putting a 306 in my car after I get these few things mocked up.:flag:

    -Edit-
    Is there any sort of "cleaner" or anything that I need to run through all the hoses and things of the A/C to clean them out before attempting to install everything and charge it back up?
  9. 1993SSP

    1993SSP Founding Member

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    I understand, there are so many ppl that look at my car and the first thing they say in this all bad ass tone is man you should ditch the A/C and free up some horsepower, they tell me there's no use for A/C, I then ask why would I? I have a car putting 360HP and 400LB Torque to the ground and I still stay cool on hot summer days :D

    For drag purposes I can understand ditching everything you can, but for a modest street car I don't see the need for it
  10. seijirou

    seijirou Founding Member

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    There's no HP increase for ditching the A/C, it freewheels unless it's on, and it turns off at WOT, so you can actually have your A/C on at the drag strip and you're not going to go any slower down the quarter.

    But for a race car, you can shed a lot of weight by getting rid of the A/C.
  11. 92GreenGT

    92GreenGT PEAT Founding Member

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    Is this how the bracket goes? This little bracket is kicking my ass, haha. I edited the pics with a few questions. Look over the dirty engine bay, car has been sitting forever(over a year). :(

    Pic:
    [​IMG]
  12. 1993SSP

    1993SSP Founding Member

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    The open hole uses the same bolt/stud that holds the power steering pump bracket to the block, here are some pics that I took, can't tell much but I hope they help
    [​IMG]

    [​IMG]
  13. 92GreenGT

    92GreenGT PEAT Founding Member

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    Thanks, I don't think I was tilting the P/S pump down far enough when I tried it earlier based on your pics. Shall try it again tomorrow.
  14. 1993SSP

    1993SSP Founding Member

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    Good deal, I ran into the same headache while putting AC back on my 86 notch project, it took me a few times but I finally figured it out!
  15. 67coupe

    67coupe Founding Member

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    I can't look at my car to verify right now (at work), but I'm pretty sure you've installed the bracket in the incorrect position on the head.

    The non-thread hole on the bracket (the one the arrow to the right is pointing at), should line up with the top right (or bottom right???) hole in the head. Either way, the long stud for the p/s bracket should go through this hole and into the head. In the position it's in right now, that will not work.

    I would take a picture for you, but I'm at work and it's raining out side. Hopefully someone has a picture that will show this.
  16. jrichker

    jrichker StangNet's favorite TOOL SN Certified Technician Founding Member

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    A/C recharge instructions for when you have it all bolted together...

    R134a Air Conditioner Conversion


    R134a = $7-$10 a can – takes 2 - 2 ½ cans.

    R134a compatible oil = $5-$7 for an 8 oz bottle – better get 2 bottles.
    Gauge set for recharging = $20-$120 – check out the pawn shops for a bargain before you pay retail.
    http://www.harborfreight.com/cpi/photos/92600-92699/92649.gif
    [​IMG]

    Vacuum pump – I use an old refrigerator compressor = $20- $40 at used appliance stores, or go to the Dump and get one for free. Be sure to have some R12 compatible oil handy to keep it lubed up properly.
    [​IMG]
    Pump to force cleaning fluid through the system $20-$50 (may use compressed air to do the same thing).

    O ring seal kit = $8.

    R134a charging adapter = $13 (I cut mine up to use it with the R12 gauge set that I have had for a long time).

    Plastic tools to disconnect refrigerant lines - 1/2" & 5/8" = $4 each.

    Flushing agent - Discount Auto Parts has some flushing solvent in a 1 gallon plastic bottle - try that first. Or use Mineral spirits = $4 a gallon, tetrachloroethylene =$5-$10 a gallon, takes 2 gallons of either one.

    Miscellaneous hoses and fittings to adapt the flushing pump to the system, and the R134a adapter to the R12 gauge set = $15.

    R134 Refrigerant charge is 26-28 Oz plus 6-8 Oz of PAG 100 oil.

    I did a R134a conversion on my 89GT, and used all stock parts. You will need to replace the dryer/receiver (about $75 if you get the one with the hose made as part of the unit), and should replace all of the rubber "O" ring seals as well. You will need to drain all of the oil out of the compressor and replace it with new R134a compatible oil.

    Keep in mind that to fulfill the requirements of the EPA, you are required by law to recover any refrigerant that still remains in the system. How (or wither or not) you accomplish this is up to you. Connect the charging gauge hoses to the service ports on the A/C (red gauge = high pressure, blue gauge = low pressure) and open the valves on the gauges to dump the remaining refrigerant (if any) into your "freon recovery system", whatever it may be. Disconnect the charging gauges since you are finished with them until you are ready to fill the system with R134a. Next comes the nasty part – in order to get all the old oil out of the system, you will need to flush it with special flushing solvent, or mineral spirits (ok) or tetrachloroethylene (better, but may be hard to get). If you leave the old oil in place it will congeal and reduce the heat transfer in the condenser and evaporator (read that it won’t cool good) and possibly damage the compressor.

    Disconnect the compressor and remove it from its mount to flush it with cleaning solvent. Pour about a cup of solvent into the suction port and turn the compressor center hub about 10 turns while shaking the compressor to move the solvent around inside the compressor sump. Drain the flushing solvent out and continue to turn the center hub by hand to force out any remaining solvent. Then fill it with oil: add about 6-8 oz of the new oil to the compressor large suction fitting. Turn the compressor center hub about 20 turns as you turn the compressor face up and face down to distribute the new oil inside the compressor. Catch and replace any oil that comes out of the compressor.

    Connect the pump (I had an electric sump pump I bought for $20) to the hose from the high-pressure side of the compressor. Alternately, you could use compressed air to force the cleaning fluid through the system. I didn’t like to do this since compressed air has lots of moisture in it, which is death to A/C systems. Pump the cleaning fluid through the system and let it come out the hose that was attached to the old dryer/receiver. I used 2 gallons of mineral spirits and pumped it all through the condenser and evaporator. The expansion valve is located near the firewall in the high-pressure line of the evaporator, and may cause the cleaning fluid to trickle through the lines at a very slow pace. You may want to pump cleaning fluid through the evaporator and condenser separately to speed up the process.

    Next comes the changing of all the old "O" rings so that the chances for leaks is minimized. Use the plastic connector tools to separate the lines, place the extended collar part of the tool so that it faces the large part of the connector and push inwards: this expands the spring so that you can pull the tube apart. You may need a helper to push on the tool while you pull on the tubes to separate them. Install the new "O" rings: be sure to coat them with new oil when you put them in. Install the new dryer/receiver, R134a service port adapter, compressor, add about more 4oz of oil to high pressure line and tighten up all the lines. Close the hood, start the engine, let everything get warm under the hood, but don’t add the R134a or turn the A/C on. Connect the charging gauge hoses to the service ports on the A/C (red gauge = high pressure, blue gauge = low pressure) and open both valves, then connect the center hose to the vacuum pump. The purpose of this exercise is to heat up the system so that when you vacuum it all down (yes, you will need a vacuum pump- mine is an old refrigerator compressor), that all the air, vapor and moisture from the cleaning fluid vaporizes and is removed from the system. Vacuum it down for about 30 minutes, this should give you about 28" of vacuum or more inside the A/C system. I have a vacuum gauge "T" connected into the vacuum pump line so that I can accurately watch the vacuuming process. This is a good time to take a soda and sandwich break since it doesn’t go faster if you watch it.

    Install the R134a service fittings on the system: the red goes on the high side and the blue on the low side. This will help others identify that a R134a conversion has been done on the system.

    Typical low pressure side R134 coupling
    [​IMG]

    Typical high pressure side R134 coupling
    [​IMG]

    Remove the electrical connector from the dryer/receiver and jumper the two connections inside the wiring harness side of the connector together: this allows the compressor to engage in spite of low pressure/no gas in the system. Close both charging gauge valves, and then disconnect the center hose of the charging gauges from the vacuum pump and connect it to the R134a can tapper. Put the R134a can in the can tapper and screw it down with the can tapper valve closed, then open the valve. Loosen the hose at the center connection of the charging gauge set until the R134a squirts out: this purges the line of air and moisture. The refrigerant is added through the low pressure side of the system, so open the low pressure gauge valve to add the R134a. Start the car and take note of the idle speed, then set the idle speed up to about 1200-1500 rpm, and turn the A/C on inside and set the fan speed on high. Watch for the pressure on the low side to drop off as you are filling, and the R134a can will get warm and stay warm. This tells you the current can is empty and needs to be changed for a fresh one. Before you disconnect the can, be sure to close the valve on the R134a can tapper.

    Watch the high side pressure on the charging gages and regulate the adding of gas to keep the high side pressure under 350 psi. You will probably need a fan in front of the car to keep the readings below 350 psi. I had to put the R134a can in hot water while I was charging the system with it, or else the can got so cold that it quit flowing. Use caution when you do this so that you don’t get water in the charging adapter when you change the cans. When you have added the 2 cans of gas, the high side will read about 250-300 psi and low side about 28-38 psi. Turn the idle speed back to where it was, turn the A/C off, disconnect the charging gauges, and re-install all the caps on the service ports. Remove the jumper from the low pressure switch harness and plug it back on the switch connectors. Then put the R134a Service Sticker on, secure all the loose wiring on the system and you are done.

    The typical sticker looks like this, yours may be different.

    [​IMG]

    I hope it cools good, mine doesn’t get quite as cold as it used to driving around town.

    The above technical note is for informational purposes only, and the end user is responsible for any damages or injury. The end user bears all responsibility for proper recovery/disposal of any R12 refrigerant.
  17. 92GreenGT

    92GreenGT PEAT Founding Member

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    Thanks for the article Jrichker, I found one on Corral as well so I'll be keeping both in my favorites.

    You would be correct, after messing with it this morning I FINALLY figured it out. I also had the bracket mounted on the compressor backwardds, never noticed that till I went to install it and it almost touched the radiator.:rlaugh:

    I can't believe I let that little bracket work me over like that, but thanks to you guys I got it figured out and mocked up. Not too many things to do before it's time to rip everything back out and install my other engine.:flag:

    Victory:
    [​IMG]
  18. 67coupe

    67coupe Founding Member

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    Glad you got it. :nice:
  19. ezchezze

    ezchezze New Member

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    I took my A/C off. It needed fixed and since its a convertible I decided I didnt need it. Now removeing it for power is just silly unless its a race car only.

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