Hello guys!
I'm about to service my HVAC system and I'm wondering if anyone has done it before...?
I have L300 1993 dual AC system.
Shows R-134a post 91 but some still used R-12...?
If so... To whom do you know what type of refrigerant was inside (R-12, R-22, or R-134a)?
Also, to whom, did you have to add fittings so that a R134a Manifold gauge shreder valve could fit on?
And finally, did you have to replace the CCOT valve?
Thanks to anyone who can answers those!!!
HVAC reseach!
- ChuckBlack
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HVAC reseach!
L300 Jasper,
L300 Chamonix,
Pajero Mini,
Pajero GDI
Pajero DiD
L300 Chamonix,
Pajero Mini,
Pajero GDI
Pajero DiD
- Growlerbearnz
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HVAC reseach!
I serviced mine: rebuilt the compressor, replaced all the O-rings, flushed the lines, and replaced the receiver-dryer, switched to R134a at the same time (Mine's a mid-'91, originally R12).
Mine had a service sticker under the engine cover saying "R12". The definitive way to check would be to look at the fill ports: I had to add R134a adaptor fittings. They just screwed right on.
Mine has expansion valves (TXV) rather than a CCOT, so no worries there. I don't see any mention of CCOT in the workshop manuals so I imagine yours has too.
I don't know how much oil or refrigerant was added- I left that (and the drain/flush/refill) to the AC shop. They also supplied the compressor rebuild kit and receiver-dryer.
Mine had a service sticker under the engine cover saying "R12". The definitive way to check would be to look at the fill ports: I had to add R134a adaptor fittings. They just screwed right on.
Mine has expansion valves (TXV) rather than a CCOT, so no worries there. I don't see any mention of CCOT in the workshop manuals so I imagine yours has too.
I don't know how much oil or refrigerant was added- I left that (and the drain/flush/refill) to the AC shop. They also supplied the compressor rebuild kit and receiver-dryer.
Nothing says "poor workmanship" more than wrinkles in the duct tape.
- deskinthewoods
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HVAC reseach!
So, am I to understand that you can just replace R12 with R134a? That it doesn't matter which refrigerant you use?Growlerbearnz wrote:..., switched to R134a at the same time (Mine's a mid-'91, originally R12).
My dad used to say,"If you can read, you can do anything!"
- Growlerbearnz
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HVAC reseach!
Correct, though you have to flush all the R12 out before putting R134a in, and you need to change the fill ports (R12-to-R134a adapters just screw right on). It's a good idea to flush out the old oil too- R12 oil is allegedly compatible with R134a oil, but your oil is 25 years old. It's a good time to replace it.
Nothing says "poor workmanship" more than wrinkles in the duct tape.
- deskinthewoods
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And how does one flush the lines?
My dad used to say,"If you can read, you can do anything!"
- Growlerbearnz
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HVAC reseach!
I've always had the AC shop do it after they've removed and safely disposed of the R12 (we Kiwis are a little touchy about ozone depletion and the resulting skin cancers).
...though it looks like you can buy flush kits online. Not sure how they work, it looks like a cannister of solvent, perhaps propelled by compressed air. AC shops usually have a machine that does it.
...though it looks like you can buy flush kits online. Not sure how they work, it looks like a cannister of solvent, perhaps propelled by compressed air. AC shops usually have a machine that does it.
Nothing says "poor workmanship" more than wrinkles in the duct tape.
- deskinthewoods
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HVAC reseach!
Thanks for that info, Growlerbear
My dad used to say,"If you can read, you can do anything!"