Question about Daewoo Leganza
If it leaks 134 it will leak R-12 .I have changed hundreds of systems over to 134 without any complaints. Don't let the 94% eff rating of 134a scare you because that does not mean that your ac system will lose 6% cooling ability .A large class 8 truck or maybe a high roof van black on black and poor insulation might tax the system in the 90% range on 100 degree days but most systems never get close .
134a high side pressure will be about 18% higher so most systems you need to change the high side cutout.The R-12 electric fan switch will be ok just make sure it is engageing the fan when the pressure comes up.You must check the condensor in front of radiator to make sure air flows easily thru it.On systems where the hoses screw on each side of the dryer I replace the dryer .Drain oil from compressor and replace with 134a oil .Replace that bad valve core (with ac valve core not a tire valve) Now very very important vaccum the system and if no loss of vaccum in 20 min charge with manufactors recomended amount of oil and freon.If a system is low on freon (cycling in & out on low pressure switch) you can add a pound of charge with those small cans of same type freon no problem but when there is a leak and the charge has been lost or changing freon types you must pull a vaccum to properlly charge the system. If you just charge R-12 or 134a your system will have traped non -condensables and a large drop in cooling ability. Hope this helps. Harold
Posted on Jul 09, 2009
SOURCE: AC not cooling for 97 Passat TDI
First recharging throug the high side is extremely dangerous and is discouraged by most HVAC mechanics.
High side pressure should read approx. 5x the low side. Low side pressure should read in the 40-45psi range unless otherwise specified by the manufacturer. Guess here is the system is overcharged is you're getting 70psi on the low side. Overcharging will damage the compressor and will underperform. Below is a link to a great source of information on AC.
Best of luck with your problem.
Posted on Aug 01, 2009
no parts need to be changed the original expansion valve will work fine but the receiver dryer should be replaced and the system flushed with AC system flush and compressed air (condensor and evaporator), then the system must be evacuated with an AC vacuum pump for at least 15 minutes, the main thing to remember is that it requires only 85% as much R134 as R12 when you recharge the system, the conversion kits are avail any good auto parts store for about $35, u will need three cans of R134, charge the system until the low side port reading is around 28-32 PSI, at that point the system is full..
Posted on Aug 31, 2009
Testimonial: "excellent advice. Simple and to the point. Easy to understand"
Does the compressor run?
Low side could be high without a running compressor.
A running compressor?
The expansion valve itself is about $50 and bolts in.
You will have to remove the 134a gas before installing a replacement expansion valve and vacuum the system before recharging.
Posted on Sep 07, 2009
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