Question about 2000 Volkswagen Beetle

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I have replaced the compressor and the expansion valve on a 2000 beetle and a/c still wont get cool. Low side PSI 70 high side PSI 110...cant figure out what else could be the problem

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  • Volkswagen Master
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Not enough gas.

Posted on May 04, 2013

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5 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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dcgun007
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SOURCE: 1998 vw jetta wont a/c wont cool

Flushed system replaced compressor, expansion valve and drier, evacuated system then let set overnight to check for leaks now replacing oil then I will charge the air.

Posted on Jun 21, 2009

alicantecoli
  • 22156 Answers

SOURCE: 1998 Jetta TDI - AC compressor turns but no cooling

something not right here ,firstly why didnt you just renew the clutch instead of a complete compressor ?? secondly do you have a machine to recharge the system and if so are you using it correctly ,the reason i ask is because in the machine the low and high pressure pipes are interconnected in the body of the machine so yes it would show these pressures.When refilling a car once machine has weighed the gas leaving the bottle shut off the red line and start engine leaving the blue line connected ,run engine at 2000rpm with A/C on full for about 3 mins to draw the gas in from the machine .Then close blue line and and do a recovery to see how much gas was left in the machine.Also did you put compressor oil in when you re fitted the compressor about 100cc is enough ,this is better put in directly into compressor ,then vacumn to about -750mg or a stage one vac pump and omit the oil recovery cycle .When running the air temperature coming out should be about 7.5centigrade is good but some cars will drop to 5C anything below 9C is ok ,and forget to clean out pollen filter

Posted on Jun 22, 2009

greg_margo
  • 1959 Answers

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.
http://www.cyberbright.com/autobin/air_conditioning.htm
Best of luck with your problem.
Greg

Posted on Aug 01, 2009

johnf1aresti
  • 1098 Answers

SOURCE: 2000 vw Jetta ac not cooling, ac compressor is on, freon level good, with ac manifold gauges high and low side fluctuates from 50-60 psi on low side.

try to throw cool water on the condencer front of the engine radiator and see whether any cool air comes in the car. If so see whether the pressure valve is working okey or not because might the pressure is not sufficient.

Posted on Sep 05, 2012

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What is the high side reading? That's too high for low side maybe overcharged. Plugged expansion valve (no orifice tube) will cause low to neg psi low side.

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sounds like the expansion valve or the orfice may be clogged is your compressor making noise like a clinging inside if it isyou'l need to change the accumlator dryer as well as expansion or orfice along with the compressor. you could try what are the pressures with a fan in front of the vehicle if they go to 35-40 psi on low side and 200-250 psi on high side these are close to where they should be.

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Why was the compressor diagnosed bad?Did it send anything into the system that may have blocked a line?Did you flush the complete system?
I would have started the compressor by jumping the low side switch to make sure it could pull a good vacuum before adding any 134a.
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Did you replace the expansion valve?
Also try adding just a little more freon and see if that makes a difference....is there a sight glass you can view with the system activated to be sure you have it completely air free?

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These numbers are a little high depsite the high ambient conditions.Amazingly enough ,automotive low side suction pressure will equal the degrees its putting out at the evaporator coil...for instance,70 psi low side pressure will produce about 70 degrees of cooling. At 300 psi on the high side(which is high) this is about as low as the suction pressure will go....you need it to go lower.I would probably be concerned with the freon level as a slight overcharge could boost these numbers.Poor air flow through the condenser can also create a higher head pressure than desired.If possible,I would evacuate and re-charge the system with the correct amount of 134a refrigerant. Try to get those pressures lower...about 250/50 would be a decent pressure value in this ambient condition.Verify good airflow through the coils and pay close attention to any foreign debris like plastic grocery bags or wrappers covering the coils...Ive even seen these make their way between the small gap between the condenser and radiator so use a light and inspect carefully for this.Air flow through that condenser coil is vital and any deficit there will create high head pressure which obviously causes high suction pressures....good luck

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