Auto Air Conditioning & Heater Repair: 2005 hyundai sonata a.c., 2005 hyundai sonata, hyundai sonata

Question
QUESTION: what is the low pressure reading i should be getting when engine is idling 73f outside temp.on a 20005 sonata.

ANSWER: HI Armido

At that temp.  your reading should be about 28psi to 35psi.

---------- FOLLOW-UP ----------

QUESTION: i thought so to but if i put pressure up to 25 the comp starts to squeel and cant run properly plus  the temp. inside goes up to 60s and 70s. this system is suppose to hold 1.1 lb of 134a. i have  found that the comp. runs best when it  cycles from 15 to 40 a lot but the inside air temp. holds at 38F on max a.c. i am wondering if hyundai uses difrent system?

Answer
The principles are the same try and see what your hi pressure is.  It should be 180 to 225. If so then leave it like that.  Also as you go higher from sea level your pressures will drop.  Did not take that into account.  Try and get me the low and high pressures.  Check and make sure your fans are working.