04 Hyundia Sonata LX, engine performance drains with AC running
I have an 04 Sonata LX that runs great with the AC on when outside temperatures are below 80 degrees, but when the temps. get over 80 degrees the problems start. Yesterday it was 87 degrees in Ohio and the car ran great with AC on for about ten minutes, then the dragging feeling started. The engine felt like I was pulling a trailer and the transmission felt like it was trying to shift to maintain the speed. It is really noticeable when you go up a slight grade. My local garage can not find anything wrong with the compressor, but they were checking the car in the morning when it was still cool outside. I am going to try and take it back to the garage when it is hot and acting up again to see if they can catch it in the act, problem is it is getting costly with no results as of yet. Is there some type of temp. sensor that would be causing this action to happen? Thanks for any help, Jeff
Dear friend-you are correct when you say it can be a tempreture switch that might be at fault.your air con take a lot of torque away from your engine when kicking in so you need something to compensate and restore the torque.a sensor is added into the system to do exacly that and works of a signal coming from the temp switch.that unit is normally mounted on the fire wall.
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Changing the oil in a Hyundai Sonata is an easy task that should be performed every 3,000 miles. Follo the below steps to change the oil on your Hyundai Sonata: 1) Ensure the car is parked on a flat surface. Place a drain pan under the engine. Locate the oil pan directly under the engine. The oil pan will be at the very bottom. Now, unscrew the drain plug at the front of the oil pan with a socket wrench. Allow all the oil to drain out into the oil pan. Tighten the drain plug back into the oil pan with a socket wrench. 2) Locate the oil filter in front of the engine. There will be a cut-out in the protective shield where the oil filter is located. Unscrew the oil filter with a strap wrench. Allow the oil to drain into the oil pan. Place the old filter in with the waste oil. 3) Fill the oil filter with fresh engine oil. Screw the filter on to the filter housing by hand. Do not wrench tighten, which could strip the threads of the filter or filter housing. Open the hood for access to the engine compartment. Unscrew the oil cap on the top of the engine. 4) Pour in three quarts of engine oil. Pull the engine oil dipstick out of the dipstick tube and wipe it clean. Push the dipstick back into the dipstick tube. Pull back out and look at the engine oil level. If the oil on the dipstick does not stop between the two marks on the dipstick, pour in a half quart of oil and check the level again. Do not overfill. 5) Start the car and allow it to run for few minutes. Turn the car off and check the oil level once again. Add another half quart of oil if necessary. Ensure the oil cap is back on the engine and the hood is closed. Hope this helps and if you need any parts for your sonata, this site looks like it has cheap prices, free shipping and great reviews http://www.buyautoparts.com/carmodels/Hyundai/Sonata.html
Go to a local auto parts satire and ask them to read the code to you if the code is over 999 then you will have to go to a dealer to review it. If your car hasn't seemed to change in overal performance it probably somthing really simple like a sensor or something!
BOTH High and low readings should be checked to have a better idea of what is going on with an AC system but based on the limited information… the compressor is not engaged or is not pumping. Below are some things I would check;
1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.
2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?
3. What is the outside temperature at the time the readings were taken? 4. Check to see if the condenser fan blowing strong?
5. Notice if compressor clutch is cylcling excessively. Could be overcharged, not enough air going across condenser fins, compressor not pumping sufficiently… BOTH gauge readings are really needed to get a better idea. Below are normal car AC pressure readings with 134A.
Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI
Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor
Thank you for using fixya and good luck, keep me posted. Be glad to help you get your A/C running again soon.
Jump in! 8mm, 10mm, 12mm, 14mm, 17mm. There is a hooking bracket on the head near the ps pump and a hooking bracket on the transmission. Loosen everything, unplug everything, drain coolant, pop axles out and lift them both out at the same time. If you're putting another motor in, try to get the same as yours according to external coil or internal coil on the distributor. 90 or 91 is easiest with your car. If not you'll be swapping your entire wiring harness. If you're putting an EX motor in an LX car (or other way around) you'll also need to change the header "o2 sensor is in a different spot", AC pump bracket and AC pump. I put a 93 EX in a 90 LX and it is fine! Extra work but runs great.
i am going to have to ask you to get someone to duplicate these conditions while they have a fuel pressure gauge hooked up to the car, sometimes fuel pumps only fail under these conditions and it sounds like it may be acting up,,,, please rate and have a great night -jeff
You may have computer sensor problems. Humidity and temperature of air affect fuel regulation controls in moden engines. Cool morning to hot afternoon and system still thinking it is cool thus engine has very poor performance. This vehicle has what is called a driveability issue and is ususally a bear to figure out without the proper scanning equipment.