What to Do When the Car AC Has Normal Low Pressure but Low High Pressure?
4 Answers
When a motor vehicle's air conditioning system shows normal low pressure but low high pressure, it is typically caused by a malfunctioning AC compressor. In such cases, the AC compressor needs to be inspected and repaired. If repair is not possible, replacement is necessary. After replacing the compressor, refrigerant must be replenished before the system can be used. Relevant information about the intercooler is as follows: 1. Introduction: The intercooler is essentially a supporting component for turbocharging and is generally only found in vehicles equipped with a turbocharger. 2. Function: Its role is to reduce the temperature of the compressed air, thereby lowering the engine's thermal load, increasing air intake, and consequently boosting the engine's power.
I just encountered this issue where the low pressure is normal but the high pressure is low, resulting in poor cooling performance. After checking, it might be due to a clogged expansion valve or reduced compressor efficiency. You'd better first confirm the system pressure with a pressure gauge. If the high pressure is below around 200 psi, then you should consider the expansion valve issue. This valve controls the refrigerant flow—if it's clogged, the high pressure won't rise. Cleaning the condenser dust yourself might help, but if it doesn’t work, head to the repair shop to replace the valve core. Remember to maintain your AC regularly to avoid dust buildup or refrigerant leaks. Last time I delayed the repair for a few days, the compressor almost got damaged, and fixing it cost me more money. In short, handling it early saves trouble.
I've encountered this issue a few times. When the AC high pressure is low while the low pressure remains normal, it can be quite frustrating. It might be due to a dirty or clogged condenser, causing poor heat dissipation and resulting in the high pressure dropping. Insufficient refrigerant charge can also cause this, but since the low pressure is normal, it's not a quantity issue. You can start by cleaning the condenser fins at the front of the car—rinse off any leaves or dirt with water to see if it improves. If that doesn't help, there might be a problem with the expansion valve or compressor, and you'll need to take it to a professional shop for inspection. After my car was repaired, the AC worked perfectly again. I suggest not delaying the repair, as prolonged neglect could lead to compressor burnout, which is both troublesome and expensive to replace. Driving safely in summer is crucial, and timely inspection is key.
Low high pressure in the AC system with normal low pressure usually indicates an expansion valve or cooling issue. First, check if the condenser is clean using simple methods - dust blockage can affect pressure. If cleaning doesn't help, the expansion valve likely needs replacement. It's quicker to have it fixed at a repair shop to prevent excessive compressor wear. With over a decade of driving experience, I can say this is a common fault that's fine once repaired. Don't forget regular checks of refrigerant and cooling systems.
