Is your 2017-2019 Honda Civic’s air conditioning not blowing as cold as it used to? You might be wondering how to get that refreshing chill back. This guide will explain exactly how do I recharge my 2017-2019 AC Honda Civic safely and effectively.
Recharging your car’s AC system, also known as topping up the refrigerant, is a common maintenance task. For these specific Civic model years, the process is straightforward if your system is just low on refrigerant. However, it’s crucial to understand what you’re doing and why the refrigerant might be low in the first place.
How Do I Recharge My 2017-2019 AC Honda Civic
Before you start, a critical warning: The AC system is sealed. Refrigerant doesn’t get “used up.” If it’s low, there is a leak. Simply recharging a leaking system is a temporary fix and can be wasteful or even damaging if done incorrectly. This guide is for topping up a system that is slightly low, not for fixing a major leak.
What You’ll Need to Get Started
Gathering the right tools and safety gear is your first step. Here’s what you’ll need:
* AC Recharge Kit: Purchase a kit designed for R-1234yf refrigerant. This is the only type of refrigerant used in your 2017-2019 Honda Civic. Using the older R-134a is dangerous, illegal, and will damage the system. The kit should include a gauge and hose.
* Safety Glasses: Protect your eyes. Refrigerant can freeze skin and eyes on contact.
* Gloves: Chemical-resistant gloves are a good idea.
* Car Manual: Have your owner’s manual handy for specific details.
* Thermometer: A simple digital thermometer to measure vent temperature.
Locating the Service Ports on Your Civic
Your Civic has two different AC service ports. It’s vital you use the correct one for recharging.
* Low-Pressure Service Port: This is the only port you use for DIY recharge kits. It’s located on the larger diameter aluminum tubing of the AC system, usually near the firewall on the passenger side. The cap will typically have an “L” on it.
* High-Pressure Service Port: This port is for professional equipment only. It is on the smaller diameter tubing and has an “H” on the cap. Never attach your DIY kit to the high-pressure port.
The low-pressure port has a different, smaller fitting than the high-pressure port to prevent this mistake. Your recharge kit hose should only connect to the low-side port.
Step-by-Step Guide to Recharging Your AC
Now, let’s walk through the process step by step. Work in a well-ventilated area and never smoke near refrigerant.
Step 1: Initial System Check
First, you need to confirm the AC system is working and just low on charge. Start your car’s engine and turn the AC to its maximum setting. Set the fan to the highest speed and make sure the recirculation button is on. Let the system run for 5-10 minutes to stabilize.
Step 2: Connect the Recharge Gauge
With the engine and AC still running, put on your safety glasses and gloves. Find the low-pressure service port and remove its protective cap. Shake the refrigerant can as directed on the label. Attach the hose from your recharge kit to the can, but do not screw it on tightly yet. Open the valve on the hose for a second to purge air from the hose, then close it. Now, connect the quick-connect fitting on the hose to the low-pressure port on your car. It should snap on securely.
Step 3: Read the Pressure Gauge
Observe the pressure reading on the gauge. Compare it to the chart that came with your kit, which correlates pressure with ambient air temperature. Do not use the “color zone” gauge; use the actual PSI reading.
* If the pressure is in the normal range (usually indicated by a green zone or specific PSI), your system charge is likely okay, and the problem is elsewhere.
* If the pressure is low, you can proceed with adding refrigerant.
Step 4: Adding Refrigerant
This step requires patience. Hold the can upright. Open the valve on the hose to allow refrigerant to flow into the system. Do not shake the can while it’s connected. Every 30 seconds or so, close the valve and check the pressure gauge. You may need to gently rock the can (not shake) as it empties.
Crucial Tip: Never overcharge the system. Overcharging can cause worse cooling performance and damage the compressor. Add refrigerant slowly, in short bursts, checking the pressure frequently. Stop when the pressure reaches the normal range for the current outside temperature.
Step 5: Monitor Vent Temperature
While adding refrigerant, place a thermometer in the center air vent. You should see the temperature begin to drop. A properly functioning Civic AC should blow air around 35-45°F at the vents on a warm day.
Step 6: Disconnect and Final Check
Once the pressure is correct, close the valve on the hose. Disconnect the quick-connect fitting from the car’s service port. Quickly replace the protective cap on the port. Let the AC run for a few more minutes and confirm the cold air is consistent. Check for any obvious signs of oil or dye around the service ports, which indicate a leak.
When to Call a Professional
DIY recharging is a stopgap. You should seek a professional mechanic if:
* The pressure gauge shows no reading or an extremely high reading initially.
* The clutch on the AC compressor (the front part of the pulley) is not engaging when the AC is on.
* You see significant oil or fluorescent dye (from a previous repair) around any AC components.
* The system cools only briefly after recharging, meaning there is a significant leak.
* You are uncomfortable with any step of this process. AC repair requires certification to handle refrigerant legally for major repairs.
Maintaining Your Civic’s AC System
To keep your AC running cold, use it regularly. Run the AC for at least 5-10 minutes once a week, even in winter. This circulates the refrigerant and oil, keeping seals lubricated. Also, run the fan on high occasionally to help keep the evaporator drain clear and prevent musty odors.
A well-maintained AC system is more efficient and reliable. If you find yourself recharging every year, the leak should be found and repaired by a qualified technician.
Frequently Asked Questions (FAQ)
Q: Can I use R-134a in my 2019 Civic?
A: Absolutely not. Your 2017-2019 Civic requires R-1234yf refrigerant. Using R-134a will not work, can cause system failure, and is illegal due to environmental regulations.
Q: How often should I need to recharge my Honda Civic AC?
A: You should rarely, if ever, need to recharge it. The system is sealed. Needing a recharge indicates a leak that should be fixed.
Q: What if my AC compressor isn’t turning on?
A: A recharge won’t help. This could be due to a electrical issue, a faulty compressor clutch, or a critically low refrigerant level that triggers a low-pressure switch. This requires professional diagnosis.
Q: Is it safe to use those AC recharge kits with sealer?
A: It is not recommended. Sealers can clog the entire AC system, including the expensive compressor and expansion valve, leading to very costly repairs. They often void warranty coverage too.
Q: How cold should the air be from my vents?
A: On a 70-80°F day, you should expect a vent temperature between 35°F and 45°F. A larger temperature drop from the outside air indicates a problem.
Recharging the AC in your 2017-2019 Honda Civic is a manageable task if you follow the steps carefully, use the correct refrigerant, and understand the limits of a DIY approach. Always prioritize safety and know when a problem is beyond a simple top-up. Addressing leaks promptly will ensure your Civic’s cabin stays comfortably cool for many miles ahead.