Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Heater And A/C Unit, Removing And Installing: Installing
Install in the reverse order of removal while noting the following:
-- Pay attention to the correct seating of the seal -1- in the groove -arrow- of the corresponding refrigerant line.
-- Coat the new seals with refrigerant oil before installing the refrigerant lines.
There is a risk of damaging the A/C compressor if the refrigerant circuit is empty.
- Never start the engine with the refrigerant circuit empty.
Vehicles with Refrigerant R134a
-- Fill the refrigerant circuit. Refer to the appropriate service information .
-- Perform the leak test on the refrigerant circuit line connections that were closed again. Refer to the appropriate service information .
Vehicles with Refrigerant R1234yf
-- Charge the refrigerant circuit. Refer to REFRIGERANT CIRCUIT, CHARGING .
-- Perform the leak test on the closed line connections of the refrigerant circuit. Refer to LEAKS, FINDING .
Continuation for All Vehicles
-- Fill the coolant. Refer to [For engine(s) DCGA, DTFA] Coolant, Draining And Filling / [For engine(s) CDVC] Coolant, Draining And Filling .
-- Start the A/C system after charging the refrigerant circuit. Refer to A/C SYSTEM, STARTING AFTER CHARGING REFRIGERANT CIRCUIT .
-- Check the heater and A/C unit function.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.