Heater Core

Complete heater core replacement requiring full dashboard removal, HVAC housing disassembly, and coolant system drainage on the 2017 Maserati Levante 3.0L V6 Twin Turbo.

Warnings

Tools required

Parts

• Heater core assembly × 1 — Use OEM Maserati specification
• HVAC housing gaskets and seals × 1 — Use OEM specification
• Dashboard mounting clips × 1 — Assorted replacement clips
• Heater hose O-rings × 2 — Use OEM specification
• Coolant expansion tank cap × 1 — Replace if over 3 years old

Fluids

• Maserati OAT Coolant — 10 qt

Preparation

1. Position vehicle on level surface and engage parking brake
2. Disconnect negative battery terminal and wait 15 minutes for airbag system discharge
3. Remove front seats completely to allow dashboard withdrawal clearance
4. Drain coolant system completely at radiator drain petcock and expansion tank
5. Document dashboard and center console wiring with photos before disconnection
6. Remove steering wheel using appropriate puller after disconnecting airbag
7. Set up dashboard support jig or padded stands to receive dashboard assembly

Procedure

1. 1

   Drain cooling system
   Place drain pan under radiator. Open radiator drain petcock and drain coolant into appropriate container. Remove coolant expansion tank cap to vent system. Drain expansion tank separately. Total system capacity is 10 quarts.
   Torque spec

   Drain Petcock7 Nm (5 lb-ft)
2. 2

   Remove center console and lower dash panels
   Remove gear selector trim panel by prying at rear edge. Disconnect electrical connectors for gear selector, drive mode switches, and heated seat controls. Remove center console mounting screws (4 front, 2 rear under armrest). Lift console up and back to clear gear selector. Remove lower dash panels on driver and passenger sides by releasing clips and removing screws at bottom edge.
   Torque spec

   Dashboard Screws3 Nm (2 lb-ft)
3. 3

   Disconnect instrument cluster and main harness
   Remove instrument cluster bezel by releasing upper clips. Remove cluster mounting screws and pull cluster forward. Disconnect three main connectors at rear of cluster. Locate main dashboard harness connectors behind center stack - disconnect climate control module (gray 24-pin), infotainment module (black 40-pin), and passenger airbag connector (yellow 2-pin). Tag all connections.
   ⚠Yellow airbag connectors have secondary locks that must be released before pulling connector body.
   Torque spec

   Dashboard Screws3 Nm (2 lb-ft)
4. 4

   Remove dashboard mounting bolts
   Locate and remove dashboard mounting bolts: 4 bolts along top edge under defrost grille, 2 bolts at each A-pillar base (access through side panels), 2 bolts at center support beam under glove box area, and 2 bolts at lower steering column support. Note that bolt lengths vary - upper bolts are shorter (40mm) than lower support bolts (60mm).
   Torque spec

   Dashboard Screws3 Nm (2 lb-ft)

   Mounting Bolts28 Nm (21 lb-ft)
5. 5

   Withdraw dashboard assembly
   With assistance, carefully pull dashboard straight back toward rear seats. Monitor for any remaining electrical connections or hidden fasteners. Lift dashboard slightly while pulling to clear steering column opening. Place dashboard on padded supports with display facing up to prevent screen damage. Cover with clean sheet to protect leather surfaces.
   ⚠Dashboard weighs approximately 80 lbs and requires two people for safe removal. Support center section to prevent flex and cracking.
6. 6

   Access and disconnect heater hoses
   From engine bay, locate heater hoses at firewall on passenger side near brake booster. Heater supply hose (upper) and return hose (lower) connect with spring clamps. Use heater hose clamp pliers to compress and slide clamps back. Twist hoses gently to break seal, then pull straight off firewall fittings. Allow residual coolant to drain into pan. Cap open fittings with plugs to prevent debris entry.
   ⚠Expect approximately 1 quart of coolant to drain from hoses. Have pan positioned under work area.
   Torque spec

   Heater Hose Clamps3 Nm (2 lb-ft)
7. 7

   Remove HVAC housing upper cover
   With dashboard removed, HVAC housing is fully visible. Remove cabin air filter access panel if not already removed. Disconnect blend door actuator connectors (2) and mode door actuator connector (1) on driver side of housing. Remove upper housing cover screws (8 total) around perimeter. Carefully lift upper cover straight up - it may be sealed with foam gasket material. Set aside and inspect foam seals for deterioration.
   Torque spec

   Cover Screws11 Nm (8 lb-ft)
8. 8

   Remove evaporator and blower assembly
   Disconnect blower motor connector on passenger side. Remove blower motor mounting screws and extract blower assembly. Remove evaporator mounting bracket bolts. Note AC line connections at firewall - these should NOT be disconnected for heater core service. Carefully lift evaporator housing section to access heater core below. Support evaporator to prevent stress on AC lines.
   ℹ️Do not disconnect AC refrigerant lines. Evaporator can be repositioned without refrigerant recovery if lines have adequate slack.
   Torque spec

   Fan Bolts11 Nm (8 lb-ft)

   Mounting Bolts28 Nm (21 lb-ft)
9. 9

   Extract failed heater core
   Heater core is now visible in lower housing section. Remove heater core mounting brackets (2 bolts each side). Note orientation of heater core inlet/outlet tubes facing firewall. Gently pull heater core straight up and out of housing. Inspect housing for debris, leaves, or foam deterioration. Clean housing thoroughly with vacuum before installing new core. Check housing drain tubes are clear.
   Torque spec

   Heater Core Mounting8 Nm (6 lb-ft)
10. 10

    Install new heater core
    Verify new heater core matches original inlet/outlet orientation. Install new O-rings on heater core tubes with light coating of coolant for lubrication. Lower heater core into housing, aligning tubes with firewall passages. Install mounting brackets and torque mounting bolts evenly in cross pattern. Verify heater core sits flush in housing with no gaps in foam seals.
    ℹ️Heater core tubes must align perfectly with firewall passages. Do not force - verify O-rings are not pinched or displaced.
    Torque spec

    Heater Core Mounting8 Nm (6 lb-ft)
11. 11

    Reassemble HVAC housing
    Reposition evaporator assembly and secure with mounting bolts. Reinstall blower motor assembly and connect electrical connector. Install upper housing cover with new foam seal if original is deteriorated. Install cover screws in star pattern, torquing evenly to avoid housing distortion. Reconnect all actuator connectors and verify actuator movement by hand before reinstalling dashboard.
    Torque spec

    Cover Screws11 Nm (8 lb-ft)

    Fan Bolts11 Nm (8 lb-ft)

    Mounting Bolts28 Nm (21 lb-ft)
12. 12

    Connect heater hoses at firewall
    From engine bay, install new O-rings on firewall heater core fittings. Push heater hoses firmly onto fittings until seated against shoulder. Install spring clamps in original positions or replace with new worm-drive clamps. Torque hose clamps if using worm-drive style. Verify hoses are fully seated and clamps are positioned over barbed section of fitting.
    Torque spec

    Heater Hose Clamps3 Nm (2 lb-ft)
13. 13

    Reinstall dashboard assembly
    With assistance, position dashboard over HVAC housing and steering column. Guide dashboard into position while feeding wiring harnesses through openings. Align dashboard mounting holes with body studs and HVAC housing. Install all mounting bolts hand-tight first, then torque in sequence: center support bolts first, then A-pillar bolts, then upper edge bolts. Reconnect all electrical connectors using photos as reference.
    Torque spec

    Dashboard Screws3 Nm (2 lb-ft)

    Mounting Bolts28 Nm (21 lb-ft)
14. 14

    Refill and bleed cooling system
    Close radiator drain petcock. Fill coolant system at expansion tank with Maserati OAT coolant mixed to specification. Start engine and allow to reach operating temperature with heater set to maximum temperature and fan on low. Monitor coolant level and add as system burps air. Use vacuum fill tool if available for faster air removal. When thermostat opens, check for consistent hot air from vents and verify coolant level stabilizes.
    ⚠Monitor engine temperature closely during bleeding process. Twin turbo engines are sensitive to air pockets that can cause localized overheating.
    Torque spec

    Drain Petcock7 Nm (5 lb-ft)
15. 15

    Perform system verification
    Connect Maserati diagnostic scanner and clear any fault codes generated during repair. Perform climate control system calibration procedure through scanner (actuator relearn). Test all HVAC modes (defrost, floor, panel, mixed) and verify proper airflow. Test temperature blend from full cold to full hot in all modes. Check heater hose connections at firewall for leaks. Reinstall front seats and remaining trim panels.
    ℹ️Climate control actuator calibration is mandatory after dashboard removal. System will not function properly without relearn procedure.

Reassembly

1. Install all dashboard components in reverse order of removal, verifying all electrical connectors are fully seated with audible clicks
2. Torque all fasteners to specification using cross-pattern on multi-bolt components
3. Verify all trim panels and clips are properly seated before testing system operation
4. Perform complete climate control function test in all modes before returning vehicle to service

Verification

• Start engine and verify no coolant leaks at heater hoses, expansion tank, or radiator drain
• Confirm hot air output at maximum heat setting reaches minimum 120°F at center vents within 10 minutes of cold start
• Verify no coolant smell in cabin during heater operation
• Check coolant level after three heat cycles and top off if needed - initial fill may not capture all air
• Scan for fault codes and verify no climate control or airbag system codes present
• Test all dashboard functions including instrument cluster, infotainment, and climate controls
• Verify passenger airbag indicator illuminates properly during startup self-test

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