Diagnostic Case Study

No Cold Air — I-Pace A/C Compressor Pipe Leak

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A Jaguar I-Pace came in with the A/C blowing warm instead of cold. Refrigerant investigation traced it to a leak on the A/C compressor inlet and/or outlet pipes — a known issue covered by JLR Technical Bulletin JLRTB02109NAS1.

The Challenge

"A/C not cold" on an EV can point at half a dozen systems — refrigerant charge, compressor, condenser, or (on the I-Pace) the shared battery-chiller loop. Here the fault traced to something much simpler and more specific: a leak at the compressor's own inlet/outlet pipe unions, caused by low weld quality on early-build pipes.

The bulletin's fix has a trap for anyone working from habit rather than the document — even if only one pipe is found leaking, both the High Pressure and Low Pressure pipes must be renewed as a pair. Fitting only the leaking one leaves a second weld of the same low quality in the system, inviting a comeback.

Structuring the Diagnostic

By adopting a structured and documented approach, the workshop used the EvmetricsOBD Workshop Templates to guide the diagnostic process. These templates lead the technician through a strict hierarchy of tests, ruling out causes logically and preventing expensive misdiagnoses.

JLRTB02109NAS1 — A/C Compressor Pipe Leak (I-Pace)

A/C blows warm, compressor inlet/outlet pipes found leaking — renew both HP and LP pipes as a pair, per JLR Technical Bulletin JLRTB02109NAS1
  • Confirm A/C inoperative & leak-check compressor pipes
    A/C not blowing cold, confirmed inoperative. Leak-check the A/C compressor inlet (LP) and outlet (HP) pipe unions before condemning the compressor itself.
  • Root cause: low weld quality
    Per JLRTB02109NAS1, low weld quality on early-build A/C pipes is the cause. New-level service pipes are available to correct it.
  • Renew both pipes as a pair
    Even if only one pipe is found leaking, both the HP pipe (T4K19677) and LP pipe (T4K19719) must be renewed together — do not fit one and leave the other.
  • Recover A/C refrigerant
    Recover the refrigerant per Climate Control System General Procedures (Recovery, Evacuation and Charging) before any disassembly.
  • Remove front EDU for access
    The Front Electric Drive Unit is removed for access only, not because it is faulty — refit as normal on reassembly.
  • Clear brackets & reposition harness
    Remove the pipe-bracket cover, reposition the High Voltage (HV) harness clear of its bracket, and reposition the indirect condenser clear of its bracket.
  • Disconnect sensor connectors
    Disconnect the A/C HP temperature sensor and the A/C temperature/pressure sensor electrical connectors before removing the pipes.
  • Disconnect pipes at compressor & accumulator
    Remove the HP pipe from the compressor and the LP inlet pipe from the accumulator. Retain the new seal (J9D1169) for reassembly — a new O-ring is required at every union disturbed.
  • Install new pipes & O-rings
    Fit the new HP/LP pipe pair with new O-rings throughout, reversing the removal sequence.
  • Evacuate, recharge & leak-check
    Evacuate and charge the A/C system per Climate Control General Procedures, then confirm no further leak at the renewed unions.
  • Gate: front wheel alignment only
    Subframe-to-body and front lower arm fasteners are disturbed for EDU access — check and correct front wheel alignment. Rear alignment, if out of spec, is a separate job with its own toe-link locking nuts — not part of this bulletin.
The Outcome Following JLRTB02109NAS1, both the HP and LP compressor pipes were renewed as a pair rather than just the one found leaking, the system was evacuated and recharged, and front wheel alignment was checked and corrected after the subframe/suspension fasteners were disturbed for EDU access. The A/C blows cold again with no comeback risk from the second, as-yet-unfailed weld.