Heating core leaks are usually indicated by coolant smell in the cabin, windows fogging heavily (oily film), or carpets getting wet in the front floor areas.

Yes. The core is buried deep in the dashboard cavities, and reaching it requires disassembling almost the entire center console and partially the dashboard. Budget at least one full day for the job.

Socket set: 6, 7, 10, 12 and 13 mm sockets (including long extensions). Torx set: Most dashboard screws have Torx heads (T25/T30). Screwdrivers: Philips and flat-head in various sizes. Small drill or saw: If you decide to cut the rear floor air ducts to save time.

Center console removal Remove the center console rear section (screws under the storage box base and under the handbrake handle). Disconnect the gear shift surroundings plastics and seat heater connectors. Slide the entire console backward or lift it completely out of the car. 2. Glove box and floor areas Remove the driver's floor protection plastic (Torx screws and clips). Remove the glove box completely (screws under the lid and 13 mm nuts underneath). Remove the ashtray, radio and cigarette lighter frame (screws under plastic covers). 3. Temperature controls and supports Remove the temperature control protective plastic and the control panel itself (4 Torx screws). Remove the front center console mounting screws (2 per side). Important: Remove the metal support rail between the gear shift and fuse box to make room to move the heating unit case. 4. Core and air ducts Air ducts: Plastic ducts leading to the rear floor areas route awkwardly. Option A: Remove both front seats and disassemble the ducts cleanly. Option B: Cut the ducts at a convenient point and tape them back together during reinstallation (common DIY "shortcut"). Engine bay: Disconnect the heating core hoses from the firewall opening. Be prepared to catch leaking coolant in a container. 5. Core removal Once all obstructions are gone, the heating unit case cover is opened and the core can be slid out. Be careful not to twist the plastic ears or damage the vacuum hoses.

Labeling: Mark all electrical connectors and screws you remove (e.g. in minigrip bags) so you know where everything goes 8 hours later. Seals: Check that the new core comes with seals. If not, use new foam for the opening so engine smell and water don't get inside. Core quality: Don't buy the cheapest core on the market – you don't want to do this job again a month later due to a leak. Prefer brands like Nissens, Hella or Behr.