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Autopapyrus · Skoda Yeti (1st generation)
https://autopapyrus.com/guides/skoda/yeti/heater-core-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Skoda Yeti (1st generation): Heater Core Replacement

The heater core is located in the HVAC housing behind the dashboard, on the firewall. The exact procedure for this model and engine is not fully documented in open sources. Below are the general order of work and key principles for the VAG platform; when disassembling, rely on the actual design of your vehicle. The 1.8 TSI engine (CDAA) affects the work sequence only through the layout of the hoses in the engine bay.

Difficulty: Hard Time: 4-8 hours (depending on access to the heater housing) Steps: 13 Tools: socket and wrench set, Torx set (T20-T30), flat and Phillips screwdrivers, plastic clip removal tools, hose clamps or pliers for spring clamps, coolant drain pan (6-8 L (6.3-8.5 qt)), compressed air, rags, marker and bags for fasteners

Part

  • 🔩 heater core for Skoda Yeti. Also: coolant of the correct type (G12/G12+ per VW specification, approx. 5-7 L (5.3-7.4 qt)), O-rings or hose seals as needed, and new trim clips if necessary
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes AutoFix (online). See manuals →

Step by step

13 steps
  1. Confirm the fault: fogged windows, a sweet coolant smell in the cabin, a wet carpet under the driver's and passenger's feet, coolant level dropping with no visible leaks, a cold heater with a warm engine. If the heater simply does not produce heat, first check for air in the system and the thermostat, and check for a clogged heater core by flushing it.
  2. Let the engine cool completely. Disconnect the negative battery terminal. If the car has a radio code, find it beforehand. The vehicle must sit level.
  3. Drain the coolant: remove the underbody shield, open the drain plug or disconnect the lower radiator hose, and drain the fluid into a pan. Drain with the expansion tank cap open. Dispose of the coolant properly, as it is toxic.
  4. In the engine bay, find the two heater pipes that run through the firewall to the heater core. Note their positions (supply and return), release the clips or clamps, and disconnect them. Blow the remaining coolant out into the pan with compressed air, or carefully through the hose into the pan, so you don't flood the cabin.
  5. Prepare access in the cabin. Remove the floor mat and the side trim panels on either side of the center console, the lower panels under the steering column and on the passenger side, the footwell air ducts, and the glove box. To reach the heater housing on this platform, you usually need to remove part or all of the dashboard together with the cross-car beam. Remove the airbags only after disconnecting the battery and waiting the time specified in the manual. Do not touch the SRS connectors unless necessary. If you have no experience working with the dashboard and airbags, it is better to leave this job to a repair shop.
  6. Photograph and label all harnesses and connectors. Put fasteners in labeled bags. Use proper Torx bits and plastic trim tools so you don't break the clips.
  7. Disconnect the harnesses, air ducts and flap linkages that prevent the housing from coming out. On cars with automatic climate control, carefully disconnect the flap actuators and sensors. Disassemble the heater housing: remove the cover over the heater core, which is held by plastic latches or screws.
  8. Remove the heater core together with its seals. Inspect the housing and remove debris and remnants of old foam. Fit the sealing gasket around the core and the pipe grommet onto the new heater core in the correct position, without twisting, because it prevents leaks into the cabin.
  9. Install the new heater core in reverse order. Compare it with the old one: the shape, the position of the pipe stubs and the dimensions must match. Do not overtighten the plastic housing parts.
  10. Reassemble the housing, dashboard, air ducts and trim. Make sure the airbags and connectors are plugged in and the wiring is not pinched.
  11. Connect the heater pipes to the heater core and make sure the clamps are in good condition; if in doubt, replace them with new ones. Fill with coolant up to the MAX mark. Tightening torques for the clamps and dashboard fasteners follow the manufacturer's specification; values are not given here.
  12. Bleeding the air: start the engine, set the heater to maximum temperature and medium fan speed, and hold the engine at 2000-2500 rpm until the thermostat opens. Watch the level in the tank and top it up. Squeeze the upper radiator hose until the flow is free of bubbles. An air pocket in the heater is a common cause of a cold heater after replacement.
  13. After 1-2 drives, check the coolant level with the engine cold, and check for leaks under the carpet and at the hoses on the firewall.

Common mistakes and warnings

  • This job is labor-intensive and involves removing dashboard parts near the airbag system, so if you lack experience, take it to a repair shop. Do not pour sealants into the system: they clog the heater core fins. Do not mix coolants of incompatible types. Work only on a cold engine, because a hot system is under pressure.
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