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Autopapyrus · Geely Cityray 1.5 Turbo (2024)
https://autopapyrus.com/guides/geely/cityray/thermostat-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Geely Cityray 1.5 Turbo (2024): Thermostat Replacement

The thermostat on the 1.5 turbo engine controls warm-up and coolant temperature. Typical signs of failure: slow warm-up, overheating, a cold heater on the highway, and a hot upper hose while the engine is cold. The exact procedure for this model is not documented in publicly available service materials, so the general principle is given below. Check tightening torques and the housing location against the manufacturer's service manual.

Difficulty: Medium Time: 2-3 hours Steps: 10 Tools: Socket set and ratchet (mostly 8-13 mm), extensions, screwdriver or pliers for hose clamps, coolant drain pan (6 L (1.6 gal) or larger), funnel, rags, torque wrench, pit or lift (for access to the engine undertray)

Part

  • 🔩 Thermostat assembly with housing (on this engine the thermostat usually comes as a single unit with the housing and may be electronically controlled) and a housing O-ring or gasket. You will also need coolant of the same type and specification as what is in the system, about 5-7 L (5.3-7.4 qt), including a reserve

Step by step

10 steps
  1. Let the engine cool down completely. Never open a hot, pressurized cooling system. Park the car on a level surface and disconnect the negative battery terminal.
  2. Remove the engine undertray and plastic decorative covers. If necessary, remove the air duct or turbocharger pipe if it blocks access to the thermostat housing.
  3. Locate the thermostat housing. It is usually where the lower radiator hose and the other cooling system hoses connect to the engine. If the thermostat has an electrical control connector, mark it and disconnect it.
  4. Place the drain pan under the car and drain the coolant through the radiator drain plug. If there is no plug, loosen the lower hose. Drain at least part of the coolant so there is no large spill during removal.
  5. Loosen the clamps and remove the hoses from the housing. Remember the position of each hose, and take a photo if needed.
  6. Remove the housing mounting bolts and take off the housing together with the thermostat. Watch for residual coolant.
  7. Clean the mounting surface of dirt and old sealant without leaving scratches. Inspect the hoses: cracks, swelling or softening of the rubber mean they need to be replaced.
  8. Install the new thermostat with a new seal. Tighten the bolts evenly in a crisscross pattern. The torque for these bolts is usually low, about 8-12 N·m (6-9 lb-ft); confirm the exact value in the manufacturer's service manual. Connect the connector, fit the hoses and tighten the clamps.
  9. Close the drain opening and fill with coolant to the correct level. Turn the heater to maximum, start the engine and let it run with the expansion tank cap open. Top up the coolant as air escapes. Rev the engine slightly from time to time.
  10. Warm the engine up to operating temperature. Make sure the fan switches on and both the upper and lower radiator hoses become hot. Check the connections for leaks. After the engine cools down, check the coolant level and top up if needed. Reinstall the undertray.

Common mistakes and warnings

  • Never open the tank cap or hoses on a hot engine, as you can be burned. An air pocket in the cooling system of a turbo engine can cause local overheating, so bleed the air thoroughly. If the temperature keeps climbing after the replacement or the overheating warning light comes on, shut the engine off immediately. If the thermostat is electronically controlled and cooling system errors appear after replacement, a scan tool diagnosis will be needed. If you have no experience working on cooling systems, leave the replacement to a repair shop.
How it works · 3D How the Engine Cooling System Works How the part you're working on actually works — in plain English, on a 3D model. Open in 3D →