Parts for your 2018 Haval H6-Temperature sensors

2018 Haval H6 temperature-sensors — what they do and how to look after them

Temperature sensors are absolutely fitted to the 2018 Haval H6 and they matter a lot. Factory service information for the 2017–2018 H6 range from Great Wall Motors (Haval) and common industry data sets such as Autodata, plus standard OBD-II/SAE J2012 diagnostic listings (P0115–P0119 for coolant, P0110–P0114 for intake air) all reference the vehicle’s engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor, ambient temperature and A/C evaporator sensors, and transmission fluid temperature inputs. In short, this H6 relies on multiple temperature signals for fuelling, ignition timing, fan control, air‑con performance and dashboard readings.

On the H6, the ECT sensor is the star player. It tells the engine computer how warm the engine is so it can manage cold starts, idle speed, mixture, and kick the radiator fans in when needed. The IAT sensor helps trim fuelling as the weather swings from a frosty morning to a scorching arvo. Climate control needs ambient and evaporator temperature sensors to keep the cabin comfy without freezing the evaporator. Where fitted, the transmission control also watches fluid temperature to protect the gearbox and smooth out shifts.

These sensors aren’t usually a scheduled replacement item, but they deserve a look during routine servicing. A technician will typically:

• Inspect connectors and wiring for corrosion, oil wicking or brittle insulation.
• Check live data with a scan tool — ECT and IAT should read close to ambient when stone cold, then rise smoothly with warm‑up.
• Verify cooling system health (coolant quality, correct thermostat, no airlocks) because poor cooling can mimic a bad sensor.

If replacement is needed, it’s a straightforward job on most H6 variants. Allow the engine to cool fully, safely relieve any cooling system pressure, and catch coolant. Fit a quality OEM‑equivalent sensor with the correct seal, avoid thread tape unless specified by service info, and torque to spec from the workshop manual. Refill with the correct coolant mix, bleed the system properly, clear any fault codes and confirm that fan operation and temperature readings behave as expected on a road test. Using scan‑tool data to compare ECT against infrared thermometer readings is a tidy way to double‑check everything’s on song.

FAQs

Where is the engine coolant temperature sensor on a 2018 Haval H6?
It’s typically threaded into the thermostat housing or near the cylinder head coolant outlet, close to the upper radiator hose. On many H6 variants it’s reachable from the top of the engine bay. Following the two‑wire connector that runs to the housing is a handy way to spot it.

What are the signs of a failing temperature sensor on the H6?
Common clues include hard cold starts, high or hunting idle, poor fuel economy, black smoke on start‑up, cooling fans running constantly or not at all, a misreading temperature gauge, and engine codes like P0115–P0119 (ECT) or P0110–P0114 (IAT). A proper scan and a quick wiring check help confirm the fault.

Does a new temperature sensor need coding on a 2018 H6?
Generally no. The engine computer will read the new sensor without special coding. After fitting, bleed the cooling system if the ECT was replaced, clear any stored fault codes, and verify stable readings and fan operation with a scan tool. Some workshops also run a brief fan test via the tool as a belt‑and‑braces check.