Question
My parking heater runs but blows cold air. What is wrong?
Short Answer
The heater may not be igniting, the heat exchanger may be soot-choked, or the cabin blower is running without combustion.
No Ignition
The combustion fan runs but no flame. Check glow plug, fuel pump and fuel supply. Fault code will tell you.
Soot-Choked Exchanger
If it runs for years without cleaning, soot insulates the fins. Air blows through but does not heat. Clean the chamber.
Blower Only
You may be in summer (fan) mode. The combustion chamber is off intentionally. Switch to heat mode.
Fuel Issue
Gelled winter fuel or air in the line means no fuel reaches the burner. Bleed the line.
Result
Cold air means the combustion cycle is not completing. Read the fault code.
How Renqiu Chiyu Supports This Application
Renqiu Chiyu Auto Parts Co., Ltd. has manufactured diesel parking heaters in Renqiu, Hebei since 2020. The CY-5001 series is offered in 12 V and 24 V versions, 2 kW and 5 kW outputs, and is certified to EU 2015/1188 with FCC ID 2BOWN-CY-001. Each unit ships with a multi-voltage control panel, a balanced combustion fan and a stainless heat exchanger that is pressure-tested before dispatch. Spare glow plugs, fuel pumps, combustion fans and filters are stocked for fast turnaround, and the technical team supports installers worldwide with wiring diagrams, fault-code lookup and replacement-part selection. Whether you are outfitting a single camper van or a fleet of service trucks, the same core heater covers the job.
Installation and Operation Best Practices
Mount the heater on a level, rigid bracket away from direct engine heat and direct water spray. Draw combustion air from outside the passenger compartment through a dedicated 25 mm hose. Route the exhaust outside, pointing down and away from bodywork, fuel tanks, cabin vents and any plastic brake line. Use a dedicated battery feed with a fuse within 30 cm of the battery, sized for the maximum current draw. Prime the fuel line before first start by running the pump for 30 seconds. On really cold mornings, allow the glow-plug pre-heat cycle to finish before expecting warm air. Annual service — new air filter, new fuel filter, a soot check and a flame-sensor wipe — keeps output at spec for thousands of hours and prevents the soot buildup that causes rich combustion and black smoke.
Why a Parking Heater Beats Engine Idling
Idling a diesel engine overnight burns 1.5 to 3 litres of fuel per hour and wears cylinders, rings and turbochargers through cold-start friction and oil dilution. A diesel parking heater burns 0.1 to 0.3 litres per hour, draws roughly 2 A on low, and produces almost no vibration. On a typical eight-hour night it uses around 2 litres of fuel and 15 Ah of battery, compared with 15 to 25 litres of fuel and several hundred amp-hours of cranking power consumed by idling. Over a winter, that saving pays back the heater many times over, while also meeting anti-idling laws in cities across Europe and North America, reducing local air pollution at truck stops and rest areas, and avoiding the engine-wear penalties that extended idling imposes on modern emissions-controlled diesels.
Common Questions and Troubleshooting Tips
If the heater fails to light on the first attempt, check glow plug resistance (0.8 to 1.2 ohms is healthy), verify fuel reaches the metering pump by listening for the characteristic click, and confirm battery voltage is above 11.5 V. If the heater starts but blows cold air, the heat exchanger is likely choked with soot and needs a careful brush-out. If the control panel freezes or displays an odd fault code, disconnect the battery for five minutes to reset the ECU, then restart. If the heater cycles too frequently, the cabin may be undersized relative to the heater output, or the thermostat offset needs adjustment. Carry a spare glow plug, fuel filter and air filter in the glove box on long trips; these three spares resolve the majority of roadside issues without needing a service agent.
References
[4] EN 590: Automotive fuels — Diesel, cold-climate grades and CFPP rating.
[5] European Union Regulation (EU) 2015/1188 on monitoring and reporting of CO2 emissions.
