Van Heater Blowing Cold: Matrix, Air Locks and Blend Faults
by A heater blowing cold is often the first sign of a cooling system problem rather than a heater problem. How to tell which, and what a sweet smell means.
Author: Bilal | Vans Guru
Writer & Editor at Vans Guru.
Bilal writes and edits Vans Guru. He researches and develops the technical guides published on this site, drawing on manufacturer and workshop technical literature, established repair references, and patterns reported by people who actually work on these vans. Vans Guru is a research-led information website, not a garage: Bilal doesn't carry out repairs or inspect readers' vehicles, and these guides aren't a substitute for a qualified technician diagnosing the van in front of them. Spotted something that needs correcting? Get in touch through the Contact Us page.
ULEZ, Clean Air Zones and What They Mean for Van Owners
Emissions zones charge by Euro standard, not by age, and the rules differ between cities. How to check your van and why a DPF delete is a serious problem here.
Exhaust Leaks and Flexi Pipe Failure on a Van
A blowing exhaust is not just noise. A leak before a sensor causes running faults, and on a panel van fumes can reach the cab. Where they fail and why.
Catalytic Converter Faults on a Van
A failed catalyst is almost always a symptom of something upstream. Why finding that cause matters, plus the theft problem vans face.
NOx Sensor Faults on a Diesel Van
NOx sensors are among the most expensive sensors on a van and among the most speculatively replaced. How to confirm the fault before spending.
Diesel Engine Knock and Rattle: What Is Normal and What Is Not
Diesels clatter by nature, which makes it hard to know when a noise matters. How to place a knock by timing and behaviour, and which ones mean stop driving.
Auxiliary Belt and Tensioner Faults on a Van
One belt drives the alternator, water pump, steering and air con. When it fails you can lose several systems at once, which is why noises here matter.
Diesel Van Cold Start Problems: A Structured Approach
A van that starts fine when warm and struggles from cold is telling you something specific. How to work through the causes in the right order.
Engine Mount Failure on a Van: Vibration, Clunks and Movement
Worn mounts produce clunks and vibration that get blamed on driveshafts, clutches and flywheels. How to check them properly in a few minutes.
Crankcase Breather and PCV Faults on a Diesel Van
One of the cheapest components on the engine, and one of the most commonly missed causes of oil leaks and blue smoke. Why the breather is worth checking first.