Heater Core Replacement

Heater core replacement for a leaking or blocked core: steamed windscreen, sweet smell, damp carpet or no cabin heat.

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Service Info

Typical Duration 6 hours

We confirm the core is leaking or blocked rather than a valve or airlock problem, remove the dashboard as required, replace the heater core along with its hoses and control valve, flush the cooling system, refill and bleed, then verify heater output and check for leaks.

Skip the garage, our master mechanics come to you

At your home or office
Fair & transparent pricing
6-month, 6000km warranty

The Most Trusted Heater Core Replacement

The heater core is a small radiator buried in the dashboard that takes heat from the engine coolant and gives it to the cabin. When it blocks you lose cabin heat and your demister with it. When it leaks, hot coolant ends up in the footwell, the windscreen fogs with an oily film that will not wipe clear, and the car smells sweet. Michanic replaces heater cores, a job that on most vehicles means removing a substantial part of the dashboard.

Why Choose Our Heater Core Replacement Services?

  1. Diagnosis Before Dismantling:
    Removing a dashboard is serious work. We confirm the core is genuinely at fault rather than a valve, a blend actuator, air in the system or old coolant.
  2. Flushing Tried First:
    A core blocked with sludge can sometimes be flushed clear. If that will work we try it before quoting the larger job.
  3. Coolant System Addressed:
    Cores block because coolant was neglected. Replacing the core without flushing the system means the new one silts up as well.
  4. Reassembled Properly:
    Dashboards go back without rattles, with every clip and connector refitted, which is not a given on a rushed job.

Why We are the Best Choice for Heater Core Replacement

  • Realistic About Scope:
    You are told up front what this job involves and how long it takes, rather than discovering it once the dashboard is out.
  • Hoses and Valve Renewed:
    The pipework and the control valve feeding the core are the same age. Replacing them while access is open avoids repeating the work.
  • System Bled Thoroughly:
    The core sits at the highest point of the circuit, so it must be bled fully or the new one appears not to work.
  • Cabin Protected:
    Coolant in a footwell soaks the carpet and underlay. We deal with the residue rather than covering it over.

A leaking heater core is a safety problem before it is a comfort one. Coolant vapour condenses on the inside of the windscreen as an oily film that wipers cannot clear and demisting makes worse, so visibility deteriorates exactly when you need it. The coolant itself is toxic and ends up soaking the carpet and underlay in the footwell, where it stays. The car is also losing coolant into the cabin rather than onto the road, which means the level drops with no puddle to warn you, and overheating follows.

Frequently Asked Questions

  • What are the signs of a leaking heater core?
    A sweet smell inside the car, an oily film on the inside of the windscreen that will not wipe clear, damp or wet carpet in the passenger footwell, and coolant disappearing with no puddle under the vehicle.
  • Can a heater core be flushed instead of replaced?
    If it is blocked with sludge rather than leaking, flushing sometimes restores flow and is always worth attempting first. A core that is corroded through and leaking cannot be repaired and has to be replaced.
  • Why is heater core replacement expensive?
    The part itself is modest. The cost is access: on most vehicles the dashboard has to be removed, which means disconnecting the airbag system, the wiring loom and the air conditioning ducting, then reassembling everything correctly.
  • Can I drive with a leaking heater core?
    It is not advisable. Visibility is compromised by the film on the windscreen, the cabin is contaminated with coolant, and the engine is losing coolant steadily, which risks overheating without any obvious external leak.
  • What causes a heater core to fail?
    Corrosion from old coolant whose inhibitors are depleted, and blockage from the debris that same degraded coolant produces. Neglected coolant changes are the single most common cause, which is why the system is flushed as part of the repair.