Cooling System Pressure Test

Mobile cooling system pressure test at your home or office, to find where coolant is escaping when nothing is visible.

Book Your
Car Service

icon-whatsapp

Pricing

Pricing varies based on your vehicle

Get a Quote

Service Info

Typical Duration 1 hour

We pressurise the cold cooling system to its rated pressure and monitor for loss, test the pressure cap separately, inspect all accessible components under pressure, and where no external leak is found carry out a combustion gas test.

Skip the garage, our master mechanics come to you

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

The Most Trusted Mobile Cooling System Pressure Test

Coolant disappearing with no puddle is one of the most common and most misdiagnosed complaints. The system operates under pressure and at temperature, so a leak that only opens under those conditions is completely invisible when the engine is cold and standing. A pressure test recreates those conditions without running the engine. Michanic pressure tests cooling systems at your home or office.

Why Choose Our Mobile Cooling System Pressure Test Services?

  1. Finds Invisible Leaks:
    A leak that only appears under pressure cannot be found by looking. Pressurising the system cold makes it show itself.
  2. Head Gasket Ruled In or Out:
    A system that will not hold pressure, combined with a combustion gas test, distinguishes an external leak from a failed gasket.
  3. Cheap Causes Found:
    A failed pressure cap allows coolant to escape at temperature and costs very little. It is one of the first things tested.
  4. At Your Home or Office:
    No driving a car that is losing coolant to have it looked at.

Why We are the Best Choice for Mobile Cooling System Pressure Test

  • Cap Tested Separately:
    The pressure cap is tested on its own, because a cap that releases early lets coolant out with the system otherwise perfectly sound.
  • Internal Loss Identified:
    Where the system holds no pressure with nothing visible, coolant is going internally, which points at the gasket or a cracked head.
  • Heater Core Considered:
    A wet passenger carpet with coolant loss usually means the heater core, which is easily missed as a cause.
  • Findings Explained Plainly:
    You are told whether this is a hose, a cap, a core or something considerably more serious.

Coolant that disappears is always going somewhere, and the two possibilities are very different. An external leak wets something, even if the evidence is only a crusty residue where it evaporated on a hot component. An internal leak means coolant entering the combustion chambers or the oil, which points at a head gasket or a cracked head. The second possibility is why persistent coolant loss should not simply be topped up indefinitely: coolant in the oil destroys bearings, and coolant in a cylinder can hydraulically lock the engine.

Frequently Asked Questions

  • How can I be losing coolant with no leak?
    Either the leak only opens under running pressure and temperature, in which case a pressure test reveals it, or the coolant is going internally past a head gasket into the cylinders or the oil.
  • What does a pressure test actually do?
    It pressurises the cold system to its normal operating pressure using a hand pump, which recreates running conditions without heat. Leaks that are invisible when cold and unpressurised then become obvious.
  • Can a pressure cap cause coolant loss?
    Yes, and it is a common and inexpensive cause. A cap that releases below its rated pressure lets coolant escape into the overflow at temperature, so the level drops steadily with no leak anywhere.
  • What if the system holds no pressure and nothing is visible?
    That points at an internal leak, usually a head gasket, and a combustion gas test on the coolant confirms it. It is the result nobody wants, but knowing it early prevents further damage.
  • Is a wet passenger carpet related?
    It can be directly. A leaking heater core sits behind the dashboard and drains into the footwell, so coolant loss combined with a damp carpet and a misted windscreen points straight at it.