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Toyota Celica: Radiator lower tank cracking and coolant loss (ZZT231)

Radiator lower tank cracking and coolant loss (ZZT231) is a common cooling fault on the Toyota Celica on the 1999–2006 cars, and we rate it major. Putting it right costs $350 to $900 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 17 documented faults on the Toyota Celica.

Vehicle
Toyota Celica
Years
1999–2006
Fuel
petrol
System
Cooling

This page covers the Toyota Celica as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Toyota Celica faults17 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Radiator yet. We would rather show none than show a picture of a different part.

What goes wrong

The ZZT231 Celica uses a plastic-tanked aluminium core radiator. The lower plastic tank develops cracks at the crimped joint with the aluminium core after approximately 10–15 years, leading to coolant seepage and eventually a significant leak. The failure is accelerated by pressure cycling and the high underbonnet temperatures associated with the 2ZZ-GE. Coolant loss causes overheating and risks head gasket damage, particularly serious given the existing oil consumption vulnerabilities of the 2ZZ-GE.

What you would notice

  • Coolant level dropping requiring periodic top-up
  • Small puddle under front of car after parking
  • White crusty residue around the lower radiator tank seam
  • Temperature gauge rising in traffic

How to check it

Where to look. Radiator mounted at front of engine bay. Lower plastic tank at base of radiator core.

With engine cold, inspect the lower radiator tank seam for cracks or coolant staining. Check hose connection points at each end of the lower tank. Squeeze hoses to feel for softness indicating age. Check coolant colour for contamination.

Parts involved: Radiator.

What it costs to put right

$350 to $900 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Has the coolant level ever needed topping up between services?”
  • “Has the radiator been replaced or repaired?”
  • “Has the car ever overheated or had a temperature warning?”

Now check the Toyota Celica you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Toyota Celica buyer questions

Is radiator lower tank cracking and coolant loss (zzt231) serious on a Toyota Celica?

We rate it major and common on the Toyota Celica. The ZZT231 Celica uses a plastic-tanked aluminium core radiator. The lower plastic tank develops cracks at the crimped joint with the aluminium core after approximately 10–15 years, leading to coolant seepage and eventually a significant leak. The failure is accelerated by pressure cycling and the high underbonnet temperatures associated with the 2ZZ-GE. Coolant loss causes overheating and risks head gasket damage, particularly serious given the existing oil consumption vulnerabilities of the 2ZZ-GE.

How much does it cost to fix on a Toyota Celica?

$350 to $900 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Toyota Celica years are affected?

Our research records this fault on the 1999–2006 Toyota Celica. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

With engine cold, inspect the lower radiator tank seam for cracks or coolant staining. Check hose connection points at each end of the lower tank. Squeeze hoses to feel for softness indicating age. Check coolant colour for contamination. Look here: Radiator mounted at front of engine bay. Lower plastic tank at base of radiator core.