Blows hot till 3/4 mark then starts blowing cold

2002 Vauxhall Zafira
Car: Vauxhall Zafira
Year: 2002
Categories: Engine & Drivetrain
It blows hot air till the temperature gauge reaches 3/4 Mark then starts blowing cold until the gauge goes back to half way Mark why ?
Problem added: Nov 21, 2015 (8 years ago)
Possibly a faulty thermostat.
'stats work mechanically,
They're closed when cold so the coolant just does the engine,
only when open does it let coolant go through the radiator.
Answered Nov 22, 2015 (8 years ago)

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