🚗 Classic Fault — Toyota (1984–1989)
MR2 Mk1 mid-engined coolant air lock
💰 Estimated Repair Cost
$5 – $20 GBP
Parts and labour estimate
🔧 Tools Required
Funnel, coolant
📋 Overview
The mid-engined layout makes the MR2 prone to coolant air locks when the system is refilled. Leads to overheating.
🩺 Symptoms
- Overheating despite coolant appearing full in reservoir
- heater blows cold
- temperature gauge spikes then drops
🔍 Possible Causes
- Air lock in cooling system
- failed thermostat
- blocked coolant passages
🛠️ Diagnosis Steps
With engine warm and reservoir cap off, squeeze top hose repeatedly to burp air. Fill very slowly through reservoir
✅ Most Confirmed Fix
Correct bleeding procedure — fill slowly with car nose raised
95% of users confirm this fix worked (41 reports)
🩺 Related Symptoms
🔗 Other Toyota Faults
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