Having problems with your 1991 Toyota 4Runner ?
I have a bad coolant leak, leaks over night while truck is off, leaks when I start it up in the morning, leaks while parked at school during the day. I can't find the leak, radiator is fairly new, hoses are all secure.
It's sounds like the water pump it only leaks when it's cold because when the engine is hot the seal in the water pump swells up to seal the leak then as the temperature cools off the seal goes back to normal and allows coolant to go by
Try using dish soap mixed w/ water in a spray bottle, and spray down your lines and radiator tjis will bubble where your leak is, It will be easy to find with that.
Repair Help & Product Troubleshooting for 1991 Toyota 4Runner
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