What sensor is this?

[BankRunner]

This appears to be the source of a slow coolant leak. Right next to the oil filter. Coolant temp sensor? Any help and insight is much appreciated!

 

[4Runner4Leon]

Oil pressure sending unit.

 

[BankRunner]

Any way that could be the source of a coolant leak? Wouldn’t think so since it’s oil pressure. Any other idea where a leak could be coming from in that area?


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[4Runner4Leon]

Any way that could be the source of a coolant leak? Wouldn’t think so since it’s oil pressure. Any other idea where a leak could be coming from in that area?

It's probably one of the oil cooler lines that snake around that area:

 

[sawguy]

Check under the water pump.

 

[gamefreakgc]

Check under the water pump.

That was going to be my suggestion too. If the weep hole at the bottom of the water pump is seeping fluid, your water pump is about to fail. Probably time for a timing belt too.

Just take out the bolts on the upper timing belt cover (front engine cover with the logo and such) and look down at the bottom with a flashlight. No coolant/rust? Water pump is fine. Wet or has rust? Found the problem.

 

[LittleCaesar]

It's probably one of the oil cooler lines that snake around that area:

Or possibly the thermostat housing or gasket.....

 

[4Runner4Leon]

All good suggestions! Depends where the coolant leak seems to be originating - water pump and thermostat would be more towards the front of the motor (red circle below), oil cooler lines would be more towards the side (blue circle below), where the OP found the leak. Best thing to do is to clean it all off, then monitor closely to see where the leak seems to be originating. Or just start taking parts off to have a better look.

 

[gamefreakgc]

All good suggestions! Depends where the coolant leak seems to be originating - water pump and thermostat would be more towards the front of the motor (red circle below), oil cooler lines would be more towards the side (blue circle below), where the OP found the leak. Best thing to do is to clean it all off, then monitor closely to see where the leak seems to be originating. Or just start taking parts off to have a better look.

Yeah, it really could be either. I've seen the water pump drip down the thermostat housing and off to the side, so if he parks the car on a sloped driveway, etc. the coolant may not drip straight down.

Either way those are the two most likely leak spots. Now it's time for the OP to get under there and figure it out.

 

[BankRunner]

Guys I can’t thank you enough for the pics and guidance. I’ll have some time today or tomorrow to take a few things off and get a better look. This really helps.

Thanks!

 

[nevadamonte]

Coolant Leak on 4Runner

I noticed you had the same problem I'm having. Did you find a solution? Thanks in advance.