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Leak at Coolant Temp Sensor on Radiator

495 Views 9 Replies 4 Participants Last post by  RickOntario
Hi, I traced a coolant leak on my 2012 CR-V (EX-L AWD) to the coolant temp sensor located on the lower left side of the radiator. I have pulled apart all the hoses and the front bumper to remove the radiator and take a better look. The plastic housing around the sensor looks fine and so does the sensor. The O-ring looks fine too (visually). All I could see was that the sensor seems to have been over-tightened by some technician at some point because a little bit of the plastic around the sensor bolt was chipped in.
I did a vacuum leak test of just the radiator (see picture below) and the system lost pressure within 30-60 seconds.. I can only guess that it's leaking out of the coolant temp sensor bolt.
Could any of you advise on what should be my next course of action - should I just replace the O-ring or should I get a new sensor or should I replace the entire radiator?
Thanks to everyone in advance. -Rick.
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2007 CRV AWD
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Vacuum test of radiator?
Wouldn't the radiator cap allow for fluid or air to flow back into the radiator as it cooled in normal operation?
As far as I know, radiators are pressure tested??

Would fill with water and pressurize the radiator to see where it is leaking.
 

· Registered
2007 CRV AWD
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Not a fan of Harbor Freight tools for testing vehicles.
But, if you are confident in it then so be it.
However, a vacuum will not let you see where the leak is
A pressurized test would should where the leak is??
No guessing??
 

· Registered
2007 CRV AWD
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2,306 Posts
If the brake rotors are rusted the try running the vehicle with short tests on brakes
Sometimes it will clean itself off. Why not test before replacing?
If it clears up then run with it until you can actually inspect it??
If it does not clear up then you know for certain to do the brake job??

I wish you lots of luck and hope it is something simple and cheap to fix
 
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