Why is my coolant sensor popping out??

40

Asked by Feb 20, 2015 at 05:40 PM about the 2005 Ford Explorer Eddie Bauer V6

Question type: Maintenance & Repair

I was driving down the highway the other day and I had to gun my engine to pass someone up and I immediately smelled coolant and saw a path of liquid following me down the highway.  When I pulled over and popped the hood I saw that the coolant sensor had popped out of the top of the thermostat housing and all of the coolant had sprayed through its hole.  I filled radiator back with water and put sensor back in and it drove fine home.  I tested again this morning by gunning engine and the sensor plug popped back out.  I don't notice any type of clip to hold it in on any pictures ive seen online so my question is why is it popping out?? Is/Was there air in the system?  Is the fitting for the plug in the thermo housing just worn out?  I don't want to buy a new housing or plug if I don't need to.  

I've attached some pics

Thanks for your help!

4 Answers

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Second pic

It should have threads on sensor un plug wire and screw back in don't tighten to much or threads will stripp

17,160

On my 2003 there is a spring clip which hold the unit in the thermostat housing. Mine is U shaped. Look for a groove on the housing, it may be there and bent not holding the unit in place with sufficient. Could the radiator be blocked. If you're building up a lot of pressure it could be blowing it out.

17,160

Was it replaced at any time you know of? If it is held in place with a clip, like mine, it took quite a bit of force to compress the O ring so I could insert the clip.

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