Thermostat oring leak? Something else? - Ranger-Forums - The Ultimate Ford Ranger Resource

General Ford Ranger Discussion General discussion of the Ford Ranger that does not fit in any other sub-forum.

LinkBack Thread Tools Search this Thread
Old 02-19-2013
Crunchy's Avatar
Thread Starter
Join Date: Oct 2007
Location: Hull, Quebec
Posts: 486
Thermostat oring leak? Something else?

I have been noticing small spots of coolant on my driveway. I couldn't find any leaks on my engine, so I got some UV flourescent dye, and put it in my radiator to try to find it.

I found where its coming from, need to know whats the exact source.

This is the top of my thermostat housing with a UV light shining on it. It seems to show up on the top of the flat part, and in this seam shown. Is this where the 2 pieces of the housing come together which holds the thermostat?

It might be the 2 sensors, but I don't think so, its never wet around them unless the whoe top is wet, and it dries up not too long after The only liquid coolant around there is where the liquid has collected in that little notch circled in green.

Specs: 2003 4.0 SOHC, 120k miles. Its not leaking bad enough to add coolant, but ts enough to leak a spot on my driveway.

Never changed the thermostat ever. I did do a coolant change last year.

Ohh, its worse when its really cold outside, like -20C or colder.
Attached Thumbnails
Thermostat oring leak?  Something else?-dsc_2336.jpg   Thermostat oring leak?  Something else?-dsc_2343.jpg   Thermostat oring leak?  Something else?-dsc_2345.jpg   Thermostat oring leak?  Something else?-dsc_2344.jpg   Thermostat oring leak?  Something else?-dsc_2349.jpg  

Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
thermostat leak? 02FX4U 4.0L OHV & SOHC V6 Tech 20 02-07-2017 06:31 AM
Water Pump or Thermostat leak KOldfield1983 2.9L & 3.0L V6 Tech 4 04-26-2012 10:08 AM
Thermostat replaced. Coolant leak and now I have a squeak feh728 2.9L & 3.0L V6 Tech 1 11-03-2010 09:08 AM
Holy Crap! My Truck is Something Else with.. BlkTremor02 General Ford Ranger Discussion 28 09-01-2006 09:51 AM
speed limiter? or something else? caprice96 2.3L & 2.5L I4 Tech 17 04-17-2006 10:58 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -6. The time now is 09:25 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.