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Cooling System Pressure?
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01-30-2009, 11:17 AM
Hey Everyone. I noticed I had a small leak somewhere dripping in the snow when I put the car in the garage. Anyone know what pressure the system needs to be to check it.
DRyanC
2000 Black ZX3 (sold)
2007 Liquid Grey ZX5 ses (sold) 2007 CD Silver ZXW ses 2013 F150 crew xlt 4x4 blue flame 
01-30-2009, 03:37 PM
DRyanC,Jan 29 2009, 08:17 PM Wrote:Hey Everyone. I noticed I had a small leak somewhere dripping in the snow when I put the car in the garage. Anyone know what pressure the system needs to be to check it.You usually remove the rad cap, pressurize it to 18-20 pounds and check the bleed-down. You have to have the fitting that seals the guage to where the cap screws on though to do it properly, a place like Princess Auto might have one. TEAM PITA: Don't settle for a wannabe, only accept the real deal.
*Magnetic Metallic 2015 Focus ST* *Red Candy Metallic 2012 F150 SuperCrew*
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01-30-2009, 09:31 PM
It could be a cracked thermostat housing. It's a common problem with the zetec. You will probably see only a few drops from roughly around the area of where the transmission meets the engine.
The part is about $75 from Ford and takes about an hour to do yourself. Link to fix instructions
vintage 2000 malibu blue ZX3 ***SOLD***
2013 performance blue ST TEAM P.I.T.A.
01-30-2009, 11:14 PM
Thanks guys. I have a pressure tester. I only pumped it up to 10 pounds last night, like I said I didn't know what the system runs at. The first time I pumped it to 10psi it drop to 5 in about 20 min. so I pumped it back to 10 and it never moved. I will try 18 tonight. I guess 10 psi is not enough to move the coolant out of the leak.
DRyanC
2000 Black ZX3 (sold)
2007 Liquid Grey ZX5 ses (sold) 2007 CD Silver ZXW ses 2013 F150 crew xlt 4x4 blue flame 
01-30-2009, 11:54 PM
My T-stat housing has been replaced twice since I have had the car. It would be a good place to start.
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2008 Taurus X to be modded. 2002 ZX5 parted out. Forever known as the "SLOCUS". 2010 Dyno #'s 102.96HP/105.84TQ 2011 Dyno #'s 111.44HP/115.17TQ Still The Weakest Link  Dial 1-800-AUTO-PARTS for your local speed shop. 
01-31-2009, 12:36 AM
Just did my tstat last month, its fairly easy to see if you are leaking enoigh
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'02 black ZX5 ****currently on jack stands my parents garage missing a transmission**** --FC/OBX 4-2-1 Race Header--FS Flex--MBRP catback exhaust--AEM CAI--Brembo Brakes with Hawk HPS pads--Toucan(ractive) 9mm Plug wires--FC Plug wire cover--Polished aluminum Ractive Strut Bar Not installed: FK 60/40 Springs 
02-01-2009, 09:07 AM
10psi should be plenty ... if you put to much pressure in the system you can make things leak that normally wouldn't under regular pressure .. and you also run the risk of having your heater core break due to having to much pressure in the system.
put a piece of cardboard down under the car and that way you can tell where the leak is coming from
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