Overpressurization?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

JoesSHO

New Member
Joined
Nov 27, 2003
Messages
1,660
Reaction score
77
Location
Reality
Overpressurization? Sensor?

Hi guys, I have a new problem with my SHO- I had posted a thread a few weeks ago about my car overheating after installing a Dynomax catback, and a Midwest SHO y-pipe with cats. Well, it's still going on, but with a twist.

The first original issue was when I was driving it back from the exhaust swap- it was bleeding coolant out the overflow bottle. Seemed to be running okay, and not hot, but the fan was on, and I didn't push it. I'd driven it since then, and no issues. The car is driven VERY infrequently- on weekends if nice, and I've put maybe 100 miles on it in the last 4 weeks.

Next, last week, it seemed that the fan was running very frequently, and for too long- almost constantly. But not overheating. Keeping at the low end of the gauge, where it normally runs. Since then, including today, it runs almost all the time, no matter how hot the engine is. I got in to pull it out of the garage, bone cold, and started the car, fan came on. It does cycle, but it comes right back on like 30 seconds later, and does it even if the car is cool.

Sunday, I started it up, drove to the ice rink (about 3 miles away, but enough to warm up) parked it, and when I got back out to the car 1 hour later, coolant had been leaking out from between the top tradiator hose and the neck on the radiator. The radiator was replaced about 5,000 miles ago as well as all the hoses by the previous owner- there is no crack and everything is tightened up, and was tight at the time- I checked. I drove it home, parked it, and no leaks.

Is the system somehow overpressurizing? Bad thermostat? Thoughts? I'm stumped! :shrug:
 

SolidState

No Mo SHO
Joined
May 15, 2002
Messages
2,464
Reaction score
146
Location
Toronto, Ontario, Canada
IIRC, the fan is controlled by the ECT, which isn't the same as the guage temp sender.

Ig I was in this situation, I would replace the ECT and the thermostat to start. Two quick and easy things to replace that often fail. IMHO, get ford parts for both and be done with it.

And Make sure you bleed all the air out of the system...
 

kryan

New Member
Joined
Oct 21, 2005
Messages
2
Reaction score
0
Location
Halfmoon, NY
might want to replace the radiator cap first. That regulates pressure in the system.
 

khanartist

oldtimer....
Joined
Nov 12, 2004
Messages
87
Reaction score
1
Location
Windsor, ON, CA
I think rad cap. If you can, take it to a shop and they can pressurize the system with the engine off and you'll be able to see what's happening.
 

JoesSHO

New Member
Joined
Nov 27, 2003
Messages
1,660
Reaction score
77
Location
Reality
Rad cap

I'll move in process of least resisatance- rad cap first, etc... The cap makes sense to me, since it just cropped up out of nothing. I'll check the rest if no solution.

Thanks, guys!
 

Forum statistics

Threads
107,077
Messages
1,181,199
Members
16,142
Latest member
Kaevorlly

Members online

Back
Top