- classifieds - forums

Go Back Forums > Models > Saturn S-Series > S-Series Tech

Thread Tools Display Modes
Old 02-01-2008, 02:20 PM   #1
MickSaturn is on a distinguished road
MickSaturn's Avatar
Join Date: May 2006
Location: VA
Posts: 156

1994 SL2
Default Easiest Way to Check for Cooling System Pressure Loss I swapped out my water pump and my radiator. I've lost about a pint of coolant in 60-80 miles. And when I drive it til it warms up and then go to loosen the coolant tank cap, there's a little pressure but not like what I would expect. If I recall in the past it would be like major explosion of coolant if I tried to remove the cap with a hot engine.

So I have a pressure loss somewhere. The coolant doesn't appear to be ending up in my oil because I changed the oil about 40 miles ago and it still looks good. Maybe one of the hoses?

So what is the recommended way for a DYer to find a tiny leak like this besides just feeling around and listening while the motor is running. I cab also pull some cardboard out and put it under the car to see if anything is dripping while it's running. But assuming nothing is dripping, how would you pressure test it and isolate the leak?


94 SL2 190K miles
02 Jetta 135K miles
98 Grand Caravan 130K miles
MickSaturn is offline   Reply With Quote Sponsored Links
Old 02-01-2008, 02:55 PM   #2
Sky King
Master Member
Sky King is on a distinguished road
Sky King's Avatar
Join Date: Jan 2005
Location: Memphis Tennessee
Posts: 2,305

1999 SC2
1995 SL2
Default Re: Easiest Way to Check for Cooling System Pressure Loss

To test a cooling system for leaks and its ability to retain system pressure you can do a cooling system pressure test with the engine off and cold. You need a way to pressurize the system to approximately 15 PSI. You can either buy or in some cases, rent a cooling system pressure tester. This is a tool that has what looks like a hand air pump and an adapter to the cooling system resevoir. You pump it up and watch the pressure gauge to see if it holds. Also while it is pressurized, you can look around for coolant leaking out.

You can also make a home made pressure tester. This is from another member, BarnOwl. He made this and from the looks of it, it should do very well. You still need a source of pressurized air.

Originally Posted by BarnOwl
You can do what I did to find the leak when I swapped engines. Make one of these:

Put it inline in the return hose at the top of the reservoir. I used one of those compressors that plug into the cigarette lighter and have a built in pressure gauge to pressurize it. No higher than 15 PSI. Also check inside the car once it's pressurized. I had a heater hose that leaked into the interior.
Well I tried to copy the post he made showing a picture of it, but apparently you can't copy pictures from one post to another. So I'll just get you a link to the thread.

Go here: Not sure how far down it is but a post by BarnOwl has a picture of the pressure tester he made.
1999 SC-2 280,000 miles -mine now also dead, RIP
1995 SL-2 296,000 miles - my wifes totaled, RIP
1993 Chevrolet S-10 Pick-up - mine
2003 Harley Davidson Low Rider - mine

Last edited by Sky King; 02-01-2008 at 03:03 PM.
Sky King is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help with AutoZone's Cooling System Pressure Tester The Critic S-Series Tech 4 12-30-2008 09:12 AM
Cooling system pressure? Cat Fuzz S-Series Tech 4 08-08-2008 05:21 PM
is there anyway to pressurize the cooling system to check for leaks on a 1.9DOHC? turbobuick33 S-Series General 19 12-10-2005 08:54 PM
Cooling System Pressure Gottofried S-Series General 3 09-16-2005 01:31 AM
Cooling System over pressure problem flyingw80 S-Series Tech 22 10-23-2003 11:36 AM

All times are GMT -4. The time now is 09:21 AM.

Advanced Forum Search | Advanced Photo Search

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc. The Saturn Enthusiasts Site.