K so yet another issue. I first noticed this when i posted the thread about overheating. The overheating was a symptom not the issue.
Im loosing coolant only when im driving. Everyday when i go to work my overflow tank is empty and the rad is a low (sometimes below the top of the fins). Ive been looking and looking, every day 2 times, and cannot find any leaks. Today i sat and watched it for OVER an hour, and it didnt drop 1 bit, then i get on the freeway, driving for 15-20 min, and the entire overflow is empty and the rad is 1/2 between the top of the fins and neck. Im having to put 1/2gal in every day (maybe more depending on how much the recover tank holds)
I am running mostly water it was 50/50 but since its been leaking i have been putting in water not coolant (to $)
Sometimes its makeing decent pressure, some times its not. Usually with it at 180-190* i can pop the cap and nothing bubbles out, even if its 100% full.
So far i have done the following:
- bleed air, refill
- checked hose integraty, including overflow hoses
- checked every hose even the ones under the intake. fire wall, all rad hoses, heater, and small coolant hoses in the block and intake area
- laid under the car for 30 min and watched for leaks, nothing
- ran a catch can to where the excess coolant comes out of the overflow, its dry every time i check it. (the OUT hose)
- opened the cap, cold and hot, given it WOT for 1/2 to 1 sec and watched the rad for bubbled (sign of compression from motor getting in there) NO bubbles
- checked the recover tank for bubbled while running hot and cold. Nothing
- checked the freeze plugs, and all around the head, nothing.
- let it run for over an hour watched everything, nothing, not a drop dripple or splash.
- checked exhaust for water coming out, cant see any, i do have a leak at the DP, but i looked under there to.
- smelled rad and revocery tank for exhaust smell
It can sit there and run run run run, no leaks, i drive it 15-30 min and im low.
All tests and watching have been done with and without the heater on. both hot and cold. I can find nothing, but its losing alot of coolant.
Like i said, i can open the cap hot also, the hose feels like it has some pressure, sometimes when i open it a wosh noise comes out, but since its low on coolant, no water comes out.
Today when i got home i put a bottle of UV die in the system. I will continue to monitor. I might put 60-70% anti freeze, cause maybe the water is evaporating.
Im really at a loss here, this is SO weird. plz help
1992 geo tracker 2 door 1.6L 8v tbi motor 4X4.
No p/s, a/c yes, 5 speed manual. USA fed emission.
Rebuilt motor - minus rod bearings, rings, and oil pump.
Leaking 1q oil per 500 miles. Cat missing, hole in exh, in dp. Was o/h - new rad + fixed it. Had low oil pressure, now 15-20
New rad, hoses, WP, thermo, cap, alt, 6 ga charging wire, ac compressor (cracked, leaked freon), starter, batt, 02 sensor, vac lines, map filter. New exh on the way.
Pulled intake, cleaned egr
Last edited by ub3rn00ber; 07-29-2011 at 12:30 AM.
Did you check the top radiator tank they tend to crack and fluid evaporates before it hits the ground. This happened on my 92 ad 2000. The only other way is to get access to a radiator pressure tester harbor freight has them for about $65.00.
water can go 3ways on 5sp G16a
on the deck
in the oil pan
or blown out the exh.
sometimes, you get all 3 or just 1.
YOUR idle test is SUPER. that proved (at 12psi) that the DECK test is not failing. (mostly) (fewdrops)
so you head gasket is bad
we pray only.
the rad leakdown test will prove that 100% (will show you , YES the loop is breached)
a full compression test x4 warm or hot and always WOT.
and full leak down cylinder test. x4
i posted early this week how to do the fancy CYLINDER, leak down test tricks. (this is after the regular test, that is explained in the tool manual)
by pressurizing each cylinder at TDC or compression stroke.
and using a small vacuum line to you ear ?
and listen to these places (all sparks out ,spark plugs)
do each cylinder in turn.
1: adjacent cylinder spark holes.
2: intake plenum (open TB throttle plate , slide tube in, listen) for hisssssssssssss
3: exh post, remove o2 sensor ,listen here.
4: dip stick tube , stick out.
5: oil filler hole.
i can sent the page in my pro, diagnostic book (1987) but you can see this is easy.
this hose tests, is dirt cheap
and a shelled out spark plug with an air fitting welded on the end ,like one does
with replacing valve seals , HEAD on.
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