I noticed that my resivoir for the radiator was empty the other day so I topped it up with water. I came back to it that night and its empty again.
Theres no puddles under the car, or any sign of leakage on or under the plastic resivoir.

The only thing i noticed is that occasionally on the top right of the radioator the metal that connects to the large hose up there smokes for a few minutes.

Is that enough to drain the entire resivoir????

 

Might have a leak from the hose there, where it tightens around the radiator outlet. Might be losing coolant elsewhere too.

 

Nah, tightened the clamp around the hose and didnt see anything to show it was the hose.

 

Check your oil to make sure no coolant is in it.

Did you recently flush your cooling system?

I've seen it where this was done, and you had to keep adding water and coolant for a few days before it gets completely full. I guess that there are air pockets that take a few days to dissapear that causes your symptoms.

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92 Camaro RS, LO3, 5-spd, T-tops

Performance:
K&N Open Air Filter, Edelbrock performer TBI intake, Fastchip Prom, Timing +4 degrees, Centerforce clutch, Xact 8mm wires, SLP 1 3/4" Headers (coated), Flowmaster Catback Exhaust, Z28 Grille w/aftmkt fog lamps, MacEwen white-face guages
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, 3.42 gears w/Torsen posi

 

Yeah, flushing the radiator can leave air pockets in it that when they escape will leave your coolant a little lower.

What's the condition of your radiator cap? It could be allowing steam to escape.

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89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else

 

The radioator cap is new, but I was wondering if the cap on the resivoir could be letting anything out??

And yea I did flush the radiator monday i think, so that might be it too.

Thanks

 

Just so you know, that tank isn't supposed to be full. If it were full, what happens when the coolant heats up and expands? It has nowhere to go and it evaporates. Try just filling it to the "COLD" level and see what happens.

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-Dan
-1990 3.1L RS
-Mods? no
-Slow? yes
-Currently collecting parts for T5 swap

 

You could have a small leak around the intake manifold. The engine heat would be enough to steam the water off, thus you would never see it. It's not draining out of your weep hole on the water pump, is it?

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Rob P
89RSconvtZZ4TPI Edelbrock Intake
SLP Dual Cold Air Intake 1 5/8" Headers Semi-Siamesed Runners, IROC
suspension, alum shaft. Numerous mods.
92Z28convt5spd (stock)
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!