'87 T2 Not drawing coolant back into system from reservoir.
#1
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'87 T2 Not drawing coolant back into system from reservoir.
Okay so I recently got into the rotary game and I've had a bunch of issues already. This issue being that the car will not pull coolant back into the system when the car cools down. I've vacuum filled the system to be sure there are no bubbles and I've ran it with a coolant funnel attached to bleed it. First thing I thought was rad cap or coolant seals so I waited a day and did the cold crank watch for bubbles thing with good results. Cold started the car and saw 0 bubbles. Tested the rad cap, it failed so I bought another one and tested it and it failed! Only to grab my tester and find the other one I was using was broken. So I have 2 good rad caps now. Then I tested the tube from the filler neck to the reservoir, its fine. My hoses aren't collapsed in the morning (or ever), and its not loosing coolant, it takes the same amount back into the system to top it off, never more. I pressurized the system to the spec on the rad cap (I forget,13 psi or something) and came back 18 hours later and it had only dropped 0.5 PSI! What would cause the car to push coolant into the bottle but not bring it back? Good rad cap, Coolant seals seem fine, no visible leaks, no loss of coolant as far as I can tell. Ive been using a 4L jug that I empty the reservoir into and then top the system off with and its still full. Car has 70K Km on the rebuilt motor. Possibly the original water pump, would that cause my issue somehow?
Sorry if this post is jumbled and shitty or if I'm leaving out some really obvious information, its my first post
Car is an 87 with s5 rotors and housing, s4 front cover and everything else I believe. rtek 1.5, 720cc secondaries, slightly bigger turbo (Trying to figure out exactly what it is), koyo rad, blitz blow off valve, wideband AFR, omp delete running 1:100 premixed fuel, N/A racing beat exhaust, no cats, and suspension mods.
Sorry if this post is jumbled and shitty or if I'm leaving out some really obvious information, its my first post
Car is an 87 with s5 rotors and housing, s4 front cover and everything else I believe. rtek 1.5, 720cc secondaries, slightly bigger turbo (Trying to figure out exactly what it is), koyo rad, blitz blow off valve, wideband AFR, omp delete running 1:100 premixed fuel, N/A racing beat exhaust, no cats, and suspension mods.
Last edited by BakedAlex; 10-29-15 at 10:34 PM. Reason: Adding details
#3
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There is supposed to be some liquid in the overflow in order for it to work properly. It's not a catch can.
OP: Check that the hole in the filler neck isn't clogged. The inside opening is quite small. Other than that, is there coolant in the bottle to begin with? Is the straw in the overflow tank submerged?
There's only a couple of parts to the system and none are particularly expensive.
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Actually it does when it cools down. Coolant expands when heated, so the extra volume gets pushed into the overflow. When cooled, a sealed system creates vacuum and pulls some back in.
There is supposed to be some liquid in the overflow in order for it to work properly. It's not a catch can.
OP: Check that the hole in the filler neck isn't clogged. The inside opening is quite small. Other than that, is there coolant in the bottle to begin with? Is the straw in the overflow tank submerged?
There's only a couple of parts to the system and none are particularly expensive.
There is supposed to be some liquid in the overflow in order for it to work properly. It's not a catch can.
OP: Check that the hole in the filler neck isn't clogged. The inside opening is quite small. Other than that, is there coolant in the bottle to begin with? Is the straw in the overflow tank submerged?
There's only a couple of parts to the system and none are particularly expensive.
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Not overheating, not loosing coolant, have heat. Im worried because when it cools it doesnt pull back into the system from the overflow or collapse the hoses it just gets air from somewhere. Its not exhaust either, cooloant is clean and the overflow bottle isnt getting dirty.
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Not overheating, not loosing coolant, have heat. Im worried because when it cools it doesnt pull back into the system from the overflow or collapse the hoses it just gets air from somewhere. Its not exhaust either, cooloant is clean and the overflow bottle isnt getting dirty.
#7
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How and where in the housing the coolant seal failed can hide the issue sometimes. The only other thing I would have suggested trying would be to replace the overflow hose. They’re thin-walled and I could see them staying open with pressure but collapsing under even the mild vacuum seen during cool down.
Last edited by Sgtblue; 11-14-17 at 03:16 PM.
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