Filler neck shouldnt have nipple to overflow?
07-15-13, 11:07 AM
#1
I've got a nipple for a hose to goto the overflow on both my filler neck cap holder and my radiator cap holder, I'm not sure why??
Car is 87 turbo
Ive.got a flat cap on the filler neck so I see no reason to have a hose connection to goto my overflow when the radiator already has one...I think it may be causing me.to lose coolant pressure idk.
I'm going to go ahead and put.a cap holder without the overflow tube on my filler neck...just wonder why it has an overflow tube on it?
Anyways, hopefully this alleviates any problems it could have been causong my coolant system....two pressure caps.is.certainly unneeded.
I'm running stock pressure cap on the radiator and flat cap on the filler neck...both from mazdatrix
Rotary > Pistons
Car is 87 turbo
Ive.got a flat cap on the filler neck so I see no reason to have a hose connection to goto my overflow when the radiator already has one...I think it may be causing me.to lose coolant pressure idk.
I'm going to go ahead and put.a cap holder without the overflow tube on my filler neck...just wonder why it has an overflow tube on it?
Anyways, hopefully this alleviates any problems it could have been causong my coolant system....two pressure caps.is.certainly unneeded.
I'm running stock pressure cap on the radiator and flat cap on the filler neck...both from mazdatrix
Rotary > Pistons
07-15-13, 11:55 AM
#3
07-15-13, 12:41 PM
#5
Should where the overflow hose.is connected have the pressure cap or does it not matter?
I was gonna keep the flat cap on the filler neck for thermostat etc and put the cap holder with no overflow on it.
Coolant system just doesn't feel like its getting pressurized and its been a concern, I take it for the normal weak drive for breakin and it stays running cool and around 1/4 on gauge .. 4 krpm Max shifts, I have to bleed/burp.the system
..I'm wondering if its just running cool.
the add coolant light came on , I'm.gonna refill/burp/bleed it asap
Rotary > Pistons
07-15-13, 04:16 PM
#7
The S4 thermostat neck that has the nipple is made of metal, and is stronger than the plastic s5 thermostat neck that does not have the nipple. I would either cap off the lowest nipple, or leave them both routed to the overflow bin. There is nothing wrong with that setup. Factory is good sometimes.
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07-15-13, 04:31 PM
#8
S5 are completely different, no cap on the t-stat neck.
s4 has 3 types: aluminum w/o overflow nipple, plastic w/overflow and without.
the best method is to run the overflow from the radiator neck and cap off the nipple on top. this is because the plastic housings tend to warp and not seal 100%.
i run the aluminum cap housing, because it is bulletproof where i have seen the plastic ones leak due to the above in more than one way. it is a superseded part and the same one found on the FD3S.
s4 has 3 types: aluminum w/o overflow nipple, plastic w/overflow and without.
the best method is to run the overflow from the radiator neck and cap off the nipple on top. this is because the plastic housings tend to warp and not seal 100%.
i run the aluminum cap housing, because it is bulletproof where i have seen the plastic ones leak due to the above in more than one way. it is a superseded part and the same one found on the FD3S.
Last edited by RotaryEvolution; 07-15-13 at 04:34 PM.
07-15-13, 05:16 PM
#9
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^ what he said, the S4 has two styles, just pick one.
the early 86-87.5 cars have the overflow tube on the thermostat neck, late 87.5-88 cars add a radiator cap on the radiator, and just a fill cap on the engine.
neither one seems to work any better than the other, so just pick one. if you have some mix of both, you're going to have weird problems
the early 86-87.5 cars have the overflow tube on the thermostat neck, late 87.5-88 cars add a radiator cap on the radiator, and just a fill cap on the engine.
neither one seems to work any better than the other, so just pick one. if you have some mix of both, you're going to have weird problems
07-15-13, 07:11 PM
#10
^ what he said, the S4 has two styles, just pick one.
the early 86-87.5 cars have the overflow tube on the thermostat neck, late 87.5-88 cars add a radiator cap on the radiator, and just a fill cap on the engine.
neither one seems to work any better than the other, so just pick one. if you have some mix of both, you're going to have weird problems
the early 86-87.5 cars have the overflow tube on the thermostat neck, late 87.5-88 cars add a radiator cap on the radiator, and just a fill cap on the engine.
neither one seems to work any better than the other, so just pick one. if you have some mix of both, you're going to have weird problems
swapping on the plastic one w/out the overflow nipple might cause leaks?
I'd get an aluminum one but I can't until I get some money to buy one off mazdatrix.
what should I do ? >.<
I'll take some pics , I don't know exactly how I should have this setup if I have it right or wrong.
The parts did come from a mixture of cars.
I'm gonna most likely block off or swap the thermo neck cap to be blocked off from the overflow and have the flat cap and then the overflow hooked up to.the nipple on the radiator cap with overflow tube and have the pressure cap on the radiator.
the 86-87.5 cars only had one place to fill.coolant?
Rotary > Pistons
07-15-13, 07:19 PM
#11
every time i take one of the plastic necks off and put it back on it bows up in the center now matter how evenly i torque it down. 25 year old plastic ftl.
food for thought.
i've seen about 6 different FC cooling system variants, it seems as if there was little rhyme or reason why some had oddball configurations. some even had no pressure port cap on the radiator OR engine, but placed it just inside of the RF headlight housing by the evap receiver dryer(filling was done by the flat cap on top of the engine), the radiator just has a port off it to feed pressure to the remote cap.
food for thought.
i've seen about 6 different FC cooling system variants, it seems as if there was little rhyme or reason why some had oddball configurations. some even had no pressure port cap on the radiator OR engine, but placed it just inside of the RF headlight housing by the evap receiver dryer(filling was done by the flat cap on top of the engine), the radiator just has a port off it to feed pressure to the remote cap.
Last edited by RotaryEvolution; 07-15-13 at 07:25 PM.
07-15-13, 07:40 PM
#12
i've seen about 6 different FC cooling system variants, it seems as if there was little rhyme or reason why some had oddball configurations. some even had no pressure port cap on the radiator OR engine, but placed it just inside of the RF headlight housing by the evap receiver dryer(filling was done by the flat cap on top of the engine), the radiator just has a port off it to feed pressure to the remote cap.
07-16-13, 08:23 AM
#16
is that the same one as this?
listed on mazdatrix for 87-88
http://mazdatrix.com/getprice.asp?partnum=15-17Y0-N323
Rotary > Pistons
listed on mazdatrix for 87-88
http://mazdatrix.com/getprice.asp?partnum=15-17Y0-N323
Rotary > Pistons
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