Coolant overflow issue
#1
Smooth Criminal
Thread Starter
Coolant overflow issue
The image I am posting, is our standard coolant overflow reservoir. But I have a question. Why would there be coolant coming out of the black rubber hose to the right of the cap? I have been smelling a faint coolant smell for a couple days, and have been trying to track it down. I was under the car, and don’t see any coming from the water pump, which was recently replaced, and don’t see any coming from any hoses, or anything connected to the radiator, except this little black hose. It is splattering on the side of the Revi housing, and it is around the lip of the overflow reservoir. It is not a lot, but why did this start happening, after almost 60K miles. I just want to make sure there is not another problem, that is causing the overflow bottle to leak out of this little hose.
Any advice, tips, ideas, or possible problems/solutions, would be greatly appreciated. Thanks in advance.
Any advice, tips, ideas, or possible problems/solutions, would be greatly appreciated. Thanks in advance.
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Ahmed Mohamed (11-20-2020)
#2
Anatomy of a corner...
Does it to me too. Turning fast seems to do it... Tracks make you turn fast Also, the coolant mixture expands when heated and thus seems more prone to coming out the overflow tube.
Why was your water pump replaced?
BTW--you are missing a nut on that bolt...
FS
Why was your water pump replaced?
BTW--you are missing a nut on that bolt...
FS
#3
Smooth Criminal
Thread Starter
well, I have noticed the smell after just street driving, and then this weekend I noticed it a lot more after some alleged late night autocross sessions, but it was too dark to look for the evidence. and today I saw all of the splatter that had not been there before, since I had just cleaned everything on Friday.
Water Pump was replaced because it was leaking.
and Mazda lost that nut when they did the water pump, don't ask me how, and I just have not gotten a new one. It is secure where it is, and is not going anywhere. But i do need to get a replacement nut.
Water Pump was replaced because it was leaking.
and Mazda lost that nut when they did the water pump, don't ask me how, and I just have not gotten a new one. It is secure where it is, and is not going anywhere. But i do need to get a replacement nut.
#5
Smooth Criminal
Thread Starter
mostly the smell is outside the car, most noticeable when in the garage, but sometimes it is perceptible in the car, because the windows are open, or the climate control is using outside air, and not the recirc function.
#7
Lubricious
Join Date: Oct 2003
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The black hose is there to relieve pressure if the car is overheating. The possibilities I can think of:
1 - the overflow tank was overfilled with coolant
2 - the cap is leaking/not holding the proper pressure
3 - the car is actually overheating
1 is easy enough to determine. If that's not it, then I'd try a new cap, and make sure to clean and inspect the seating surface on the tank to make sure it's not damaged. Hopefully that will take care of it.
1 - the overflow tank was overfilled with coolant
2 - the cap is leaking/not holding the proper pressure
3 - the car is actually overheating
1 is easy enough to determine. If that's not it, then I'd try a new cap, and make sure to clean and inspect the seating surface on the tank to make sure it's not damaged. Hopefully that will take care of it.
#8
Registered
Another possibility is that you have a blown internal coolant seal that is causing over pressurization of the coolant system which results in coolant blowing out the overflow pipe. Probably should have that possibility checked out as well.
#11
I know exactly what your problem is....................
Lokk on the right.
Your missing the nut. You think it's tight but it ain't.
Go around a track or spirted driving and you will see what I mean.
Lokk on the right.
Your missing the nut. You think it's tight but it ain't.
Go around a track or spirted driving and you will see what I mean.
#13
Hmmmmmm.........
Join Date: Mar 2005
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I just had this problem. I was told the thermostat was screwed so coolant wasnt circulating properly. Now I think about it I dont see how that causes pressure to build up though.
#14
Smooth Criminal
Thread Starter
Originally Posted by TeamRX8
I only got rid of it by changing to Evans NPG-R
new caps, new coolant etc won't do it, they all do it
new caps, new coolant etc won't do it, they all do it
Originally Posted by Razz1
I know exactly what your problem is....................
Lokk on the right.
Your missing the nut. You think it's tight but it ain't.
Go around a track or spirted driving and you will see what I mean.
Lokk on the right.
Your missing the nut. You think it's tight but it ain't.
Go around a track or spirted driving and you will see what I mean.
Originally Posted by auzoom
I just had this problem. I was told the thermostat was screwed so coolant wasnt circulating properly. Now I think about it I dont see how that causes pressure to build up though.
#15
Lubricious
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1 - are you sure it is still actively leaking from the overflow?
If you recently had the water pump replaced you could simply be smelling whatever was spilled/spread around during that repair.
Might help to pull off the overflow hose, clean all traces of the coolant from the area and wash out/dry the hose then see if the "leak" returns.
If you recently had the water pump replaced you could simply be smelling whatever was spilled/spread around during that repair.
Might help to pull off the overflow hose, clean all traces of the coolant from the area and wash out/dry the hose then see if the "leak" returns.
#16
always filling [the c]up
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I've been finding a lot of coolant on my garage floor. I checked my level, and it's beyond Full. Wondering if I should take it out (a syringe maybe) or just let it all leak out. any suggestions?
-Cody
-Cody
#17
Banned
iTrader: (3)
I had frequent over-boilings here in the desert.
I switched to a 1.1 BAR overflow cap from the Millennia S/626/RX-7 and that fixed it.
I also extended that hose so that if there was another purge, it wouldn't spill all over the power steering connections like it does in its OEM configuration.
Now it vents straight to the ground.
I switched to a 1.1 BAR overflow cap from the Millennia S/626/RX-7 and that fixed it.
I also extended that hose so that if there was another purge, it wouldn't spill all over the power steering connections like it does in its OEM configuration.
Now it vents straight to the ground.
#18
Smooth Criminal
Thread Starter
Originally Posted by Nubo
1 - are you sure it is still actively leaking from the overflow?
If you recently had the water pump replaced you could simply be smelling whatever was spilled/spread around during that repair.
Might help to pull off the overflow hose, clean all traces of the coolant from the area and wash out/dry the hose then see if the "leak" returns.
If you recently had the water pump replaced you could simply be smelling whatever was spilled/spread around during that repair.
Might help to pull off the overflow hose, clean all traces of the coolant from the area and wash out/dry the hose then see if the "leak" returns.
Originally Posted by MazdaManiac
I also extended that hose so that if there was another purge, it wouldn't spill all over the power steering connections like it does in its OEM configuration.
#20
Smooth Criminal
Thread Starter
Originally Posted by Brettus
You do realise there is a hot / cold fill line ?
#22
Smooth Criminal
Thread Starter
Originally Posted by olddragger
are you having to add coolant to maintain the proper level? Just trying to get an idea of the volumne you are seeing.
olddragger
olddragger
#23
I had this problem here when going on mountain road drives. I switched to a higher pressure 1.3 bar cap I bought from ebay and have not had the problem since.
It was this exact one.
http://cgi.ebay.com/ebaymotors/MAZDA...QQcmdZViewItem
It was this exact one.
http://cgi.ebay.com/ebaymotors/MAZDA...QQcmdZViewItem
Last edited by murix; 03-27-2007 at 11:15 AM.
#24
No respecter of malarkey
iTrader: (25)
Originally Posted by L8APEX
I am not doubting you, as you know what you are talking about, but if you say switching coolant won't help, how did it help you to switch. I just want to fix the problem, I am tired of smelling coolant. And am willing to try anything..
The Evans NPG-R doesn't boil until 400 degF so the cap doesn't blow off and release coolant. The tank discharge hose drops the blow-off right down onto the radiator/electric fan where it slowly burns off, that's what you're smelling
#25
Smooth Criminal
Thread Starter
Originally Posted by TeamRX8
The Evans NPG-R doesn't boil until 400 degF so the cap doesn't blow off and release coolant. The tank discharge hose drops the blow-off right down onto the radiator/electric fan where it slowly burns off, that's what you're smelling