White Steam Shooting From Radiator Cap
#1
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White Steam Shooting From Radiator Cap
Hello! I am new to the forum and I look forward to attaining alot of information here! Thank you in advance!
My car has been shooting white steam from the radiator cap. Also, the temp gauge would go to half, but then go back down to cold even though I was driving the car. It was doing this for a while, so I researched and changed various things such as:
1. Radiator Cap
2. Thermostat X2
3. Water Pump
4. Changed coolant temp sensor
5. Finally Replaced Head Gasket
The shop that fixed it gave me a new cap as well. It was fine for a month, but now the coolant gauge barley moves and this morning after a 15 minute drive, if began to shoot the coolant out. No one has been able to answer this correctly for me and I'm all out of options.
Please help with any advice you have that may be causing this issue. Thank you very much!
My car has been shooting white steam from the radiator cap. Also, the temp gauge would go to half, but then go back down to cold even though I was driving the car. It was doing this for a while, so I researched and changed various things such as:
1. Radiator Cap
2. Thermostat X2
3. Water Pump
4. Changed coolant temp sensor
5. Finally Replaced Head Gasket
The shop that fixed it gave me a new cap as well. It was fine for a month, but now the coolant gauge barley moves and this morning after a 15 minute drive, if began to shoot the coolant out. No one has been able to answer this correctly for me and I'm all out of options.
Please help with any advice you have that may be causing this issue. Thank you very much!
#2
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Re: White Steam Shooting From Radiator Cap
Coolant bled of air properly?
Radiator fan coming on?
Radiator blockage?
Heater working inside cabin at idle and while driving?
Ever put a bottle of headgasket sealer in coolant system?
Radiator fan coming on?
Radiator blockage?
Heater working inside cabin at idle and while driving?
Ever put a bottle of headgasket sealer in coolant system?
#3
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the steam might have eroded the plastic neck of the rad. wait til the engine is cold and pull off the cap to check for damage, new rad is pretty cheap and easy to replace
#4
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#5
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Re: White Steam Shooting From Radiator Cap
Is that something that could have been a common issue? When it first got fixed, the cap area did not steam up at all.
#6
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Re: White Steam Shooting From Radiator Cap
#7
If you think a good mechanic is expensive, try hiring a bad one
Re: White Steam Shooting From Radiator Cap
This example did not leak to the outside, but instead it would not allow pressure to build up in the radiator, it just vented directly into the reservoir all the time.
Yours could be all black with no antifreeze residue, but if the ring isn't smooth and flat, it's trashed.
Last edited by ezone; 10-28-2017 at 11:09 PM.
#9
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Re: White Steam Shooting From Radiator Cap
Handy pic of steam erosion damage, but this one still has the residue from the boiled antifreeze (and maybe stop leak) kinda covering the eroded ring surface...Anyway, during a serious overheat event steam literally melts the nylon away so the rubber gasket of the cap no longer seals under pressure.
This example did not leak to the outside, but instead it would not allow pressure to build up in the radiator, it just vented directly into the reservoir all the time.
Yours could be all black with no antifreeze residue, but if the ring isn't smooth and flat, it's trashed.
This example did not leak to the outside, but instead it would not allow pressure to build up in the radiator, it just vented directly into the reservoir all the time.
Yours could be all black with no antifreeze residue, but if the ring isn't smooth and flat, it's trashed.
Mine had a little damage, probably from overheating before. Does the white steam mean the engine is overheating?
#11
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Re: White Steam Shooting From Radiator Cap
I want to add this. Before, the small hose that goes from the radiator to the coolant reservoir used to pop off when I drive. But that isn't happening any more, but the steam(Coolant) still shoots from the radiator cap. Would built up pressure cause this to happen as well?
#12
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im just thinking .. escaping steam means theres a leak somewhere.. specially odd to escape at such low temps...as you said it never overheats.
#13
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Re: White Steam Shooting From Radiator Cap
I've seen the temp gauge read 1/2 and then when I idle, I can see steam coming from the hood. Sometimes the temp gauge reads C and it still steams. Not sure if the temp sensor is off, or if the car is actually overheating. I do remember that when my temp gauge used to act weird, it would always go to the H when the car was actually overheating.
#14
If you think a good mechanic is expensive, try hiring a bad one
Re: White Steam Shooting From Radiator Cap
Would built up pressure cause this to happen as well?
#15
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2 things that probably have nothing to do with it..
1. "used to always go to the HOT" keep a mental note head MAY be warped.
2. when this steam is coming up from... wherever... are your fans coming on?
1. "used to always go to the HOT" keep a mental note head MAY be warped.
2. when this steam is coming up from... wherever... are your fans coming on?
#16
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#17
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#18
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Re: White Steam Shooting From Radiator Cap
The steam is coming from the radiator cap. And yes, the fans work as they should. A/C blows cold and the Heater blows hot.
#19
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Re: White Steam Shooting From Radiator Cap
#21
If you think a good mechanic is expensive, try hiring a bad one
Re: White Steam Shooting From Radiator Cap
Reservoir is supposed to only be half full. See the MAX line somewhere along the side of it.
Level in the reservoir always changes a little as the engine heats up and cools down, but its level should always return to its starting point when the engine is cooled down.
Coolant is getting pushed out of the radiator into the reservoir.......is the radiator staying completely full or is its liquid level always dropping?
Level in the reservoir always changes a little as the engine heats up and cools down, but its level should always return to its starting point when the engine is cooled down.
Coolant is getting pushed out of the radiator into the reservoir.......is the radiator staying completely full or is its liquid level always dropping?
#22
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Re: White Steam Shooting From Radiator Cap
Reservoir is supposed to only be half full. See the MAX line somewhere along the side of it.
Level in the reservoir always changes a little as the engine heats up and cools down, but its level should always return to its starting point when the engine is cooled down.
Coolant is getting pushed out of the radiator into the reservoir.......is the radiator staying completely full or is its liquid level always dropping?
Level in the reservoir always changes a little as the engine heats up and cools down, but its level should always return to its starting point when the engine is cooled down.
Coolant is getting pushed out of the radiator into the reservoir.......is the radiator staying completely full or is its liquid level always dropping?
The reservoir is staying full, while coolant is shooting from the radiator cap.
#23
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its crazy because ive seen hoses pop...and radiators explode before caps fail... if you got low temperature steam escaping id assume you got the wrong cap.. idk sounds weird.
#24
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Re: White Steam Shooting From Radiator Cap
I've had a hose pop before. It's a hose in the back. A real pain to replace in my opinion. The first known cap I had with this car had a black covering on it.
#25
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i wouldnt trust the mechanic.. for my own piece of mind id go to autozone and have them look up the proper cap and sell it to ya.. might not fix it but you can rule out wrong cap.
#26
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Re: White Steam Shooting From Radiator Cap
Honestly this would be the third cap. I bought two myself and the mechanic got a new one as well. Now I'm on cap number four.
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#28
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Re: White Steam Shooting From Radiator Cap
Why can't the radiator cap seal? Inspect the radiator surface closely where the two cap gaskets have to seal.
Refill and dry everything, then start it up and WATCH to pinpoint exactly where it's leaking.
Refill and dry everything, then start it up and WATCH to pinpoint exactly where it's leaking.