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Bubbles in the upper radiator hose #4518974
09/17/17 08:59 PM
09/17/17 08:59 PM
Joined: Jul 2017
Posts: 183
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 183
Venezuela, South America
I have been very aware about how is the cooling system is working because I am going to do a long travel with my car the next month. I have noticed that when I get home and the engine is at operating temp I can feel bubbles in the upper radiator hose (the coolant is boiling), my coolant temp gauge is as normal in the middle and my cooling fan isnīt always on in this condition, I mean the cooling fan switch turns the fan on and off, it isnīt on all the time like when the engine is really overheating. I have keeping track off the coolant levels for one week and I havenīt lost any coolant.

Are this bubbles normal? Should the coolant boil at normal engine operating temp?

I am going to do a 2nd coolant flush and put a new radiator cap anyway but I would like to know if this condition is normal.

Re: Bubbles in the upper radiator hose [Re: Emanuel] #4519037
09/17/17 10:13 PM
09/17/17 10:13 PM
Joined: Aug 2008
Posts: 3,162
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,162
USA
New radiator cap may fix it. If the system cannot hold pressure then the water/coolant will want to boil at a lower temp than normal.

Re: Bubbles in the upper radiator hose [Re: Emanuel] #4519038
09/17/17 10:17 PM
09/17/17 10:17 PM
Joined: Aug 2009
Posts: 3,900
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,900
Pittsburgh,PA U.S.A.
Bubbles in coolant is not normal and if the engine is not over-heating it usually indicates a blown head gasket.

If I were you I would be looking for another vehicle to take on your long trip next month.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Bubbles in the upper radiator hose [Re: Emanuel] #4519045
09/17/17 10:23 PM
09/17/17 10:23 PM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
USA
Do you know the coolant is 50/50 mix with water?

Do you have an actual gauge that provides the temperature of the coolant in Celcius?

I agree with the possibilty of a bad radiator cap if the coolant mixture is unknown but the risk of a blown head gasket is also a real possibilty.


Multiple Diesel and Gasoline vehicles
Re: Bubbles in the upper radiator hose [Re: Emanuel] #4519048
09/17/17 10:25 PM
09/17/17 10:25 PM
Joined: Aug 2009
Posts: 3,900
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,900
Pittsburgh,PA U.S.A.
If it is over-heating and also with over-heating having bubbles in the coolant then it could either be a clogged radiator, or a water-pump that is not circulating enough coolant.

But if it is not over-heating and has bubbles in the coolant then look for a blown head gasket.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Bubbles in the upper radiator hose [Re: ArcticDriver] #4519051
09/17/17 10:27 PM
09/17/17 10:27 PM
Joined: Jul 2017
Posts: 183
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 183
Venezuela, South America
The gauge isnīt in celsius, but I thought that the middle in the gauge was normal operating temp...

Re: Bubbles in the upper radiator hose [Re: Emanuel] #4519053
09/17/17 10:28 PM
09/17/17 10:28 PM
Joined: Jul 2017
Posts: 183
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 183
Venezuela, South America
The head gasket was changed the last year, and the head was resurfaced too so I think it might be the radiator cap

Re: Bubbles in the upper radiator hose [Re: Emanuel] #4519061
09/17/17 10:42 PM
09/17/17 10:42 PM
Joined: Jul 2017
Posts: 183
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 183
Venezuela, South America
I don't think the problem is related to not enough flow from the water pump, because the temp gauge will be higher and the cooling fan would be on all the time.

Re: Bubbles in the upper radiator hose [Re: Emanuel] #4519070
09/17/17 11:03 PM
09/17/17 11:03 PM
Joined: Sep 2004
Posts: 7,529
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,529
Marshfield , MA
Another vote for a cap. If that doesn't fix it, the increase in pressure may make the trouble worse enough to make the diagnosis easy. Carry a few gallons of water and pay attention to what the engine sounds and smells like. If the coolant is mixing with the oil, that is bad. But if the oil is clear, all you need is to carry enough water. This is a manageable trouble, but you have to pay attention grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Bubbles in the upper radiator hose [Re: Emanuel] #4519099
09/18/17 01:12 AM
09/18/17 01:12 AM
Joined: Aug 2006
Posts: 9,804
Central Washington
Colt45ws Offline
Colt45ws  Offline
Joined: Aug 2006
Posts: 9,804
Central Washington
Agree with coolant cap. There are hot spots in the engine that will boil coolant if there is no pressure. Its possible you are not working the car hard enough to overheat it but this condition will usually lead to overheating.


-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2
Re: Bubbles in the upper radiator hose [Re: Emanuel] #4519143
09/18/17 06:06 AM
09/18/17 06:06 AM
Joined: Jul 2005
Posts: 30,439
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,439
NY
Odds are it is the radiator cap, but it could also be the head gasket. I've seen replaced head gaskets fail in less than a year. I would pressure test the cooling system and test the radiator cap as well, and go from there. There's nothing wrong with playing it safe, especially in a case where the head gasket was replaced.


God Bless Our Troops

Re: Bubbles in the upper radiator hose [Re: JimPghPA] #4519258
09/18/17 09:13 AM
09/18/17 09:13 AM
Joined: Apr 2012
Posts: 3,159
Boston, MA
Bgallagher Offline
Bgallagher  Offline
Joined: Apr 2012
Posts: 3,159
Boston, MA
Originally Posted By: JimPghPA
Bubbles in coolant is not normal and if the engine is not over-heating it usually indicates a blown head gasket.

If I were you I would be looking for another vehicle to take on your long trip next month.


+1 That being said I would check the oil and coolant and possibly sending a sample to have it tested. Only way to be sure. Otherwise I would replace the cap and try burping the system of any air.


2017 Chevy Traverse - 28k - Delco Dexos 1 and PF63
2014 Chevy Equinox - 22k - Delco Dexos 1 and PF457G
2015 GMC Terrain - 22k- Delco Dexos 1 and PF457G
Re: Bubbles in the upper radiator hose [Re: Emanuel] #4519288
09/18/17 10:16 AM
09/18/17 10:16 AM
Joined: Jul 2017
Posts: 183
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 183
Venezuela, South America
There arenīt any traces of oil in the coolant or traces of coolant in the oil, and Iīm not loosing any coolant. Today I will put the new radiator cap and see

Re: Bubbles in the upper radiator hose [Re: Bgallagher] #4519439
09/18/17 01:43 PM
09/18/17 01:43 PM
Joined: Jul 2005
Posts: 30,439
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,439
NY
Originally Posted By: Bgallagher
Originally Posted By: JimPghPA
Bubbles in coolant is not normal and if the engine is not over-heating it usually indicates a blown head gasket.

If I were you I would be looking for another vehicle to take on your long trip next month.


+1 That being said I would check the oil and coolant and possibly sending a sample to have it tested. Only way to be sure. Otherwise I would replace the cap and try burping the system of any air.


Pressure testing will tell you in a matter of minutes if the HG is bad or not.


God Bless Our Troops

Re: Bubbles in the upper radiator hose [Re: demarpaint] #4519459
09/18/17 02:06 PM
09/18/17 02:06 PM
Joined: Apr 2012
Posts: 3,159
Boston, MA
Bgallagher Offline
Bgallagher  Offline
Joined: Apr 2012
Posts: 3,159
Boston, MA
Originally Posted By: demarpaint
Originally Posted By: Bgallagher
Originally Posted By: JimPghPA
Bubbles in coolant is not normal and if the engine is not over-heating it usually indicates a blown head gasket.

If I were you I would be looking for another vehicle to take on your long trip next month.


+1 That being said I would check the oil and coolant and possibly sending a sample to have it tested. Only way to be sure. Otherwise I would replace the cap and try burping the system of any air.


Pressure testing will tell you in a matter of minutes if the HG is bad or not.


True but I always preferred to have it sent out and see just how much if any is being contaminated.


2017 Chevy Traverse - 28k - Delco Dexos 1 and PF63
2014 Chevy Equinox - 22k - Delco Dexos 1 and PF457G
2015 GMC Terrain - 22k- Delco Dexos 1 and PF457G
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