Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko.com | Corporate |
| Latest | 0 Rplys |
01-22-2018, 12:25 AM | #1 | |
AF Newbie
Join Date: Sep 2007
Location: Verona
Posts: 81
Thanks: 1
Thanked 0 Times in 0 Posts
|
Water bubbling..
Hi everybody. I already took a look to threads concerning this issue but I need to ask something:
- 2002 ltz 4.2 - Bubbling happens in big top radiator hose when I turn off engine - Water pump just replaced - 225000 km engine - No water in the oil, no oil in the water - Engine temperature always perfect - Just flush cooling circuit with a bardhal cleaner but radiator is very hot at the top where I can feel bubbling, cool the rest My buddy mechanic says to replace radiator but water seems to go through easy if I disconnect both hoses and let water drop inside by a garden hose.. So what could be next? New radiator or head gasket? Thank you!! |
|
01-22-2018, 08:32 AM | #2 | |
AF Fanatic
Join Date: Jul 2011
Location: Worcester, Massachusetts
Posts: 5,017
Thanks: 70
Thanked 618 Times in 610 Posts
|
Re: Water bubbling..
You have opened up the system, since it is not overheating, it's possible it's not completely burped of air....
|
|
01-22-2018, 08:32 AM | #3 | |
A990 racer
Join Date: Mar 2002
Location: Chestertown, New York
Posts: 16,988
Thanks: 25
Thanked 380 Times in 372 Posts
|
Re: Water bubbling..
Do you mean you hear bubbling, did you bleed the cooling system properly, could be air trapped. I had the same truck, never was happy with it, ok, this started after the water pump job, no?
__________________
|
|
01-22-2018, 10:30 AM | #4 | |
AF Newbie
Thread starter
Join Date: Sep 2007
Location: Verona
Posts: 81
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Water bubbling..
I am not that lucky usually... I wish it has just to be purged..
By the way, all the job started due to bubbling so I guess in that time system was purged properly, nobody touch the engine until now. What about purge it? Is there a procedure or shall I just drive and wait for reservoir tank and radiator cap doing their job? |
|
01-22-2018, 10:32 AM | #5 | |
AF Newbie
Thread starter
Join Date: Sep 2007
Location: Verona
Posts: 81
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Water bubbling..
I forgot, I also replaced radiator cap with a new ac delco one.
|
|
01-22-2018, 11:42 AM | #6 | |
AF Enthusiast
Join Date: Dec 2001
Location: clarksville, Tennessee
Posts: 1,718
Thanks: 26
Thanked 185 Times in 181 Posts
|
Re: Water bubbling..
Park it nose uphill. Remove rad cap. Put heater on full. Run the car.
__________________
Post back, that's what makes Forums Work. |
|
01-22-2018, 12:03 PM | #7 | |
AF Newbie
Thread starter
Join Date: Sep 2007
Location: Verona
Posts: 81
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Water bubbling..
Ooook, let's try then. I'll write back.
Thanks |
|
02-05-2018, 01:04 AM | #8 | |
AF Newbie
Thread starter
Join Date: Sep 2007
Location: Verona
Posts: 81
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Water bubbling..
Not lucky, even after cooling system bleeding engine still bubbles. Reservoir tank was a bit under pressure also..
What do you suggest? New radiator or straight to head gasket? |
|
02-05-2018, 07:19 PM | #9 | |
Registered Offender
Join Date: Mar 2006
Location: Rural
Posts: 6,548
Thanks: 7
Thanked 345 Times in 340 Posts
|
Re: Water bubbling..
If the cooling system is generating bubble while running (with the cap removed) it's a good bet that there is a compression leak somewhere.
__________________
Permanent seat assignment on the Group W bench... Automotive Forums Survival Guide |
|
02-07-2018, 11:15 AM | #10 | |
AF Newbie
Thread starter
Join Date: Sep 2007
Location: Verona
Posts: 81
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Water bubbling..
It actually bubbles when I drive it for at least half an hour, as soon as I turn off the engine. Radiator it's not hot everywhere but mostly at the top close to the inlet hose. Going down with my hand i feel it gets cooler but I don't know if this is normal (due to fan) or not.
|
|
02-19-2018, 12:44 AM | #11 | |
AF Newbie
Thread starter
Join Date: Sep 2007
Location: Verona
Posts: 81
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Water bubbling..
Replaced radiator and still no result. I guess now head is coming off.. what do you think?
|
|
02-22-2018, 02:31 PM | #12 | |
AF Newbie
Thread starter
Join Date: Sep 2007
Location: Verona
Posts: 81
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Water bubbling..
My mechanic took a look deeper and I was told to try to take out thermostat but I have seen it is underneath and not on the head.. lost my time tonight.
I will keep working next days but in the end it make sense.. if thermostat is after radiator in water flow it could be the cause of my defect.. ain't it?? |
|
02-22-2018, 05:54 PM | #13 | |
AF Enthusiast
Join Date: Dec 2001
Location: clarksville, Tennessee
Posts: 1,718
Thanks: 26
Thanked 185 Times in 181 Posts
|
Re: Water bubbling..
Just because it is lower does not mean it is flowing the opposite direction. It may be a thermostat issue. But the coolant heats in the engine until the thermostat opens flowing into the radiator and back through. Look on Youtube. Bunch of thermo replacement videos for your trailblazer.
__________________
Post back, that's what makes Forums Work. |
|
02-22-2018, 11:40 PM | #14 | |
AF Newbie
Thread starter
Join Date: Sep 2007
Location: Verona
Posts: 81
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Water bubbling..
Thanks.. I will look right now. I don't work in a garage but I have never seen thermostatic valve on the engine block..
|
|
02-23-2018, 12:00 AM | #15 | |
AF Newbie
Thread starter
Join Date: Sep 2007
Location: Verona
Posts: 81
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Water bubbling..
Seen a video.. not a fun job.. The guy replaces it with a new one but I would like just to take valve out as a test. Do you know if old thermostat comes off the alu pipe and I can still put it back on with its O ring but as an empty pipe?
|
|
|
POST REPLY TO THIS THREAD |
|
|