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Coolant expansion tank boiling #4644410
01/23/18 08:10 PM
01/23/18 08:10 PM
Joined: Jul 2017
Posts: 187
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 187
Venezuela, South America
I have a 01 Corolla with almost 290k miles, itīs thermostat have been removed I know that I should buy and put one again but I canīt afford it and I will stick with the consequences, I live in Venezuela and hyperinflation is crazier than you will ever be able to imagine so please focus on the rest of the post:

- The car doesnīt have any problems on under 60 minutes drives.
- It doesnīt overheats in heavy traffic in the middle of day when the ambient temp and solar radiation are crazy.
- After long journeys the coolant in the expansion tank is boiling and I can feel bubbles in the upper radiator hose.
- In long journeys the coolant temp is very low because there is no thermostat.
- The car has good torque and I have tested opening the radiator cap to see if there are combustion gases in the cooling system and everything looks fine, it doesnīt have a blown headgasket.

Is my car overheating?
Can a car overheat even when the coolant temp is very very low?
Are bubbles in the upper radiator hose normal?

Thanks

Last edited by Emanuel; 01/23/18 08:21 PM.
Re: Coolant expansion tank boiling [Re: Emanuel] #4644443
01/23/18 08:32 PM
01/23/18 08:32 PM
Joined: Jan 2009
Posts: 13,975
Illinois
tig1 Offline
tig1  Offline
Joined: Jan 2009
Posts: 13,975
Illinois
Blown head gasket?


2007 Ford Fusion 235,000 miles
M1 0-20 EP
2017 Ford Fusion 60K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and Valvoline LV
M1 10-30 in all OPE
MC filters

Re: Coolant expansion tank boiling [Re: Emanuel] #4644448
01/23/18 08:35 PM
01/23/18 08:35 PM
Joined: Nov 2017
Posts: 380
North of you Idaho
KneeGrinder Offline
KneeGrinder  Offline
Joined: Nov 2017
Posts: 380
North of you Idaho
Do you have an overflow bottle with a small hose line feeding it from the radiator just below the radiator cap?

Do you, or have you added any coolant or water to the radiator? or overflow bottle?

Bubbles are not ok. They are not normal.


08 Tribeca 86k PUP 5w30 wix
06 Accord Hybrid 134k PPHM 0w20 wix
02 Chevy k3500 99k Delvac 1 esp 5w40 wix
00 F350 136k Delvac 1300 15w40 wix
Re: Coolant expansion tank boiling [Re: KneeGrinder] #4644452
01/23/18 08:37 PM
01/23/18 08:37 PM
Joined: Jul 2017
Posts: 187
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 187
Venezuela, South America
Originally Posted By: KneeGrinder
Do you have an overflow bottle with a small hose line feeding it from the radiator just below the radiator cap?

Do you, or have you added any coolant or water to the radiator? or overflow bottle?

Bubbles are not ok. They are not normal.


I was confused when I said coolant expansion tank, it has a overflow tank. When the radiator cap reaches certain pressure the coolant goes into this overflow tank.

Re: Coolant expansion tank boiling [Re: Emanuel] #4644454
01/23/18 08:39 PM
01/23/18 08:39 PM
Joined: Jul 2017
Posts: 187
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 187
Venezuela, South America
I think that the engine needs the thermostat because it creates a restriction so bubbles can form in the cooling jackets

Re: Coolant expansion tank boiling [Re: Emanuel] #4644458
01/23/18 08:43 PM
01/23/18 08:43 PM
Joined: Sep 2015
Posts: 1,594
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,594
USA
Before each trip, when completely cold, open the radiator cap and confirm the radiator is full to the top. The expansion tank should be about 1/3 full, or to the "FULL COLD" line if it has one.

If it stays cool on the highway, the radiator fan may not be working. That causes overheating when sitting still or in slow traffic.

Last edited by mk378; 01/23/18 08:52 PM.
Re: Coolant expansion tank boiling [Re: Emanuel] #4644466
01/23/18 08:57 PM
01/23/18 08:57 PM
Joined: Nov 2017
Posts: 380
North of you Idaho
KneeGrinder Offline
KneeGrinder  Offline
Joined: Nov 2017
Posts: 380
North of you Idaho
Your goal will be to evacuate all air out of the coolant system. Like post above says, start with filling radiator upon every cold start.

"No air bubbles around and cooling jacket or anywhere else"


08 Tribeca 86k PUP 5w30 wix
06 Accord Hybrid 134k PPHM 0w20 wix
02 Chevy k3500 99k Delvac 1 esp 5w40 wix
00 F350 136k Delvac 1300 15w40 wix
Re: Coolant expansion tank boiling [Re: Emanuel] #4644469
01/23/18 08:59 PM
01/23/18 08:59 PM
Joined: Jun 2003
Posts: 33,560
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,560
ME
It could be the radiator cap is no good. This keeps pressure on, and prevents boiling.

Are you running 50/50 coolant or is there more water in there?

I'd say, yeah, you're overheating.

Maybe the water pump is no good?

If you have bubbles in the upper hose, your radiator fan should be running, and you should feel the car throwing off a lot of heat if you stand by the driver's door. If it isn't, you aren't getting water flow to or through the radiator, the fan is weak, etc. Similarly, turn on the heat inside and run the fan high, it should roast you out of there.

Re: Coolant expansion tank boiling [Re: Emanuel] #4644496
01/23/18 09:26 PM
01/23/18 09:26 PM
Joined: Mar 2016
Posts: 1,557
Toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,557
Toronto
Having no thermostat is bad news. It not only regulates flow to the rad but when it opens, it closes the bypass circuit. No thermostat means the bypass is fully open along with the radiator and so coolant flow is unpredictable. Find a tstat asap, even a used one if you have to...

Last edited by PeterPolyol; 01/23/18 09:28 PM.

Scambling for solutions is a hopelessly futile endeavour and potentially dangerous, without first coming to a solid, personal understanding of the problem. Beware riding the ideological hobby horse.
Re: Coolant expansion tank boiling [Re: Emanuel] #4644507
01/23/18 09:37 PM
01/23/18 09:37 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
Taiwan
Originally Posted By: Emanuel

- The car has good torque and I have tested opening the radiator cap to see if there are combustion gases in the cooling system and everything looks fine, it doesnīt have a blown headgasket.



How do you know this?

I have some evidence of bubbling into the expansion tank, and I suspect I have a blown head gasket, but its slight, intermittant and so far doesnt seem to be getting ant worse.

Yesterday I tried working a plastic bag full of coolant into the overflow tank and everting it.

The idea is that if its blowing combustion gases through the tank the bag will trap some of the bubbles.

If its blowing steam, it won't, because the steam will re-condense.

Tricky to get the bag to evert neatly so I dunno if it'll work. Yesterday it didn't seem to catch anything.

The usual "First World" advice is to get a chemical test for combustion gases. Dunno if that's available here (in Taiwan) or in Venesuala, or how I would ask for it here, or how much it'd be likely to cost.

Re: Coolant expansion tank boiling [Re: Emanuel] #4644523
01/23/18 10:04 PM
01/23/18 10:04 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
Taiwan
Venezuela

Apologies; that was sloppy.

Re: Coolant expansion tank boiling [Re: PeterPolyol] #4644541
01/23/18 10:48 PM
01/23/18 10:48 PM
Joined: Jul 2003
Posts: 4,895
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,895
New Zealand
Originally Posted By: PeterPolyol
Having no thermostat is bad news. It not only regulates flow to the rad but when it opens, it closes the bypass circuit. No thermostat means the bypass is fully open along with the radiator and so coolant flow is unpredictable. Find a tstat asap, even a used one if you have to...


This - if your thermostat has a poppet valve, it also controls the bypass circuit...coolant will be doing a loop in the bypass (often the heater) and not going through the radiator.


1987 BMW R65 - Aegis SAE30
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Coolant expansion tank boiling [Re: Emanuel] #4644555
01/23/18 11:26 PM
01/23/18 11:26 PM
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,815
Deplorable in apple valley, ca
Replace the radiator cap.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Coolant expansion tank boiling [Re: Emanuel] #4644567
01/24/18 01:24 AM
01/24/18 01:24 AM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
S California
The thermostat slows the coolant down so that it spends enough time in the radiator to cool down.

Many also control a bypass circuit as suggested above.

Can you use the Internet to get one from Florida? Working out getting one will be cheaper in the long run than paying for the damage in the short run.

Re: Coolant expansion tank boiling [Re: OneEyeJack] #4644581
01/24/18 02:43 AM
01/24/18 02:43 AM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
Taiwan
Originally Posted By: OneEyeJack
The tjavascript: void(0)hermostat slows the coolant down so that it spends enough time in the radiator to cool down.



This seems very unlikely.

I'd think the radiator will remove heat at a rate determined by the air flow from the fan plus forward movement and the temperature differential between the coolant and the air.

If the coolant goes around faster, the temperature differential will be maintained at a higher level, so more heat will be removed.

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