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#4644410 - 01/23/18 08:10 PM Coolant expansion tank boiling
Emanuel Offline


Registered: 07/01/17
Posts: 183
Loc: 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


Edited by Emanuel (01/23/18 08:21 PM)

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#4644443 - 01/23/18 08:32 PM Re: Coolant expansion tank boiling [Re: Emanuel]
tig1 Offline


Registered: 01/03/09
Posts: 13657
Loc: Illinois
Blown head gasket?
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#4644448 - 01/23/18 08:35 PM Re: Coolant expansion tank boiling [Re: Emanuel]
KneeGrinder Offline


Registered: 11/28/17
Posts: 221
Loc: 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.
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#4644452 - 01/23/18 08:37 PM Re: Coolant expansion tank boiling [Re: KneeGrinder]
Emanuel Offline


Registered: 07/01/17
Posts: 183
Loc: 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.

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#4644454 - 01/23/18 08:39 PM Re: Coolant expansion tank boiling [Re: Emanuel]
Emanuel Offline


Registered: 07/01/17
Posts: 183
Loc: Venezuela, South America
I think that the engine needs the thermostat because it creates a restriction so bubbles can form in the cooling jackets

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#4644458 - 01/23/18 08:43 PM Re: Coolant expansion tank boiling [Re: Emanuel]
mk378 Offline


Registered: 09/27/15
Posts: 1416
Loc: 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.


Edited by mk378 (01/23/18 08:52 PM)

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#4644466 - 01/23/18 08:57 PM Re: Coolant expansion tank boiling [Re: Emanuel]
KneeGrinder Offline


Registered: 11/28/17
Posts: 221
Loc: 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"
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#4644469 - 01/23/18 08:59 PM Re: Coolant expansion tank boiling [Re: Emanuel]
eljefino Offline


Registered: 06/15/03
Posts: 32632
Loc: 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.

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#4644496 - 01/23/18 09:26 PM Re: Coolant expansion tank boiling [Re: Emanuel]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1345
Loc: 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...


Edited by PeterPolyol (01/23/18 09:28 PM)

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#4644507 - 01/23/18 09:37 PM Re: Coolant expansion tank boiling [Re: Emanuel]
Ducked Offline


Registered: 10/25/12
Posts: 4336
Loc: 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.

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#4644523 - 01/23/18 10:04 PM Re: Coolant expansion tank boiling [Re: Emanuel]
Ducked Offline


Registered: 10/25/12
Posts: 4336
Loc: Taiwan
Venezuela

Apologies; that was sloppy.

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#4644541 - 01/23/18 10:48 PM Re: Coolant expansion tank boiling [Re: PeterPolyol]
Silk Offline


Registered: 07/26/03
Posts: 4552
Loc: 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.
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#4644555 - 01/23/18 11:26 PM Re: Coolant expansion tank boiling [Re: Emanuel]
Chris142 Online   content


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
Replace the radiator cap.
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#4644567 - 01/24/18 01:24 AM Re: Coolant expansion tank boiling [Re: Emanuel]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7475
Loc: 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.

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#4644581 - 01/24/18 02:43 AM Re: Coolant expansion tank boiling [Re: OneEyeJack]
Ducked Offline


Registered: 10/25/12
Posts: 4336
Loc: 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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