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Radiator Cap
Topic Started: Jan 6 2012, 08:35 PM (1,470 Views)
Skitzso
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Stock
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My brother in law is having over heating problem since his last service, they changed the radiator cap( for what reason i dont know) its a cheap 0.9 is this suitable

he has a rs200

The cap in mine is 1.1 (same motor)

any info would be great
cheers
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ke_70
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yeah high pressure rad cap will make it run cooler.

i doubt it would overheat due to the rad cap though... mabey they put to much coolant mix in too? that could make it put over?

lend him your cap and go for a drive?
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Skitzso
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Cheers i think its got bigger issues now, he just turned up and the radiator is empty and boiling
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lvSTRNG
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When u say empty and boiling is it that the overflow is boiling and radiator empty??

As far as the cap he needs a 1.1 or 1.3 as the 0.9 won't hold the required pressure in the system. Let him change the cap first to a new 1.1 and see if problem persists cuz an incorrect or failed cap can indeed cause overheating symptoms to persist. Start with cheaper repair and move upward.
Be Champions!!!
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Skitzso
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The overflow was empty and most of the radiator I could hear the water in the bottom boiling after it cooled down the radiator took about 4L
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lvSTRNG
Soccer Mom
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If both are empty it is probably the cap causing the issue or he has a leak somewhere. Check to ensure both fans are coming on by turning on ac to eliminate faulty fans or switch.

Is it over heating in traffic but cooling as you are moving?

For what it is worth tho the cap seems the likely source of the problem but remember to burp system as you fill it up cuz the air pockets can give the symptoms as well
Be Champions!!!
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Tezz-Winnie
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As mentioned .9 is too low. Lowwer pressure means the coolant can boil at a lowwer temperature and if he isnt running 50:50 coolant/water then its most likely he has boiled away his coolant.

Get a 1.1 Radiator cap and put 50:50 coolant through and see how that goes. I recon it will be fine after that otherwise the thermostat has probaly had it
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ke_70
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i'd put a 20/coolant 80/water and get a 1.3 cap.
mabey alittle more coolant if you wish

more water less coolent will make it run cooler but hit boiling temp lower. but a higher rated cap will raise it back up
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MightyTeza
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Jedi Master
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I've got a Red Blitz Radiator Cap for $18 if your interested? 127kpa 1.3kg/cm. Just has minor scratching on top and a hardly noticeable tiny dent ;)
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yojimbo
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On the subject of coolant - dont use anything but the toyota factory red coolant, mix as per instructions on the bottle. It is cheap and works much better than anything you can buy from your average retailer.

Flush thoroughly first if there has been some other sort of glycol mix in there as Ive heard you can't mix them.

Toyota Nats 5 x Top Toyota
Toymods Dyno Day 19 - Killerwatt King
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Skitzso
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Thanks for all the info. Just dropped it off at Toyota they doing a pressure test and refilling with new 1.3 cap
I will let you know what they say
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Tezz-Winnie
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Well in that case Toyota will undoubtedly fill with a 50:50 solution wich is pointless with your radiator cap. I would drain half and fill the rest with distilled water. This should give you a 25:75 coolant to water ratio. This ratio WILL boil at a lowwer temperature but because your running at a higher pressure it will still boil outside of normal operating conditions.
Benifits of this is your engine will run much cooler as the best coolant for your engine is actually water (filling with 100% coolant is a terible idea as its only ment to inhibit rust and freezing/boiling)
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yojimbo
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Hidden Dragon
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OMG - bullshit bells are ringing again - I think you can trust the dealership to put the right ratio of coolant concentrate and water in your radiator. Having paid for their expertise and high quality product I wouldn't mess with it. If that doesn't fix the problem, then it is time to look at other possibilities.
Toyota Nats 5 x Top Toyota
Toymods Dyno Day 19 - Killerwatt King
Supra Dyno Day 2015 Outright HP and Torque
11.10@141.34mph (0-400m)
22.048@164mph (0-1000m)

Built by ...
JMR Race Engineering - Toyota Specialist
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Tezz-Winnie
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Your kidding right? Your telling me a massive corperate company that has strict service guidlines to follow (and a big drum of premix coolant) is going to put anything less than 50:50 coolant?

How is anything I said bullshit?
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yojimbo
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Hidden Dragon
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Stop making shit up.
Toyota Nats 5 x Top Toyota
Toymods Dyno Day 19 - Killerwatt King
Supra Dyno Day 2015 Outright HP and Torque
11.10@141.34mph (0-400m)
22.048@164mph (0-1000m)

Built by ...
JMR Race Engineering - Toyota Specialist
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Tezz-Winnie
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Your full of yourself. End of story im not even going to justify my time to prove myself because I dont have to. The only reason I did in the first place is to actively contribute my knowledge as a RAAF trained technician to the forum but to be called out as a bull shit artist who makes shit up without justification thats uncalled for. Your a joke Matt plain and simple
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yojimbo
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Hidden Dragon
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I think you mean "you're". Plus you're an electronics tech, stick to what your supervising engineer tells you.
Toyota Nats 5 x Top Toyota
Toymods Dyno Day 19 - Killerwatt King
Supra Dyno Day 2015 Outright HP and Torque
11.10@141.34mph (0-400m)
22.048@164mph (0-1000m)

Built by ...
JMR Race Engineering - Toyota Specialist
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lvSTRNG
Soccer Mom
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@Skitzso - any word on the work done at the dealership? problem solved?
Be Champions!!!
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Tezz-Winnie
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No im a dual trade Avionics Technician and Electronics Technician both cert VI and to me they are pieces of paper my experience is more valuable to me none of which you know. So unless you know the CASA learning out comes for an ADF Avionics technician stop pretending like you know me (this included 3 months of fitting and turning and 2 months of mechanical engineering 8 hours a day 5 days a week). Right now I am one step away from being an engineer, I work in the medical industry and Im supervised by nobody, remember that next time you go to hospital ;)

Oh and you seem to know allot for someone who paints lines on roads. I read that on the intranets :) Its amazing how much info you can find on the internet. Seems everyone leaves a trail of some sort.
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yojimbo
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Hidden Dragon
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Lol, The only lines I've ever painted on the road were 275mm wide and black, you fail at intranets.
Toyota Nats 5 x Top Toyota
Toymods Dyno Day 19 - Killerwatt King
Supra Dyno Day 2015 Outright HP and Torque
11.10@141.34mph (0-400m)
22.048@164mph (0-1000m)

Built by ...
JMR Race Engineering - Toyota Specialist
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yojimbo
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Hidden Dragon
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Funny you say we should accept your advice as you have TWO unrelated trades. All I've ever reccomended is to keep things simple and if you dont know something seek qualified advice ( and stick to it) or fit OEM Toyota stuff, which is the best engineered parts and consumables available for our cars bar none.

Before you have "nothing to prove", generally you have to have proven something / anything first. I've got runs on the board with this make and chassis, i don't brag, im not of the opinion everyone should do what i do, and i rarely offer unsolicited advice but im always happy to answer questions based on my experience. What can you say you've achieved? Bedsides filling every tech thread with utter bullshit.
Toyota Nats 5 x Top Toyota
Toymods Dyno Day 19 - Killerwatt King
Supra Dyno Day 2015 Outright HP and Torque
11.10@141.34mph (0-400m)
22.048@164mph (0-1000m)

Built by ...
JMR Race Engineering - Toyota Specialist
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Tezz-Winnie
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Alright so this is because you dont belive a 1:1 ratio runs cooler then a 1:2 ratio of coolant to water at 1.3bar?

Whats the point of running at higher pressure then?
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Tezz-Winnie
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Avionics trade involves aircraft hydrolic and air conditioning pressurisation system servicings so yea I actually do know a fair bit about this particular topic. So once again stop pretending like you know me
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alimac
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Canterbury, NZ
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Surely the temperature the engine runs at is governed by the thermostat. A higher pressure radiator cap will raise the boiling point meaning that the engine can run hotter without the coolant boiling. Basic physics.
Yellow RS200z 6MT
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yojimbo
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Hidden Dragon
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^^ this. It really is that simple. If you need a lesson in vapor pressures, or basic physical chemistry I can reccomend a good tutor.
Toyota Nats 5 x Top Toyota
Toymods Dyno Day 19 - Killerwatt King
Supra Dyno Day 2015 Outright HP and Torque
11.10@141.34mph (0-400m)
22.048@164mph (0-1000m)

Built by ...
JMR Race Engineering - Toyota Specialist
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