wtf i'm boiling over?

[americanjebus]

yea has anyone had their car go from being normal temp non boiling coolant to boiling out of the overflow just from heatsoak.

i understand the fundamentals and i know its my high altitude and heat soak but what can i do to avoid losing a pint of coolant with every trip? im getting an aftermarket tranny cooler to take some of the heat away.

TOTALLY OF SUBJECT. but

what does an auto tranny sound like when its going bad, as in torque converter starting to fail, clutches wearing out, flywheel damaged, just it just sound like metallic chatter? or is like suctioned slipping sound. or grinding?

i got the really subtle screw in cofee can sound like its deep inside my belhousing but i can barely hear it. and a little dab of oil leeking. could oil cause the sound too?

 

[bigaaron]

Sometimes the bhg is only bad enough to force exhaust pressure out when under boost, in that case the block test would show no problems. There is really no other way it would force coolant out unless you had a leak (you would see coolant on the ground), or if the water pump was bad (you would be overheating bad). If the coling system is working properly, burping the system is not needed, the cooling system does that on its own when it cools down while parked. Usually on a 7m when there are overheating issues or an over pressurized radiator, it's a bhg. The stock water pumps are pretty good and usually only fail when you use water with no coolant.

 

[boost fiend]

well then i guess its time to look into a new water pump. i can get a new one really cheap. might as well call arp and get head studs and get ready to order the mhg. i erally hate having to put my baby up.....

 

[mcpcola]

I had the same problem right after buying my car so far i did a water pump, rad hoses, radiator, fan clutch, Fan, thermostate, Radiator cap it still happened so i removed the thermo now it only happens while on the interstate. I suspect it the HG but i am waiting to rebuilt the entire motor all at one time

 

[TONY!]

How high were you up the hill? Maybe altitude has something to do with it.

When I first read that, I said, huh?!
I think you mean at higher elavations, the air gets thinner.
Thinner air is not as efficient at cooling a radiator than denser air.

As an example, compare the extremes of fluids:
Water (another fluid) has excellent heat dispersing qualities because it is more dense.
In a vacuum or close to it, there will be none to very little heat transfer because it is not dense at all.

At very high elevations, it is sort of a combination of being in a vacuum to being where most of the population drive their cars.

At high elevations a cooling system would not work efficiently -- that would hold true, but I really can't tell say at what elavation that occurance will really start to take effect.

 

[TONY!]

Sometimes the bhg is only bad enough to force exhaust pressure out when under boost...

Very true. Intermittent [leaks from a] BHG do exist! This information needs to get around because way too many people think that a compression test is a sure way to diagnose a BHG -- I really would like to kill that misconception.

Sometimes the bhg is only bad enough to force exhaust pressure out when under boost, in that case the block test would show no problems...

Now that part I am having difficulty with. A block test will check for carbon in the coolant. You don’t need to have an open leak all of the time, even an intermittent BHG leak will put carbon in the coolant.

EDIT:to add below and to add the words in the bracktes for clarity: [leaks from a]

I guess the "debate" then goes towards: exactly how sensative is a block test to carbon in the coolant. I can't exactly say how sensative it is from my own experience as I have not diagnosed hundreds of cases, but I have heard that the test is very sensative to carbon, and that it will pick up even small quantaties of carbon present.

 

[americanjebus]

im at 900ft in town and 2200 going over the mountains and i did spill a bit this time but now i have a tranny cooler on so its runnign slightly cooler and i didnt boil it amazingly doing 4500 rpm up 2200 ft in the rockies.

 

[bigaaron]

I had a blown mhg and it passed the first block test. It was filling the overflow bottle after boosting, and that was the only symptom until the one day it made enough pressure in the cooling system under boost to blow the seal out of the radiator. On a stock hg, that is a little less likely.

 

[bigaaron]

So I guess I would agree that a bhg passing the block test is rare.

 

[TONY!]

Very interesting indeed.

 

[trixkid]

could be a bhg maybe not. i would have the same prob with the colant boiling but then the motoer would be shaky and shit but you dont have the prob do you but why are you using the red colant? did you allways use red colant or did you switch over cuz if you did that mite be the prob if you rebilt the entire motor and then used red colant then it would be ok now i hop when you said red koolade you mean red colent if now then i wasten some time posting this lol

 

[americanjebus]

im running red TOYOTA COOLANT not koolaid, just figure of speech. i fairly sure its not bhg i know the symptoms and have dealt with it. if it was air in my system then i would boil over everywhere even going to work but i only do it in 90+ weather under load up this mountain where yea it gets reallly hot. otherwise perfect. and it stopped when i did the tranny cooler so i know it was just excess heat from engine+ambient+ and tranny fluid.

car has always had toyota coolant, previous owner was only owner and pretty rich and he only had it serviced at toyota. the thing had a toytoa oil filter on it. i did hg but thats it.

i geuss the final solution to the problem in this thread is that i need and everyone doign uphill climbs in hot weather is,
let your car idle for a few mintues, a few seconds doesnt cut it in high elevations, let your a/c fans do their thing, and if possible you can do what i did and add an additional oil cooler for trans, (if auto).

 

[bigaaron]

Mine used to heat up on really long steep grades when I had the flexalite fans, I went back to stock and no more problems.

 

[boost fiend]

no, a block test is NOT a surefire way to test for a bhg. but im on a diffrent idea now. im gonna clean out the fins tonight and see if that helps or not. i found a stock radiator and might put that in this weekend.

 

[GrimJack]

Have you unbolted the top radiator supports and leaned the rad back to see if it's got leaves and junk clogging it in the front? This has happened to a fair number of members...

 

[Lost_Supra]

i had this problem and replaced everything except the radiator.. then changed teh fan clutch and the problem went away.. unless i go on long trips.. but in traffic it's not bad.. if you can turn the fan with your hand and it show little resistance then it's bad. Engine off of course..

 

[boost fiend]

well, i cleaned out the fins and it seemed to help out just a little bit. not enough for my likeing though. so now i guess im off to do the head gasket again and see. my question though is should i use head bolts or studs??? i dont plan to do this again, but i do plan to run about 15 psi after i fix it? any ideas??? :icon_conf

 

[GrimJack]

Bolts are more than sufficient for 15psi.

For the difference in cost (not much) why not just go for the best anyhow?

 

[boost fiend]

i can get arp bolts for about $95 and the stud kit for about $115. im thinking about just going with the studs incase i decide to go more aggresive with it. :naughty: