Low Coolant, Heater, and Vacum...

[dumbo]

ok...
i bought my car and the Heater control valve has all kinds of crystally, dry powedry residue, dried coolant pretty sure.
plus one other fittering on that line, has a hose connection prolly for flushing coolant.

I can never see coolant coming out there, but could it dry so fast that i dont see anyliquid or steam??? but sometimes do smell a bit of coolant, somtimes.

the bird cage light comes on every few days, drive 100km/day for work bear in mind. top it up and go on.
Doesn't overheat, temp always constant half,always. NO white residue in oil anywhere, just changed it. cant see coolant coming out anywhere, except crystally residue on HCV and other fitting.

Not sure if it could be related?

The HCV doesn't move when i chane the interior temp, goes hot for about 5 seconds then goes cool on its own
I got a 86.5 7M-GE and the three small vacum lines on the throttle body have no vacum at idle, at about 2-3g RPM, 2 of the 3 do, 2 front ones. i know 2 of these control the HCV valve(rear 2), wich i can manually move and it turns heat on.

OK sorry bout the long post, little details are important i tihnk.

Please any ideas/help:1zhelp:

 

[Supraboy89]

need pics

 

[Supraboy89]

i believe the hcv is supposed to have vacc all the time. not sure about the 86 models though but it should be a electronic hcv. need pics though

 

[dumbo]

here are some pics-they vacum ports on the left side(rear 2) go to that valve, not sure what it is? and then eventually go to the HCV- other pic- that dryed crystally stuff must be coolant. on the vacum port pic- the one in the front goes to the thermostat housing and then to the charcoal canister i think.

 

[vas85]

I had a similar issue, it looked all like that crystally-like but it was nothing terminal/major, as it would have leaked about 5-10mill of fluid every 1-2monts or so... but I replaced the heater valve unit with a brass configuration.

What I had wrong with mine is a crack in the unit where the screws wind in... could be a similar case with yours, and I think being in the US you guys have the unit on the exhaust/turbo manifold side... which would have even more heat for a plastic unit to handle.

 

[dumbo]

well i figured out my heater problem, its the solenoid valve(guess i had vacum all a long cause i bypassed the VSV i think its called, and heat works damn good)

so i left the garage(cold-bout 20 degrees celsious) with coolant at 'full' got home coolant was at 'full'
wouldn't it go higher?? was a driving long enough to get there. my rad cap is a 13psi cap, i let it cool down for maybe 2 hours, rad still warm to touch, coolant still at 'full', pulled the tube out of the overflow, let it idle for 20 minutes or so switching from full hot, for first 5-10min, on a hill (nose up) and then ac-full cold-just to heat the eninge up- temp gauge wouldn't move AND NO COOLANT WOULD COME OUT OF OVERFLOW TUBE, is it not getting to 13psi-is rad cap fubar??? top rad hose is ROCK hard. gonna get a new HCV and VSV(solenoid) from toyota, its a holiday in alberta today, so i'll call tomorrow.

i cant see it being a bhg, no coolant smell from exaust on startup, no water dripping from tail pipe, no water in oil, or oil in coolant, runs/idles perfect and no other signs of bhg.plus rebuilt with decked head/block metal hg, and retorgued.

i'm going nuts here:icon_evil

 

[Supraboy89]

if you just crank your car up after it has been cooling down for 2 hours and your coolant is full and your upper hose becomes rock hard. sounds like bhg to me. your upper hose shouldnt get hard when the car is just sitting there idleing.

 

[dumbo]

if you just crank your car up after it has been cooling down for 2 hours and your coolant is full and your upper hose becomes rock hard. sounds like bhg to me. your upper hose shouldnt get hard when the car is just sitting there idleing.

no it takes a while to get hard, when it heats up right, 13psi is a bit of pressure right, do you think the ehaust gas could be pressurizing the coolant system?? and if it did wounldn't it blow out of the overflow??


i'm at a total loss, blown a HG before, not a Supra, but engines are engines. i'll keep at it got a new hose and HCV valve/solenoid so now i'll take them out of the situation. please give me more info supraboy.