Overheating Issue

[Robin Toor]

When driving the car once its fully warmed up, the temperature guage goes about 3/4 of the way up when reving at about 3000rpm. When bringing the revs down, the guage goes down to almost half, and if putting the car in neutral and bringing the revs down to an idle, the guage goes right back to half.

Both fans are working. I'm thinking it might be low on coolant so I'll fill up the overflow bottle so the system can take it from there. The guage goes higher as the revs go up.

Any ideas to what this could be?

[Fraser Cassells]

Best case senario, like you said low on coolant. Maybe burp it a bit and put it to bed.

but..When you overheat are you pushing coolant into the overflow? HG could be kaput. Look for pinhole leaks that would account for water loss, its gotta go somewhere if you arn`t mixing it or eating it.

[mike griffin]

is this with the new one? steve said something about it overheating after the 16g install.

[Artem Goloubov]

Signs of BHG (blown head gasket)

1. Never ending bubbles when burping.
2. Coolant inside the cylinders after driving, just remove the plugs and see with flash light.
3. Numerous coolant overflow thru the overflow bottle.
4. Lose of heat inside the car (due to air in the cooling lines).
5. Rough idle or miss on cylinder due to water inside the cylinder.
6. Car overheats under load highway driving/uphills

Although BHG on Talons is not as common as on Supras, it still blows due to high boost/detonation.

I'd change the thermostat and burp the coolant lines, if the problems remains do a compression test (cylinder with blown gasket will have lower compression). You could also buy a kit from NAPA that will test presents of exahust gases in coolant.

Art

[Ryan Lore]

438whp

I'm thinking gasket.

[Robin Toor]

Not too sure if the coolant was being pushed into the overflow. Oil is nice and black with no traces of coolant... coolant is brownish yellow but I believe that is because the new yellow type coolant was put in it.

I just filled up the coolant with water, it took 2 full 8oz cups. Seems like there is alot of air in the system since pushing on the rad hose would cause air bubbles to come out.

The heat inside the car does go from cool to warm from time to time. If I crank the heat all the way up the car does not over heat, the guage stays right at half.

Did a leak down test today, nothing was over 4%, except cylinder #4 was at 10%, so compression seems fine.

And this wasn't in my red talon, I just picked up a new talon (Steve Girard's) in trade of my truck, so its that car.

Think it's blown headgasket or something simple as blockage or system needs to be burped? I filled up the coolant in the system and overflow bottle so it can burp tommorow, hopefully that'll solve the problem.

[Dilvinder Grewal]

hey robin, mine did that during the summer, so i got the rad flushed,and put a new thermasat in it and it still overheated, so then some guy was like try changin the rad cap and i was like wat the hell might as well, once i changed it, it never overheated again so maybe try it..... good luck

[trevor_Shiggs]

i got a coolant question
how high is the guage suppoest to go before the thermostat opens.
Mine goes 3/4 the way up before the thermostat opens.

[Robin Toor]

i got a coolant question
how high is the guage suppoest to go before the thermostat opens.
Mine goes 3/4 the way up before the thermostat opens.

I think that is ok for now, mine seems to be like that also. Some cars like to run hotter, you get better gas mileage like that. As long as you don't get into the red zone you won't warp the head. I hear anywhere between 1/2 and 3/4 is fine, past that is warping head zone.

[John Hartman]

Robin, check the t-stat if getting all the air out doesn't fix it for ya.

Hey, its simple and cheap.

And as for the coolant colour, thats just dirty, sludgy, "flush me" coolant.  Even Dexcool isn't that colour, its a nice pink.

[Kevin Klapwijk]

Turn up the heater full blast with windows down to release some heat from the engine.

[Matt Demick]

Ok done this before. Either your thermostat is shot, air in ur system ( bleeding it takes not even 10 min, or your rad cap is dead. Highly doubt with ur leak down test it a headgasket. I do have a compression tester i ya want to borrow it. I'm home all day every day just hit up my cell

[Andrew Steele]

"brown coolant"  :rofl:

[John Hartman]

HAhaHAHA!  I didn't even catch that!!

[Robin Toor]

UPDATE:

Seems the coolant flush, t-stat and rad cap change fixed the problem. Needle doesn't creep up past half now, all looks good :thumbs: