View Thread: Overheating


TURBOZ
WTF? The Z is overheating....BAD. It's not the fans, or anything that can stop the overheating by driving on the highway. Even on the highway, it's skyrocketing. I put some water in the radiator last night, and drove it home and it was fine. I'm not seeing any leaks or anything, and i drove it this morning to dealership and nothing. I let it idle for like 15 minutes at the dealer and nothing, it was cool as a cucumber. So, I decide to bring it to work, drive away and it overheats before i get out of the parking lot. WTF???

There's some white smoke coming from the tail pipes, but it's got a gutted cat, so i attribute some of that to the smoke. What could be wrong with it?

scubie02
Could be the thermostat malfunctioning periodically. Or the fan is stopping sometimes.

On my old mustang it got to the pount where the radiator wasn't leaking, but so many of the little vanes that serve to dissipate the heat had rusted out it just didn't keep the car cool.

I'd probably start w/ the thermostat, but then I'm not a mechanic, they might have other thoughts.

scubie02
This is still the new Z28, BTW?

lsr78
thermostat. they are cheap and easy to replace (normally, never done one on a z)

TURBOZ
Yeah, the one i just bought. hehe. I replaced the thermostat, so it can't be that. I dropped ti at the dealer, and it's due to a whole bunch of gunk in my radiator. They said a normal flush wouldn't clean it out. They said I need to have it taken apart and cleaned out. Does that sound right? Is there a way i can clean this thing and get it on the road for this weekend.

scubie02
Find out how much it will cost to do this "not normal" cleanout. It cost me less than a $100 to buy a brand new radiator for my mustang and it was easy to change myself. Actually, if I remember correctly it was like $67, though that was a few years ago...probably 7 years or so.

lsr78
More Like $350 for his.

TURBOZ
Ouch. 350 bucks? I don't like that. Isn't there some radiator flush crap i can do to it? The Jiffy Lube down here says they pour some stuff into my motor oil spout, and it cleans everything out. They let the car run fro 5 minutes while draining, and then fil it with new stuff. Costs 50 bucks. Well worth the money if it works, if it doesn't, I'm out 50 more bucks.

silverTA2002
They pour something into your oil that cleans out your radiator?????

I don't get it?

So, what's with the Z? What year, what mods, ect?

scubie02
Yeah, I was going to say I don't see how pouring stuff in the oil spigot was going to clean out your radiator...

They DO have raiator flushes though that it seems like would work. I was just things if it ended up costing $100 or more it'd be better to just buy a new radiator, but if the F-body ones are really that expensive...of course, you might be able to get one in good shape from a junk yard for cheaper...

But it must be really bad if a flush using the solvent stuff or whatever wouldn't work.

lsr78
You need to get a good reverse flush system. Can buy at a local auto parts store. Hooks a hose up to the drain end of your system and blows it out. Maybe $15 but can be hard to find - may have to order it.

You can also have that 'professionaly' done (that is probably what the were talking about.

scubie02
I didn't think most radiators really came "apart" per se, though, unless by "taking it apart" to clean it they just mean take the radiator off or something.

TURBOZ
Well, this is an engine flush they are talking about. Apparently, there is a lot of junk in my coolant system. i'm going to clal another place, i don't see how pouring stuff in the oil spigot is gonna work. I'm going to call around.

The Z is a 93, is't got SLP cold air intake, cam, headers, lifters, roller rockers, ported heads, exhaust, ignition with coil, mccleod clutch, hurst shifer, SS wheels, all that. It's fast as hell, and is strong, but i just have to get the little demons out.

silverTA2002
Sounds like a pretty sweet ride. Have you run it at the track yet??

How is it driving around town with that many mods (other than being loud)?

I'll probably throw a decent cam in my car as soon as the warantee runs out. :)

TURBOZ
It's pretty sweet. Driving around town is a little tricky. I set off car alarms all the time, and the mccleod clutch, if you dont let it out just right, tends to be a little crabby. I have to be real gentle so i dont break the tires loose, but i think i just need new ones. If i can just get this overheating taken care of, it will be a sweet ride!

911GT2
Wispy white smoke = coolant burning off

Thick white smoke = transmission/differential oil

TURBOZ
Ahhhh...well, this is whispy. Check this out. When the car overheats, you smell this nasty smell like someone farted. Guess what it is! Stop Leak! Someone put it in there, and guess what it decided to do.......gum up my damn water pump. I'm going to take the housing off tonight and see if the water pump will spin. If it doesn't, theres my problem. Big one too, the part lists for 237.

911GT2
Coolant's burning. That=bad.

TURBOZ
I took the water pump off tonight. (boy was that a chore) The pumps not so bad, it's getting all the stuff out of the way that is. Anyway, I think that was my problem. All the time, I kept hearing this whining from the engine bay, faint, but there, didn't know what it was....well, the water pump is turned by a spindle that goes into the back of it. The female end (the water pump) had some stripped teeth, which were probably making the grinding. The steath did it when the output shaft stripped. So, looks like its a new water pump to the rescue. Now to just find a good inexpensive one........