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GtoRA2 08-09-2002 09:30 AM

How hot?
I just got a new 68GTO, and it has an older radiater, how hot is too hot, its a 400cube with a 400 turbo tranny.

It hit 210 yesterday in very hot weather, what is the high end of safe for the temp?


78 monte 08-09-2002 10:00 AM

210 is where I shut down the motor.Check it for a couple days to see if it still does it.It could of just been the weather.See if you've got flow in the rad. 08-09-2002 11:23 AM

I run my car @ 210 all day long in good old B'field 100F weather. It won't hurt the engine to run that hot but your cooling system needs to be in good shape to handle it (good hoses, 50/50 coolant, 13# radiator cap).

mr_chickenhead 08-09-2002 10:25 PM

I go with too hot at 210. I have a autometer warining lite set to go off at 210 nd will shut it down immidiatly. check your timing before you go through your cooling system.

78 monte 08-10-2002 10:47 PM

Also if you have an automatic tranny w/ the cooler in the rad you definitly don't ant to be running hot.Auto trannys take a dislike to heat.

dinger 08-10-2002 11:32 PM

I'll have to agree with 36willys, 210 with a crossflow and a good system is not too hot, the coolant won't boil at these temps with a sealed system. I live about 80 miles north of 36, 102 today, 210 all day long.

4 Jaw Chuck 08-11-2002 12:15 AM

210 is safe and the trans will run much hotter than that. If it bothers you get an aftermarket trans cooler and plumb it inline in front of the rad, this will reduce the heat load on the coolant system somewhat.

Steve karch 08-11-2002 05:23 AM

I use 2 cans of Water Wetter, water and aprox 1 lt of anfifreeze (to help inhibit corrosion) and a 160 t-stat. It rareley sees the high side of 200 on a hot day (95 deg or hotter). Usually runs 180-190 in hot ambient temps, and 180 when is cooler than 80 degs out. Water will disperse heat better than antifreeze. Water Wetter helps and inhibits rust and lubes the waterpump.
Hope this helps 08-11-2002 07:07 AM

Watch out Steve, I tried some liters in my car once and almost blew it up! I stick with gallons now for safety's sake.

Steve karch 08-11-2002 09:50 AM

What's a gallon again? Aren't they kinda expensive.

drewhelm 08-13-2002 08:08 AM

Is everyone talking about PONTIACs? Pontiacs generally run hotter than Chevy Motors and 210 is fine. I would recommend a separate trans cooler, though. Add some water wetter and an aftermarket trans cooler. Temp should be right around 205-210 all day long. No problems.

Mertz 08-13-2002 08:44 AM

My 428 is running at around 210 and have not had any problems. It does get hotter than that when I slow to "parade" speed. I changed the water pump and put on a 16# cap and a 180 high performance t-stat. It runs a little cooler but not much. If it gets to hot it is very difficult to restart.

The most important thing I did was to move the temp sending unit from the head to the intake manifold. Before that I was getting really high temp readings and the water did not measure that hot on my termometer.

Trans work better with hot fluid so don't cool it off to much with a trans cooler.

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