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 Engine overheating 
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Joined: Mon Apr 21, 2014 1:17 pm
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Location: Scarborough
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Post Engine overheating
Hello folks. My car started to overheat today in traffic. Luckily I made it home. 1996 stock LT1.

1) Rad is clear of debri
2) Rad is full of anti-freeze
3) Both cooling fans are working perfect
4) Can't hear any vacuum leaks (idle is normal)
5) No anti-freeze leaks from the water pump or engine

I let it cool off for a few hours. Took it for another short test run and the temp just keeps climbing once she starts. Overheats straight to the top of the gauge within 10 minutes. Driving 100 kph on the highway and she still won't cool down.

I'm thinking that it's a stuck thermostat?

Suggestions please?

Thanks in advance,
Ken

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1996 Z-28/SS

Previously - 1996 Z-28, 1989 Pontiac GTA, 1985 5.7 IROC Z-28, 1976 Camaro LT, 1974 Trans Am 455HO, 1974 Z-28, 1967 Firebird Sprint,
1967 Camaro 230 cu-in 140-hp "Blue Flame" straight six with a 2-speed powerglide.


Fri Apr 17, 2015 9:54 pm
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Joined: Sun May 13, 2007 10:48 am
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Post Re: Engine overheating
Ya i'd start with a new thermostat. Might as well flush it out and replace with fresh coolant. If you've never done this you might want to inspect the opti spark for corrosion at the terminals and especially under the cap. Spray liberally with WD40, often, all over the thing inside out etc. Dielectric grease on the terminals. Those optis can be a pita if they start corroding

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1987 IROC ww 99 LS1,TR224/112, STG2 heads ported by American Speed, P Gold springs, LS6 intake, SVO 30's, Ported TB, Comp Cromo Push rods, Katech Rod bolts, LS6 oil pump, T56, SW LT's, 8.8 hybrid rear 3.73, 275/40/17 MT ET streets, lots more
12.1 @ 112 mph 1.69 60'

89 R7U 1LE Players Challenge car all stock.


Sat Apr 18, 2015 1:49 am
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Post Re: Engine overheating
Yeah I would be looking for a stuck thermostat. At least they are easy to do on the LT1!

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Sat Apr 18, 2015 8:11 am
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Post Re: Engine overheating
Thank you very kindly for your input gentlemen.

I'm on it today.

Ken

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1996 Z-28/SS

Previously - 1996 Z-28, 1989 Pontiac GTA, 1985 5.7 IROC Z-28, 1976 Camaro LT, 1974 Trans Am 455HO, 1974 Z-28, 1967 Firebird Sprint,
1967 Camaro 230 cu-in 140-hp "Blue Flame" straight six with a 2-speed powerglide.


Sat Apr 18, 2015 10:44 am
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Joined: Mon Apr 21, 2014 1:17 pm
Posts: 143
Location: Scarborough
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Post Re: Engine overheating
The Red Acorn is back to normal and runs as cool as a fudgesicle. Skrat is happy again... As my wife would say.

The strange thing is the car overheated coming back from checking out the Montreal Deli for the first time. Things that make you go "hmm".

Cheers,
Ken

_________________
1996 Z-28/SS

Previously - 1996 Z-28, 1989 Pontiac GTA, 1985 5.7 IROC Z-28, 1976 Camaro LT, 1974 Trans Am 455HO, 1974 Z-28, 1967 Firebird Sprint,
1967 Camaro 230 cu-in 140-hp "Blue Flame" straight six with a 2-speed powerglide.


Sat Apr 18, 2015 2:58 pm
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Location: Brampton
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Post Re: Engine overheating
A rad cap not holding pressure can also cause this since you checked all the usual culprits.

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Fri Apr 24, 2015 12:51 pm
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Joined: Wed Jul 09, 2008 9:16 pm
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Post Re: Engine overheating
Did it end up being the thermostat? Just curious...I have a friend with an LT1 who's been experiencing the same stuff.


Thu Apr 30, 2015 9:49 am
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Post Re: Engine overheating
Yes it was 100% the thermostat. It runs perfect again... Well, let's just say it runs as perfect as it did before the overheating.

_________________
1996 Z-28/SS

Previously - 1996 Z-28, 1989 Pontiac GTA, 1985 5.7 IROC Z-28, 1976 Camaro LT, 1974 Trans Am 455HO, 1974 Z-28, 1967 Firebird Sprint,
1967 Camaro 230 cu-in 140-hp "Blue Flame" straight six with a 2-speed powerglide.


Thu Apr 30, 2015 6:30 pm
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