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 Engine Temperature randomly goes from 200 to 215

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walkin
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PostSubject: Engine Temperature randomly goes from 200 to 215   Tue Mar 24, 2009 1:33 pm

I've got a 98 supercharged riviera. when i'm doing highway driving, my temp gauge is usualy at 200. most of the time i get stuck in rush hour traffic and my gauge will go from 200 to 215 back down to 200. randomly i get a very small amount of steam release when it hits 215. The coolent level is fine and i've looked over the radiator and hoses and i cant find any leaks. Any thoughts why it might be doing this?
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curious riv
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Tue Mar 24, 2009 2:06 pm

How long has it been since you changed out your thermostat?
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walkin
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Tue Mar 24, 2009 2:14 pm

I'm not sure if it has been changed. i bought the car with 90k miles on it and it now has 110k.
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curious riv
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Tue Mar 24, 2009 2:48 pm

You should change it out with a 180 t-stat first, then go from there.
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Tue Mar 24, 2009 2:50 pm

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AA
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Tue Mar 24, 2009 3:44 pm

When you say "randomly", what do you mean by that? With a stock t-stat, the behavior you're describing is somewhat expected at idle, because there's no air flow to cool the engine. Fans don't kick on until ~220F.

As suggested by Chris, a 180F t-stat will give lower temps while driving, but even with the lower temp unit, temps will still go up when stopped idle in traffic on hot days.

The steam indicates a small leak somewhere. Check over your hoses and radiator when running hot.

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'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
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walkin
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Tue Mar 24, 2009 4:21 pm

i guess when i say randomly i've had it to where its sitting idle after a long drive and it doesn't heat up over 200, where other days it will.
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Tue Mar 24, 2009 4:31 pm

Does it depend on the temperature outside? We've been having a lot of warm days lately. How fresh is the coolant in the system? Is it full?

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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curious riv
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Wed Mar 25, 2009 8:40 am

Also replace the radiator cap. That would explain the steam when it does get hot. (It builds up so much pressure then releases through the cap)
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Wed Mar 25, 2009 9:03 am

Do you ever have to add coolant?

215 is not alarming at all. Stock these are designed to run around 200 and the fans don't come on until much hotter.

If you leave your A/C on, the fans should stay on as well, does this prevent the 215 spikes?

I'd say it's normal. When you pull off the freeway, all that heat has to go somewhere else, and you just stopped blowing cool air over the whole system, so the coolant heats up, then the fans kick on and the coolant comes back down... totally normal.

As for the steam... you'll have to see where it's coming from. Could be anything.
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curious riv
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Wed Mar 25, 2009 12:54 pm

curious riv wrote:
Also replace the radiator cap. That would explain the steam when it does get hot. (It builds up so much pressure then releases through the cap)
I meant could bonk
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Wed Mar 25, 2009 1:30 pm

i haven't had to fill it up in a while. I toped it off with some of the universal fluid before i took a trip. i drove 900 miles in one day, twice in one week and it started happening after that. I'll heat it up and see if i can find any leaks. I think i'll go with the 180 t-stat and change the fuild and see if that helps.

Thanks for all the suggestions.
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Wed Mar 25, 2009 1:53 pm

Just remember if you do put in a 180 stat - the cruising temp will be 180, but your in-traffic/idle temp will still climb to 215 because that's where the fans are set to turn on. Unless you find someone with a programmer who can alter your fan settings.

Personally I don't have a problem with engine temps at 200-210, it's where the engine was designed to operate, you will get the most economy and least wear on a stock engine. If you are working on performance and struggling to reduce engine knock then you may want the 180..
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walkin
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Wed Mar 25, 2009 2:25 pm

i guess i'm just more worried about the steam release. when it goes from 200 to 215 it almost seams like the motor is strugglying or running ruff... i guess i'm just so used to driving cars with non electric fans and they dont heat up over 200.
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deekster_caddy
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Wed Mar 25, 2009 4:13 pm

walkin wrote:
i guess i'm just more worried about the steam release. when it goes from 200 to 215 it almost seams like the motor is strugglying or running ruff... i guess i'm just so used to driving cars with non electric fans and they dont heat up over 200.

Then something else is up. You could have dirty injectors, bad wires, who knows...?? Running at 215 will not cause it to run rough. If anything, it will run smoother...
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Wed Mar 25, 2009 4:21 pm

Regarding the 180 t-stat, this is a mod used in SC engines to help reduce knock. There is not benefit other than that. While you can install one on a NA engine and make the coolant temp drop, I don't think it will give anything performance-wise. Like Derek said, your engine is happiest right around 200F.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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EatDirtFartDust
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Fri Mar 27, 2009 1:05 am

hmm, my thermostat stays right at 160, and the heater doesn't work too good. Maybe time for a thermostat.
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deekster_caddy
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PostSubject: Re: Engine Temperature randomly goes from 200 to 215   Fri Mar 27, 2009 7:42 am

EatDirtFartDust wrote:
hmm, my thermostat stays right at 160, and the heater doesn't work too good. Maybe time for a thermostat.

Yep!
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