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Username Post: Coolant Temp        (Topic#221295)
Chevyguy04 
Member
Posts: 213

Reg: 05-23-05
07-12-09 08:20 AM - Post#1733397    

Ok I have an 03 and Noticed lately the temp fluctuates from 190 to 220F, min I get into city driving the temp goes up sometimes getting to 220F. I dont remember it doing it this bad before, there were times in the past of driving hard in real hot and humid temps it would get up to 220F but not normal city driving. The fans are running but they dont seem to kick in high until I turn the a/c on.

Have any of you guys seen this on your cars? What do you think the issue is?



Scott
2012 Chevy Tahoe
2007 Yukon Denali
2003 Corvette 50th
2002 Chevy 2500HD
1969 Impala 396
1955 Chevy Pickup 427 450HP
1969 Camaro z28




 




wagonmaster 
Senior Member
Posts: 8917
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
07-12-09 02:43 PM - Post#1733655    
    In response to Chevyguy04

With the 197* thermostat you're correct on the temps, but it's pretty much normal for this time of the year. The fans won't come on until 205-210 unless the A/C is on, and then they're on all the time. Check to make certain they are both working!

Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 
Chevyguy04 
Member
Posts: 213

Reg: 05-23-05
07-14-09 06:06 PM - Post#1735148    
    In response to wagonmaster

yea both fans are working, but they never seem to kick it up to high until I turn the A/C on. I just dont remember it getting so hot in normal driving. I know it has got hot when I would run it hard and not get much airflow (ie highway).

Thank you

Scott
2012 Chevy Tahoe
2007 Yukon Denali
2003 Corvette 50th
2002 Chevy 2500HD
1969 Impala 396
1955 Chevy Pickup 427 450HP
1969 Camaro z28




 
Sting Ray 
"14th Year" Silver Supporting Member
Posts: 2900
Sting Ray
Loc: Drag City, California
Reg: 02-19-05
07-14-09 06:37 PM - Post#1735171    
    In response to Chevyguy04

That's regular stuff. They are designed to run hot for emission purposes. Now if your Z28 was running those temps, you gotta a problem.

Bleeds Chevy Orange

1957 Chevy 150, 3-spd
1964 Corvette two top convert, 4-spd
1965 Pontiac GTO hrdtp, tri-power, 4-spd, 4.11's
1967 El Camino, 427, 4-spd
2009 Corvette coupe, triple black, 436 hp, 6-spd


 
hotwheels57 
Senior Member
Posts: 8602
hotwheels57
Reg: 11-20-02
07-15-09 09:59 AM - Post#1735453    
    In response to Sting Ray

It's not uncommon for a C5 "bottom breather" to run 190 to 220 degrees in summer city driving. As long as the temperatures drop with highway driving, it's probably not indicative of any problem.

Still, if you've never done any preventative maintenance, it wouldn't hurt to check operation or change out the thermostat, change the coolant, replace the coolant recovery cap, check for collapsing radiator hoses, etc.

Another common issue with the C5 is road debris gets stuck between the condenser and radiator. You can get under the front end and check for plastic bags, leaves, paper, etc. Blow it out carefully with compressed air or water or a soft brush. Do that routinely unless you have a screen to keep the debris from clogging up the cooling.

Some C5 owners like to really lower their cars. In doing so, they hate the scraping noise of the front air dam assembly and some remove the air dams. They were designed to direct air from beneath the car up and into the radiator. Make certain the front air dam is there. That could cause temperature changes.

It's important to remember that if your car is stock and the fans have not been reprogrammed that the factory setting will not let the first cooling fan come on until the coolant reaches 226 degrees.

Quote:

"The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph)."

Using keywords "radiator fans temperature" on corvetteforum in C5 Tech, I found lots to read...

http://forums.corvetteforum.com/search.php?searchi...

Karma is the universal equalizer. The Ignore User feature comes in a close second.


Edited by hotwheels57 on 07-15-09 10:08 AM. Reason for edit: No reason given.

 
1965C-10 
Very Senior Member
Posts: 7284
1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
Reg: 11-18-01
07-16-09 09:39 PM - Post#1736369    
    In response to Chevyguy04

Mine gets up to 220 slowly, then it will go back down.

I don't remember it doing this before in the past summers.

It's due for a coolant flush/change, probably a new thermostat, and a new surge tank, looks like it's leaking a little bit, from the crust on the seams.





 
wagonmaster 
Senior Member
Posts: 8917
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
07-17-09 06:18 AM - Post#1736486    
    In response to 1965C-10

Try one of the after market 180* thermostats. Sure made a difference in my C5. Not only the obvious (cooler) but more power as well!

Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 
hotwheels57 
Senior Member
Posts: 8602
hotwheels57
Reg: 11-20-02
07-17-09 07:04 AM - Post#1736532    
    In response to wagonmaster

With a thermostat change, the full benefit won't be seen w/o a change of the on/off settings of the fans though.

A lower thermostat (180 vs 195) will just open sooner, then the temperature variations will still be dependent on the same factors as the original thermostat. The fan settings can easily be done by a "pro" tuner or some hand held DIY tuners. Just re-setting the on/off temperatures will provide some relief.


The LS based motors were engineered around the higher temperatures. We're not driving carburetor cars anymore.

I set the DIC on mine to show the oil temperatures rather than the coolant temperatures.

Karma is the universal equalizer. The Ignore User feature comes in a close second.


Edited by hotwheels57 on 07-17-09 07:14 AM. Reason for edit: No reason given.

 
wagonmaster 
Senior Member
Posts: 8917
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
07-17-09 01:33 PM - Post#1736754    
    In response to hotwheels57

  • Quote:
With a thermostat change, the full benefit won't be seen w/o a change of the on/off settings of the fans though.



True, but many of the aftermarket t'stats come with the wiring mods enclosed to handle the fans. True, they're not carbureted any longer, but they still like temps a bit cooler than the "general" designed into them to meet emissions. Nearly ever LS motored racer will agree with me here....It works and it's inexpensively done.

Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 
hotwheels57 
Senior Member
Posts: 8602
hotwheels57
Reg: 11-20-02
07-17-09 02:22 PM - Post#1736791    
    In response to wagonmaster

We're saying the same thing...the lower temperature thermostat and completing the fan(s) modification (wiring or on/off changes) will achieve lower temperature results (for that modification).

The best way to achieve maximum lower temperatures is with a larger heat exchanger allowing for maximum air flow and coolant (water and oil). Not many street cars really justify that expense though.

I'm in complete agreement with a dedicated "racer". But on a street car the benefits may not be as great, except in ones mind.

NASCAR motors run pretty hot and still develop maximum horsepower/torque.

Let's just agree to disagree...

Karma is the universal equalizer. The Ignore User feature comes in a close second.


Edited by hotwheels57 on 07-17-09 02:38 PM. Reason for edit: No reason given.

 
wagonmaster 
Senior Member
Posts: 8917
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
07-18-09 03:39 AM - Post#1737100    
    In response to hotwheels57

Will do. I work with a guy whose opinion mirrors yours. We always have these "spirited" discussions on this stuff, but always part friends.

Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 
1965C-10 
Very Senior Member
Posts: 7284
1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
Reg: 11-18-01
02-26-10 01:45 PM - Post#1869982    
    In response to wagonmaster

In November, I did my first coolant flush/exchange.

What I did was buy 6 gallons of distilled water (Arizona tap water is pretty hard) drained what would come out, fill it up with distilled water.

Then go drive until it reached the hottest temp, and then back down, to make sure the t-stat opened, turn the heat on full hot, and drove some more.

Then come home, let it cool down and drain.

I did this over and over 3 times with just putting in and draining distilled water(each time letting it get fully hot and going through the heater core by driving around running errands)

It still was not perfectly clear water(the coolant still looked red, not brown or rusty as I've read it can get if neglected to long) but it was close enough.

Filled it with Prestone Dex Cool GM approved, I put in 2 gallons of that, and I forget how many gallons of new distilled water.

Ran it with the heater on to mix well, next day checked with the "tool" that has the floating needle and it checked good.

I have found it does not run any cooler than before, and I did'nt expect it to, just did it for maintenance.

After paying more attention, the temp does go to 225 maybe 226 before it starts cools down.

It may take a 1/2 hour to do this driving around because the wind keeps it from getting that hot.

Went through a In and Out Burger drive through, and found sitting with the engine idling it slowly creeped up to 225 or 226, then started backing down.

In summer here in Phoenix, it will go to 225 or 226 much quicker.





 
1965C-10 
Very Senior Member
Posts: 7284
1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
Reg: 11-18-01
02-26-10 01:53 PM - Post#1869989    
    In response to 1965C-10

Also, the drain petcock is pretty cool on these cars, I had read that they snap easy, and sometimes there is a blockage behind them of antifreeze goop.

I drained the car several times, and never found and problems(I was being careful with it)

When draining the distilled water/old coolant out, after the first time, I got bored/impatient with waiting for it to cool all the way down and did it while it was still fairly hot.

It's a pretty good setup, I expected coolant to be splashing everywhere like on other cars I've done, but on the Corvette, it drains perfectly down.

I could not see exactly, but it looks like there is a little pan with a snout under the drain hole that "funnels" the coolant smoothly strait down






 
Cirrus8 
Forum Newbie
Posts: 14
Cirrus8
Age: 87
Loc: Sandy, Utah
Reg: 06-21-10
06-22-10 11:43 AM - Post#1934200    
    In response to Chevyguy04

I have a 2001 coupe. Two years ago, I changed the coolant and replaced it with Prestone Dex Cool. Before I changed it, the engine temp while driving around suburbia was 192*. Since changing, the temp is now running around 198* Nothing has changed but the coolant. Could it be that the Prestone does not have the heat removing characteristics as the original coolant. Enquiring minds want to know!!



 
wagonmaster 
Senior Member
Posts: 8917
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
06-23-10 08:32 AM - Post#1934673    
    In response to Cirrus8

I can't imagine the antifreeze change alone is responsible for the change. I'd look for something else.... restricted airflow, fans slowed down....Doesn't make sense to me.

Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 
1965C-10 
Very Senior Member
Posts: 7284
1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
Reg: 11-18-01
06-24-10 06:29 PM - Post#1935519    
    In response to Cirrus8

Maybe there is a air pocket in there.



 
o2bnkc 
Forum Newbie
Posts: 16

Loc: Carson City, Nv.
Reg: 03-29-13
03-29-13 11:39 PM - Post#2330925    
    In response to 1965C-10

It's normal.

A Proud Navy Vet


 




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