still too dang hot
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Instructor
Joined: Dec 2011
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still too dang hot
Yesterday doing 80 on the highway, A/C on, with outside temp at 90. Digital water temp 212 and oil temp 243! I have flushed the radiator...50/50 distilled water and dexcool..blown out the fins on the radiator too. Oil still is running 20 to 30 degrees over water temp. even around town on the streets. What else can I do? I am going to go to the big corvette Spearfish event in a couple of weeks and weather could be close to 100. It is apox an 1800 mile round trip deal. In the hills of South Dakota who knows what oil temps are going to be at this point.
I am running mobil 1 and basically stock except for a varam air bridge, z06 cover on the air cleaner box, k&n filter and titanium exhaust. Recent tune up.I also put a trans cooler on it to lower the temp in the trans and by passed the stock one, so no heat is being generated by the stock cooler in the radiator either. I am going to dump some water wetter in it today....what else do you think I should do? frustrating!!!!
I really don't want to add another cooler for oil in front of the radiator if I dont have to.
I am running mobil 1 and basically stock except for a varam air bridge, z06 cover on the air cleaner box, k&n filter and titanium exhaust. Recent tune up.I also put a trans cooler on it to lower the temp in the trans and by passed the stock one, so no heat is being generated by the stock cooler in the radiator either. I am going to dump some water wetter in it today....what else do you think I should do? frustrating!!!!
I really don't want to add another cooler for oil in front of the radiator if I dont have to.
Melting Slicks
Joined: Mar 2002
Posts: 2,203
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From: Staten Island NY
Those are not out of range high temps ......
I would just make sure the AC condenser is also clean and unobstructed, check that the fans are running when the AC is switched on (more of a concern on low speeds) coolant and oil are up to proper levels.
I would just make sure the AC condenser is also clean and unobstructed, check that the fans are running when the AC is switched on (more of a concern on low speeds) coolant and oil are up to proper levels.
Le Mans Master
Joined: Mar 2004
Posts: 8,700
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From: Ft. Lauderdale Fl
Living in South Florida, during the summer, (now) I run at highway speed....194-196 water temps and in traffic, it gets up to 210 at times.
I realize that is on the cool side but not worried. The oil still gets over 215 which is important to boil off any condensation.
You might want to pull the radiator and do a low pressure cleaning on the radiator and the A/C.
I realize that is on the cool side but not worried. The oil still gets over 215 which is important to boil off any condensation.
You might want to pull the radiator and do a low pressure cleaning on the radiator and the A/C.
Last edited by runner140*; Jun 27, 2012 at 11:25 AM. Reason: add
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Those temps are fine, but if you wanted to run a little cooler you could put a 180* thermostat in. Stock is 187*. Your cruising temps will be a little cooler but your in traffic temp won't change unless you have the fan on/off temps changed by a tuner or you could use one of our CoolIts to turn your fan on when ever you want to, like when your in traffic. It will also help keep you automatic transmission fluid running cooler.
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Race Director
Joined: Apr 2007
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From: South Western Ontario
I don't see much over about 195* on the highway. It only varies a bit with the abient air temps.
Did you clean both the radiator and the condensor fins? You almost must have a 90 degree air wand to reach between them and blow them out.
Did you burp the cooling system properly after re-filling? Sometimes, the easiest way is to loosen the front crossover tube between heads and let the air out there.
Did you clean both the radiator and the condensor fins? You almost must have a 90 degree air wand to reach between them and blow them out.
Did you burp the cooling system properly after re-filling? Sometimes, the easiest way is to loosen the front crossover tube between heads and let the air out there.
Drifting
Joined: Jan 2010
Posts: 1,447
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From: Katy TX
108* yesterday, with the A/C OFF I was seeing 225-230* water temps in stop & go traffic and 212* on the highway.
I removed my radiator shroud this morning. So I'm going to see if my stop & go temps are reduced.
I removed my radiator shroud this morning. So I'm going to see if my stop & go temps are reduced.
Drifting
Joined: Sep 2009
Posts: 1,862
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From: Prescott, Arizona
Mine runs around 200 degrees most times.
When pulling off the track or for the last slow mile home (A/C off) in hot weather it would go to 220 where the first fan comes up, sometimes 230 in hot weather off the track
I added a Sac City Cool It so I can manually call up high right fan off the track or for that last mile. Keeps it at 200.
When pulling off the track or for the last slow mile home (A/C off) in hot weather it would go to 220 where the first fan comes up, sometimes 230 in hot weather off the track
I added a Sac City Cool It so I can manually call up high right fan off the track or for that last mile. Keeps it at 200.
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Tech Contributor
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From: Oak Hill Virginia
You and the OP should clean the debris out of your radiator and A/C condenser and add some watter wetter to your coolant if you want to lower your temps a little. That said, neither of you are reporting temps that are out of acceptable range. Especially if it's 108 degrees outside.
Last edited by cdkcorvette7; Jun 27, 2012 at 01:56 PM.
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After reading it you'll see your temps are normal for a stock C5.
C5 Cooling Fans Operation
"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). "
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From: South Western Ontario
Instructor
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my system has a 50/50 mix with new water pump, new coolant reservoir & new 15 psi cap, running with the CoolIt, system blurped properly, released air at air bridge also,, - got once to a big hill, alot of corners, 90 degree outside.. 1st gear and 2th all the the time, once got on top display was reading 238, stoped by side and it needed 1 minute to start droping.. if i'd shut off car i'm pretty sure it would explode something underhood and let the water out.
i need a fire extinguisher
Race Director
Joined: Apr 2007
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From: South Western Ontario
Pulling the rad shroud in an attempt to lower the coolant temps isn't going to do anything useful though.
Last edited by lionelhutz; Jun 27, 2012 at 05:51 PM.
Racer
Joined: Mar 2009
Posts: 394
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From: Everywhere US
We have this issue all the time here in Arizona ..... I put together a cleaning tube to clear debris from both the radiator and the condense with only removing the upper bridge making the space between the rad and condenser accessable .... 20 miniutes of cleaning a couple of times a year keeps our C5s running cooler all year round .....
These are available ... so just drop me a PM and I'll shoot one off to ya ......
after cleaning this weekend .....
These are available ... so just drop me a PM and I'll shoot one off to ya ......
after cleaning this weekend .....
Le Mans Master
Joined: Jun 2008
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From: Rockledge FL
Ive always been curious about this. Expert tuners in the C3 forum swear that around 72 GM started making their cars to run hotter for emissions reasons. That is why on the old SBCs and BBCs the first power increase is to advance the timing so it lowers the cylinder temps.
Instructor
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Ive always been curious about this. Expert tuners in the C3 forum swear that around 72 GM started making their cars to run hotter for emissions reasons. That is why on the old SBCs and BBCs the first power increase is to advance the timing so it lowers the cylinder temps.
For you guys who cleaned the radiator: is there any possibility to clean it with removing the shroud and radiator still let in the car? I really would not like to remove whole radiator
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