over heating??
Thread Starter
Heel & Toe
Joined: Jun 2003
Posts: 19
Likes: 0
From: san diego ca
over heating??
hey guys, I just got my C4 and if you ask me its running hot. The needle on the temp gage is usually slightly more than half way, however at times it increases substantially to almost 260. However i have noticed that the needle on the oil psi gague fluxuates quite a bit so i dont know if its a problem with the needles or if it actually is running hot. when i turn on the heater the air isn't super hot unless i pump up the temperature to 90. What do you guys think?
thanks for the help.
thanks for the help.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Re: over heating?? (venom858)
ACK!
260???
something is VERY wrong. The fans should kick by 235...
make sure there is no debris in the air intake under the bumper. That is a big cause of overheating.
There could be a number of problems... a bad temp sensor...
what year?
260???
something is VERY wrong. The fans should kick by 235...
make sure there is no debris in the air intake under the bumper. That is a big cause of overheating.
There could be a number of problems... a bad temp sensor...
what year?
Instructor
Joined: Jan 2003
Posts: 196
Likes: 0
From: harvest al
Re: over heating?? (bogus)
You really need to remove the aircleaner and radiator shroud to make sure the radiator is not blocked. As Andy says, the design allows for almost anything to get sucked up there. If your car has a lot of miles, you can bet it's dirty. Check your antifreeze level too (I know, sounds pretty basic). There are three steps for keeping these things cool: Clean radiator, 160 thermostat, and fans. I've done the first two and I rarely hit 200 - in Alabama. Good luck.
Burning Brakes
Joined: Jul 2002
Posts: 871
Likes: 0
From: Costa Mesa CA
Re: over heating?? (venom858)
Sounds like you have an air bubble in the system. C4's are bad about that anytime the cooling system is gotten into.
To be sure, take out the thermo and top off the radiator. If you problem is solved, that's the prob. Leave the thermo out or drill a small hole in the non-moving part of the thermo and reinstall.
Yeah, hate those needles. Give me the digits any day.
BIG JIM
To be sure, take out the thermo and top off the radiator. If you problem is solved, that's the prob. Leave the thermo out or drill a small hole in the non-moving part of the thermo and reinstall.
Yeah, hate those needles. Give me the digits any day.
BIG JIM
Race Director
Joined: May 2000
Posts: 17,101
Likes: 4
From: No more yankee my wankee, the Donger is tired!
Re: over heating?? (venom858)
First of all the analog gauge is not linear. Enter into diagnostic mode on the AC..... hold the up and down fan buttons at the same time till 00 shows up, scroll to 16 using either fan speed button, then hit the auto fan speed button. That will bring up the temp in Centigrade..... 110+ is close to 230 F
With that said, check to make sure both fans are operational, if the secondary fan is not comming on, that could be the cause of the excess heat. Then go ahead and clean the radiator of debris. Take it to a car wash place and use a high pressure spray to help get the grime out.
Or just forget about it and get a Ron Davis radiator and never worry about temps again.
[Modified by Jeffvette, 1:42 PM 7/30/2003]
With that said, check to make sure both fans are operational, if the secondary fan is not comming on, that could be the cause of the excess heat. Then go ahead and clean the radiator of debris. Take it to a car wash place and use a high pressure spray to help get the grime out.
Or just forget about it and get a Ron Davis radiator and never worry about temps again.
[Modified by Jeffvette, 1:42 PM 7/30/2003]
Instructor
Joined: Apr 2003
Posts: 224
Likes: 0
From: Gilbert Arizona
Re: over heating?? (Dilligas)
What temp is the digital readout showing, I know that my 94 is not very accurate with the analog gauge.
Some C4's don't have a digital temp reading :( I know this is the case with model yr 91. I can't imagine not having that kind of accuracy, personally.
[Modified by SkunkCar, 2:51 PM 7/30/2003]
[Modified by SkunkCar, 2:51 PM 7/30/2003]
Race Director
Joined: May 2000
Posts: 17,101
Likes: 4
From: No more yankee my wankee, the Donger is tired!
Re: over heating?? (SkunkCar)
Some C4's don't have a digital temp reading :( I know this is the case with model yr 91. I can't imagine not having that kind of accuracy, personally.
They all do.......
Enter into diagnostic mode on the AC..... hold the up and down fan buttons at the same time till 00 shows up, scroll to 16 using either fan speed button, then hit the auto fan speed button. That will bring up the temp in Centigrade..... 110+ is close to 230 F
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Instructor
Joined: Apr 2003
Posts: 224
Likes: 0
From: Gilbert Arizona
Re: over heating?? (Jeffvette)
Some C4's don't have a digital temp reading :( I know this is the case with model yr 91. I can't imagine not having that kind of accuracy, personally.
They all do.......
Enter into diagnostic mode on the AC..... hold the up and down fan buttons at the same time till 00 shows up, scroll to 16 using either fan speed button, then hit the auto fan speed button. That will bring up the temp in Centigrade..... 110+ is close to 230 F
They all do.......
Enter into diagnostic mode on the AC..... hold the up and down fan buttons at the same time till 00 shows up, scroll to 16 using either fan speed button, then hit the auto fan speed button. That will bring up the temp in Centigrade..... 110+ is close to 230 F
[Modified by SkunkCar, 3:27 PM 7/30/2003]
Race Director
Joined: May 2000
Posts: 17,101
Likes: 4
From: No more yankee my wankee, the Donger is tired!
Re: over heating?? (SkunkCar)
That sounds rather inconvenient to go into diagnostic mode while you're cruising at 75mph on the freeway ... too bad they can't show that info along with the speedo/fuel level/etc. on the '91 cars.
How is it inconvenient? Especially if you've never done it?
Instructor
Joined: Apr 2003
Posts: 224
Likes: 0
From: Gilbert Arizona
Re: over heating?? (Jeffvette)
How is it inconvenient? Especially if you've never done it?
Am I missing something here? :confused:
Thread Starter
Heel & Toe
Joined: Jun 2003
Posts: 19
Likes: 0
From: san diego ca
Re: over heating?? (sundbergjc)
You really need to remove the aircleaner and radiator shroud to make sure the radiator is not blocked. --sundbergjc
Unfortunately im a pretty big moron at this stuff, is this easy to do? can someone tell me what that would entail doing?
thanks again
[Modified by venom858, 11:59 PM 7/30/2003]
Unfortunately im a pretty big moron at this stuff, is this easy to do? can someone tell me what that would entail doing?
thanks again
[Modified by venom858, 11:59 PM 7/30/2003]
Instructor
Joined: Apr 2003
Posts: 224
Likes: 0
From: Gilbert Arizona
Re: over heating?? (venom858)
This tech tip will get you on your way...
https://www.corvetteforum.com/techti...D=53&TopicID=2
https://www.corvetteforum.com/techti...D=53&TopicID=2
Thread Starter
Heel & Toe
Joined: Jun 2003
Posts: 19
Likes: 0
From: san diego ca
Re: over heating?? (SkunkCar)
also, i just went outside and turned on my vette, left it in park and popped the hood to check the fans. NEITHER were on, could this be the problem? or do they not come on until a certain temperature is reached?
Oh, and i have a 95 if that helps any.
Once again, thanks for the help guys.
[Modified by venom858, 12:09 AM 7/31/2003]
Oh, and i have a 95 if that helps any.
Once again, thanks for the help guys.
[Modified by venom858, 12:09 AM 7/31/2003]
Pro
Joined: May 2002
Posts: 510
Likes: 0
From: Hockessin DE
Re: over heating?? (venom858)
also, i just went outside and turned on my vette, left it in park and popped the hood to check the fans. NEITHER were on, could this be the problem? or do they not come on until a certain temperature is reached?
BTW- your fans do turn on at a certain temp. You have to wait until the car heats up.
[Modified by Red91Vette, 12:18 AM 7/31/2003]
Race Director
Joined: May 2000
Posts: 17,101
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From: No more yankee my wankee, the Donger is tired!
Re: over heating?? (SkunkCar)
How is it inconvenient? Especially if you've never done it?
Well, glancing at the dashboard at eye level to see engine temp vs. pushing a series of buttons down behind the shifter to reveal engine temp. I reiterate my point: It's inconvenient at highway speeds :yesnod:
Am I missing something here? :confused:
Well, glancing at the dashboard at eye level to see engine temp vs. pushing a series of buttons down behind the shifter to reveal engine temp. I reiterate my point: It's inconvenient at highway speeds :yesnod:
Am I missing something here? :confused:
Amazing, I had time to do it at the track this weekend while running...... I guess you don't know your car well enough to do certain functions without looking, and it's not behind the shifter, that's where the radio is.
