Topic: 1982 Corvette over heating problem
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#1 Mar 9, 2008 at 7:31 pmI can't figure this out myself, maybe one of you guys have an idea what I can try next. I had the Vette a year before I started fooling around with the engine, 350 cross-fire injection, so I know it ran fine up to that time. the first thing I did was to remove the cataletic converter and put duel exhaust on, it sure ran a ton better, but I noticed that it ran 5 to 10 degrees hotter but it was no big deal, the hottest it got was 210. Then I added a
Corvette Underdrive Aluminum Pulley System, with chrome water water pump and new aluminum fan blade. Thats when the trouble began. It would not over heat in traffic but when I was climbing a long hill, it would go up to 260 and I would pull off and let it cool down, this Vette also has a automatic electric fan on the radiator that kick on a 240, I modified it so it would run all the time to see if that would help keep it from the boiling point, but it didn't, and I know the guage is working because it did boil over at 264, next eckleres said to buy a Hi flow water pump for it, so I did, no change, next was the radiator, it was 30% stopped up, so I had it replaced the 2 stage with a new 3 stage radiator, no change, changed thermostats, no change, finally I decided to put the orginal pullyes and fan blade back on, no change, I have changed the timing both was, no change, I fooled with this all last summer and fall, finally I quit taking longer trips in it till I could get some help, but I have done everything that I was told around here and from Ecklers. I would appreciate any ideas for you experts, because I'm a cabinet maker not a mechanic, LOL Thanks Rick
#2 Mar 11, 2008 at 8:00 amQuote:
Originally posted by mohrt A shot in the dark, but did you check at what temp the thermostat opens up? And, are you sure it is working properly?
I tried several thermostats with no luck, then I just removed the closer and just left the top section to maybe slow the water downs some, someone said maybe the hi flow water pump was pushing the water too fast and was not having enough time to cool it down. One other thing I thought of was buying a twin 12" electric fan and replace the single 12" one that is there now, hate to spend another 350.00 but if I thought for sure it would do the job, I would.. Just trying to get some new ideas from the crew. anyone else?
#3 Mar 11, 2008 at 9:50 amI own a 1979 vette and went through the same thing after a rebuild, checked out radiator, stat, electric fan, even tried different antifreeze. The thing that worked for me was when I installed the engine I put a flex fan on it and so I removed it and reinstalled the factory clutch fan and that solved my overheating problem, now if you are still running the stock fan maybe your clutch is bad! The fan clutch is operated by the temp of the air moving through the radiator as it heats up the clutch on the fan will engage, it normally spins free on the shaft that turns with the pulleys, it save drag (and noise) when it is not needed. So if your clutch is not engaging, it can't pull the heat from the radiator fast enough to keep up. The other thing it could possibly be is either a blown head gasket or cracked head (both my heads were cracked when I did my rebuild, late 70's early 80's heads were prone to cracking) in where you not losing antifreeze but as the engine warms the crack expands and the hot exhaust gasses are forcing themseleves into the cooling system. 's
Let me know what you find!
One other thing make sure your running a fan shroud, Corvettes have limited air flo through the grill so it is a must......
Edited Mar 11, 2008 at 9:54 am
#4 May 14, 2008 at 7:43 pmnot sure if you have a serpentine system or not but are you sure you have the correct water pump i know you changed it but if its a serpentine system its a reverse flow if not its a standard flow using the wrong pump will surely cause an overheating problem. just a thought,
Mike The g-body guy
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