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#1
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Engine Overheat Problem
Have a 68 Buick with a 430 V-8. The "Hot" light comes on when the car
has been driven and then sits with then engine off for approximately 20 min. If the car is started and the light comes on, I can rev the engine up a bit and the light will go out. If I drive it below 75mph the temp light stays out...if I drive it fast...then slow down and drive 65mph...the light eventually comes on. The engine was rebuilt about 2 yrs ago, the engine has a new radiator, water pump, themostat and temp sensor. I took a chance and replaced the water pump....no such luck. The sensor was checked to make sure it works...works fine. I am thinking about replacing the radiator and finding a differant fan. Any thoughts? Please contact me at . Thanks! |
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#2
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Engine Overheat Problem
Before dumping any more money into it, I would measure the temperature going
into and coming out of the radiator. This will tell you if it is doing its job or if it might be a sensor problem. Some engines will get hotter when shut off because of residual heat that is not taken away by circulating water. How stock is the engine, fan, and radiator? Is it missing a fan shroud? Are the pulleys the correct diameter? Could be timing or carburetor adjustment. The obvious is the thermostat. Has it always done this or is it a new problem? Was coolant used when parts were new? water only would cause corrosion. > wrote in message ups.com... > Have a 68 Buick with a 430 V-8. The "Hot" light comes on when the car > has been driven and then sits with then engine off for approximately 20 > min. If the car is started and the light comes on, I can rev the > engine up a bit and the light will go out. If I drive it below 75mph > the temp light stays out...if I drive it fast...then slow down and > drive 65mph...the light eventually comes on. > The engine was rebuilt about 2 yrs ago, the engine has a new radiator, > water pump, themostat and temp sensor. I took a chance and replaced > the water pump....no such luck. The sensor was checked to make sure it > works...works fine. I am thinking about replacing the radiator and > finding a differant fan. Any thoughts? Please contact me at > . > > Thanks! > |
#3
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Engine Overheat Problem
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#4
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Engine Overheat Problem
Scott Dorsey wrote: > > Is the fan actually turning properly? If high engine RPMs makes the > light go out, it sure seems like you don't have proper airflow. I may be wrong but I think he is saying that high speed driving is what causes the light to come on. He said "If I drive it below 75 mph the temp light stays out...". Of course he said other things that seem to contradict this also so we have to guess what he is really meaning. But, if high speed is truly the only thing that leads to the light coming on, I would guess the gauge is accurate (at least relatively speaking). It clearly is getting hotter when driving 75 mph than it normally does which it shouldn't. The sending unit might be a little bit extra sensitive but there isn't anything about high speed driving that would cause the gauge to behave differently other than temperature. There are a couple things that immediately come to mind that might cause this. Lower radiator hose collapsing (partially blocking flow) and bad distributor advance. If the mechanical or vacuum advance in the distributor are not working the engine produces a lot of extra heat at high speeds. -jim ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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