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Old 08-17-2011, 08:12 AM
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40 Chev S/R Overheating Problem

Just got out of the Body Shop after a Five year visit, it has a 350/350, with A Walker A/C System including Radiator and Fans and Temp Switch in Rad
iator. One fan mounted back of radiator/ one mounted in front of radiator under/below A/c Condenser. Digital Dash board reads 235-45 Temperature
and stays there, I put a bottle to use as an overflow/recovery system as a
trial. The bottle filled up and when it cooled down nothing was drawn back to the radiator. I'm not new to to the Automotive world, I retired after over 40years in the business, I'm 72 now and pretty much disabled and useless under the hood. Any suggestions would be appreciated.
Thanks for allowing me to share. John Cochrane

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Old 08-17-2011, 09:53 AM
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Start by changing the radiator cap, sounds like you're losing the seal. Can you bypass your switches and have the fans running ALL the time to see if this makes a difference. you may have some air blockage from the fans themselves. 2 fairly easy things to check. Does the engine ping? Are the gauges accurate, the temp sender being the right one (OHMS) for the gauge? I had this problem myself, there are a BUNCH of temp senders for different gauges.

Here is a ton of info:Overheating Help!!!!
"When I was younger, I could remember anything, whether it had happened or not." - Mark Twain

Last edited by dinger; 08-17-2011 at 10:01 AM.
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Old 08-17-2011, 10:57 AM
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Thank you Dinger for the quick reply.
I already changed the cap. The sending switch has been on my mind, but it has been so many years since I/we bought the wiring harness, Digital dash and the Walker radiator set up with the fans. I had the idea that the fans were pushing against each other, but I have to depend on someone else to verify that. there was no "ping" when he drove it back from the body shop, a trip of about 15 miles. I will do some research and try to find where the sending switch came from?????
The air pocket might be something also, brings back memories with the ford rangers and some others that I had to lift the front end up in the air to get the air out of the cooling system. Again thank you, will keep you posted if I cure it. John
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