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01-05-2008, 11:50 AM | #1 |
The Original HotRod KnifeMaker
Join Date: Jan 2007
Location: Tenino, Washington
Posts: 811
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Overheating- all of a sudden
I have been driving my truck [69 GMC w/early 68 396, double electric fans with adjustable thermostat, shrounds] for a few months now, with some work breaks in between.
It has always run very well with no problems. The fan most always comes on after engine shut down- as it should- to deal with the temp from stopping the water circulation. Today when I got home from work steam started blowing under the hood. I hit the manual override for the fans, but it didn't help. The fans come on with the override. I let the truck cool for about three hours, refilled the radiator and started it up. I kept watch on the fans- they didn't come on. The truck got hot enough to blow some steam again, so I am parking it until the weekend. The fans still come on with the override. The radiator is less than a year old, 4 core. Is there a logical answer to this or are there two problems out of the blue? In which order and how do I narrow this down to the problem? Engine Thermostat? Water Pump? Fan thermostat? Something else? I did a search on overheating and didn't find anything like this- running fine, now not. How do I check each item? I don't want to throw new parts at it until I get lucky... Thanks, .
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Dave 69 GMC SWB 2WD 454 Turbo 400 |
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