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Old 01-10-2013, 09:32 AM
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350 overheating problems

I have replaced the thermostat, and the radiator and my '85 Chevy is overheating bad, 350 motor 1990. I red-lined it to town but was still able to touch it with my bare hands on both valve covers.

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Old 01-10-2013, 10:53 AM
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Quote:
Originally Posted by chrisnjens View Post
I have replaced the thermostat, and the radiator and my '85 Chevy is overheating bad, 350 motor 1990. I red-lined it to town but was still able to touch it with my bare hands on both valve covers.
Do you have electric fans or mechanical fans bolted on to the water pump. If bolted to water pump it may be the clutch fan lets the blades spin and they look like they are moving air but not really. CHeck to see if the blade can be turned with little force when the engine is hot and not running of course. If it turns easy it is probably the clutch.

Also check the sender and wire to the sender. Does the car overheat and boil water out of the radiator?
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Old 01-10-2013, 12:38 PM
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overheating w/o a hot engine

mechanical fan and the water boils but not out i can open the radiator without shutting the truck off. A while back the ex-radiator bounced out and clobbered the fan but when i replaced the radiator the truck was running great until a few days ago. I started her up and within 10mins. she was almost red-lining. Thank you soooooo much for your help and advice it is ever so much appreciated.
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Old 01-10-2013, 12:51 PM
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Make sure you don't have a air pocket trapped in the motor...Also you said a new thermostat.. Did you check it ??? Sometimes you will get a bad one.. (Even new)..
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Old 01-10-2013, 12:57 PM
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low coolent levels could cause this if you top the radiator off when its cool thats not enough for when the thermostate kicks on it dumps that water into the block and which in return lower the amount in the radiator.
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Old 01-10-2013, 12:58 PM
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Actually I don't think the other thermostat was bad, my truck was leaking antifreeze out of or near the water pump. I'm trying that next is a new pump. And thank you because i have gotten a bad thermostat before and didn't know how to test it back then but you have to boil it right? Thank you soo much for your help.
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Old 01-10-2013, 01:05 PM
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Originally Posted by chrisnjens View Post
Actually I don't think the other thermostat was bad, my truck was leaking antifreeze out of or near the water pump. I'm trying that next is a new pump. And thank you because i have gotten a bad thermostat before and didn't know how to test it back then but you have to boil it right? Thank you soo much for your help.
Yes, you have to boil it..
If you had a leak around the pump.. Change it.. It's your problem..
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Old 01-10-2013, 01:23 PM
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thank you so much for your help and advice it helps alot and i am working on getting a pump. thank you
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Old 01-10-2013, 01:24 PM
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Could be a relay not turning electric fan on. If car runs cool while driving on highway but heats up at traffic lights it is a fan or relay problems. If it is hot all the time then it is probably a stuck thermostat or water pump failure. Good luck.
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Old 01-10-2013, 01:25 PM
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thank you so much for your help and advice it helps alot and i am working on getting a pump. thank you
The water pump has a little hole under it,, This will usually leak when the pump is bad..
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Old 01-10-2013, 01:34 PM
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thank you i ordered a pump and am thinking about a flex fan
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Old 01-10-2013, 03:33 PM
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Don't use a flex fan unless you like holes in your hood. They're known to fail.
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Old 01-10-2013, 03:47 PM
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Quote:
Originally Posted by chrisnjens View Post
thank you i ordered a pump and am thinking about a flex fan
Flex fans are solid mount your fan has a clutch did you replace the clutch when the fan was hit. Is the clutch good. If the car is hot you should not be able to turn the fan unless you put alot of force on it. They do let up when cool. Keeps the fan from running full speed when it cold outside and makes it lock up when the car and air temps go up.

If you turn the engine off and its reading hot the water should boil over instantly and burn the crap out of you. Even a good running car will do this when at operating temp. If not then your not running hot you guage is bad. Try another sender if you have one easy to swap out. Also only 15 bucks.

If water is coming out of the pumps wheap hole its bad and is probably most of your problem. Smetimes if you have lots of rusty water it will eat the blades right off the pump and you will be turning nothing.
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Old 01-10-2013, 04:06 PM
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thank you for all your help i really appreciate it!
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Old 01-10-2013, 04:13 PM
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Thank you to EVERYONE!!

I really appreciate all the help, info, and advice. Don't know where i'd be without your help everyone
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