Classic Trucks '47-'98 GM Trucks - Performance | Conversions | General Discussion

Newbie here with some questions

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Old 07-30-2009 | 01:05 AM
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Anyone have any opinions why this thing is still over heating?
Old 07-30-2009 | 08:41 AM
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Man I don't know what to tell ya. Take the water pump off and run a pressure washer wand in each side of the water pump inlet/outlet. Is the coil still in the lower radiator hose? Is any hose colapsing?
Old 07-30-2009 | 11:53 AM
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how is it oveheating. Is it overheating while your at an idle, or driving, or under a load driving? If its overheating at an idle pretty quickly and youve flushed it, got a good rad, and did the thermostat and pump then id say you have exhaust super heating your coolant. Cracked head or blown head gasket. Start the truck cold, pop the radiator cap, and let it idle and look for bubbles
Old 07-30-2009 | 11:17 PM
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I haven't driven it. Only watched it at idle. I'll look at it saturday and see if theres any bubbles. Thanks for your guys help. I've done all I could think of and wanted to knock out all options hoping it wasn't really bad news. but like you guys say its gotta be bad. new water pump, stat, hoses, radiator, lol not looking good. I'll look for bubbles and do a compression test as well. I'm still hoping its minor
Old 08-08-2009 | 07:16 PM
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The coil is still in the bottom hose. changed water pump and thermostat today. I hooked up the temp guage and it stayed at a little below 210 all day long. Was fine until I shut the truck off and it boiled over.........
Old 08-08-2009 | 11:18 PM
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Originally Posted by lowchevytrucks8503
The coil is still in the bottom hose. changed water pump and thermostat today. I hooked up the temp guage and it stayed at a little below 210 all day long. Was fine until I shut the truck off and it boiled over.........
Is it coming out the over flow hose? Do you have an expansion tank?
Old 08-09-2009 | 08:03 PM
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its blowing out the top of the radiator even with the cap on. I have an overflow tank not sure about expansion tank
Old 08-09-2009 | 10:34 PM
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Originally Posted by lowchevytrucks8503
its blowing out the top of the radiator even with the cap on. I have an overflow tank not sure about expansion tank
overflow expansion..same diff. Have you changed the radiator cap? If they get old they get weak and pressure could be overcoming the spring. Don't know man, grasping for straws....
Old 08-13-2009 | 12:30 PM
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It's fixed! for now anyways lol. I took the cap off and looked the neck was out of shape more oval then round. I used a hammer and punch and got it almost perfect....... I also swapped the clutch fan.
The clutch fan had no pressure. I took it off and I could spin it by hand.
Should it have pressure while cold? or only hot?
Old 08-13-2009 | 01:11 PM
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Originally Posted by lowchevytrucks8503
It's fixed! for now anyways lol. I took the cap off and looked the neck was out of shape more oval then round. I used a hammer and punch and got it almost perfect....... I also swapped the clutch fan.
The clutch fan had no pressure. I took it off and I could spin it by hand.
Should it have pressure while cold? or only hot?
Clutch fan's should have tension all the time, I'll bet you found your issue. Keep her running man!


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