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Click on image for the lowdown. 
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| | | Forums66 Topics128,014 Posts1,055,329 Members48,419 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | Could be air trapped in system. Google "Burping" a motor. Park up hill.
Could be over heating. Watch the gauge.
Could be too much fluid in Rad.
Could be water pump running backwards.....wrong water pump
Could be a screwed up "new" core install
Please always state what motor, as well as year and model.
Is there steam? Bubbles? Thermostat correct/new? Overflow tank installed?
I have read that heater hoses on backwards can cause bubbles. I don't know if that's true.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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