I have a 1985 K20 with a new reman 454 it seems to get very hot and goes into vapor lock. once it cools it runs like a champ. I replaced everything, from the thermostat, to the clutch fan and clutch.

Asked by Feb 13, 2015 at 01:26 PM about the 1985 Chevrolet C/K 20

Question type: Maintenance & Repair

New radiator and new carburetor, new water pump. Please help! The fuel is boiling in the
carb! It gets to 220 and shuts down, when it reaches 200 I can start it up again!

3 Answers

39,195

Try getting an air bleed kit at the auto store. You may have a large air pocket in the cooling system. Check to see if your fan was put on the right way. I have actually seen a case where the shop somehow managed to put the fan on backwards causing an overheat condition. You can test by putting a piece of newspaper over the grill with the truck running and the hood closed. If the paper sticks to the grill then the fan is on right. If it blows the paper off the grill, it's on backwards.

Thank you I checked the fan, it was installed correctly. I will check the air pocket. I did test for carbon dioxide in the coolant, it was negative!

18,575

Sounds like low fuel pressure. 220 isn't hot enough to do this alone. Make sure your fuel likes are not running along the exhaust

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