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


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!


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

Your Answer

Add photo

Related Questions

  • Clutch Fan 28 answers

    My clutch fan was engaged at idle and running fast. However I did not see any check engines to indicate a bad clutch fan. I checked the relay and fuse, I also checked there was power going to the plug...

    2004 Chevrolet TrailBlazer LS 4WD


    Maintenance & Repair

  • Fan Clutch Code P1481 6 answers

    I have a 2003 Trailblazer LS. I was sitting idle the other day and noticed the temperature gauge was over 210 degrees and the a/c was blowing hot air and the service engine light came on. Shut the tru...

    2003 Chevrolet TrailBlazer LS


    Maintenance & Repair

  • How do you check to see if a clutch fan it's functioning properly? 6 answers

    I've rodded the radiator, changed the thermostat and verified the water pump is working. All I can figure is maybe the clutch fan needs replaced but when I kill the motor the fan stops spinning im...

    1989 Chevrolet C/K 3500


    Maintenance & Repair

  • Witch direction does the engine cooling fan go on a 1990 k3500 454 TBI . 3 answers

    I'm replacing the cooling fan on my 454 Chevy engine and need to know which direction does the band go on? I know there's a way it's his front on it stamped but my fan that I bought does not have th...

    1990 Chevrolet C/K 3500 Ext. Cab 4WD


    Maintenance & Repair

  • why truck won't start after it get hot maybe twenty minutes running 43 answers

    1990 f150 with 300 six. vehicle runs great, starts right away even after sitting up for three or four months. it' fuel injected. once you drive it for twenty, thirty minutes, it will not start. le...

    Ford F-150


    Maintenance & Repair

C/K 20

Looking for a Used C/K 20 in your area?

CarGurus has 22 nationwide C/K 20 listings and the tools to find you a great deal.


Search Chevrolet C/K 20 Questions

Chevrolet C/K 20 Experts

#1 F_O_R
Reputation 100
#2 kayzen
Reputation 80
#3 Runningfree1988
Reputation 60
View All

Related Models For Sale

Used Ford F-150
2,264 Great Deals out of 209,447 listings starting at $1,499
Used Ford F-250
471 listings starting at $3,975
Used Ford F-100
169 listings
Used Chevrolet Camaro
150 Great Deals out of 32,742 listings starting at $1,729
Used Chevrolet Blazer
1,152 listings starting at $700
Used GMC C/K 10
7 listings

Used Cars For Sale