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cooling system nightmare HELP!!!!!

 
  #1  
Old 05-13-2011, 06:40 PM
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cooling system nightmare HELP!!!!!

Truck runs great gauge never gets hot , but you drive for more than 15 20 mind then shut it off, its ok for a minute then the coolant starts to boil. I hear and feel it bubbling in the upper hose. Rad was plugged so I replaced it as well as motorcraft thermostat and motorcraft coolant. Its still doing it. Coolant level doesn't drop I topped off once when I first test drove after rad replacement. Its making me mad and Im scared its something real bad like a head gasket.....please offer any advice experience or guesses, ill listen to anything!!!! 93 4.9 e4od 2wd
 
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Old 05-13-2011, 08:07 PM
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Did you install the thermostat that correct way? the spring shold go into the block. Ive installed it bckwards before and it made the gurgle noise

Hope this helps! Just a suggestion
 
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Old 05-13-2011, 08:09 PM
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Its in spring to block and weep hole pointed up, I triple checked that one
 
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Old 05-13-2011, 08:18 PM
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Yeah and for the life of me i always forget or second guess myself.

My other thought is that since you just recently replaced all that stuff, there are air pockets escaping from the system.

Pressure test your Radiator cap as well

Also, fire your truck up and spray starting fluid around your head gasket, if it idles up, you have a bad head gasket.

Its all about diagnosis!
 
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Old 05-13-2011, 08:22 PM
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you need to put a gauge on it also to verify the temp. does the motor take 15 min to get to operating temp??? take the rad cap off and start the truck let it idle and wait for it to act up if its a head gasket then you should be able to tellwhat cyl by pulling the plugs one at a time keep us informed at what you find
oh and it could be just a worn waterpump thats not moving the coolant very well seen it in a few cars
 
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Old 05-13-2011, 09:50 PM
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Well im beginning to wonder since the rad was plugged could the water pump be shot?
 
  #7  
Old 05-14-2011, 04:02 AM
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its possible, very possible
 

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