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  #21  
Old 04-08-2016, 08:39 AM
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when it gets hot, both tanks, both hoses are hot. Heater blows hot. When it cools down, it generally will cool down fast.. sometimes, idling will do it, or it'll do it on it's own.. It's so random, it's hard to trace
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  #22  
Old 04-08-2016, 09:20 AM
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You really got me stumped. It seems like the water pump stops pumping for a short time. The only problem with that thought is there are only three things that will stop the pump from doing its job. One is a blockage which you know is not there, second is there is nothing to drive the pump, again, you know that's not the cause, and three is air. If there is an air bubble that gets to the pump it will stop pumping. Since this has been on going and doesn't present itself often then I am wondering if there is a bubble 'stuck' somewhere? Have you jacked up the front of the truck?
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  #23  
Old 04-08-2016, 10:28 AM
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I've considered pulling a high vacuum, somehow, on the coolant system to try and pull any air pockets through, but not sure if/how that would work..
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  #24  
Old 04-08-2016, 10:48 AM
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In theory that would work, however I question the ability to make it work due to the rubber hoses collapsing. Have you tried to lift the front of the truck?
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  #25  
Old 04-09-2016, 08:44 PM
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Quote:
Originally Posted by MnTom View Post
In theory that would work, however I question the ability to make it work due to the rubber hoses collapsing. Have you tried to lift the front of the truck?

Speaking of 'collapsing hoses'.. does your lower hose have the anti collapsing spring inside?
I think I remember you saying you put new hoses on with the new radiator..
collapsed hose is tricky to spot; engine needs to be hot, thermostat wide open, and give it some revs. And you need to be watching the hose while doing it! It may be just like a toothpaste tube under those conditions
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  #26  
Old 04-10-2016, 08:54 AM
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Everytime I change out a hose, just flush or fill, change thermostat, ect .. I always pull the thermostat and fill from there, slowly and when filled, reconnect the thermo housing. Then slowly fill the radiator full from the rad cap. Then after a day of use, I check the level and usually only need to cap it off once, very little, for the rest of the service time. Filling it completely connected and from the rad cap opening always gave me pockets of air I fought with for days or weeks. Just a thought.
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  #27  
Old 04-10-2016, 08:56 AM
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Quote:
Originally Posted by anoldbiker View Post
Everytime I change out a hose, just flush or fill, change thermostat, ect .. I always pull the thermostat and fill from there, slowly and when filled, reconnect the thermo housing. Then slowly fill the radiator full from the rad cap. Then after a day of use, I check the level and usually only need to cap it off once, very little, for the rest of the service time. Filling it completely connected and from the rad cap opening always gave me pockets of air I fought with for days or weeks. Just a thought.
Yep, thats how i did the refill.

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SOLD: 96 2500 sclb 4x4, 5spd swap, cam, stack, #10, bhaf, 16.5*, 27mpg
SOLD: 01 2500 qcsb 4x4 HO 6spd, 2" level, 5" exh., Edge Juice, bhaf, 16mpg
SOLD: 97 3500 cc-drw, built 47re, 3 disk, 4" exh., #100, bhaf, gauges
SOLD: 02 QCSB 2500 4x4 5.9-auto
SOLD: 97 ECLB 2500 4x4 V10-auto.. junk..
CURRENT:'06 2500 ThunderRoad QCSB 5.9CTD 4x4, built Auto; '02 Silverado 2500HD 6.0L CrewCab LB 4x4; '14 vw cc r-line 2.0t 6 speed

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  #28  
Old 04-10-2016, 09:58 AM
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What about opening the water jacket on the head to see if there is an air bubble there.
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  #29  
Old 04-26-2016, 10:15 AM
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Ever find the problem ?
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  #30  
Old 04-30-2016, 11:22 AM
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Not yet. It still happens. I've got a V10 with a bad engine and a good radiator that looks to fit his truck. We may swap that in to test. I told him to test the coolant for exhaust gasses, but don't think he's done that yet. He also has a pretty badly ticking injector that needs replaced, so he may be buying new injectors if he can find them priced affordable.

We'll see, and I'll definitely update once we make some headway.
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SOLD: 96 2500 sclb 4x4, 5spd swap, cam, stack, #10, bhaf, 16.5*, 27mpg
SOLD: 01 2500 qcsb 4x4 HO 6spd, 2" level, 5" exh., Edge Juice, bhaf, 16mpg
SOLD: 97 3500 cc-drw, built 47re, 3 disk, 4" exh., #100, bhaf, gauges
SOLD: 02 QCSB 2500 4x4 5.9-auto
SOLD: 97 ECLB 2500 4x4 V10-auto.. junk..
CURRENT:'06 2500 ThunderRoad QCSB 5.9CTD 4x4, built Auto; '02 Silverado 2500HD 6.0L CrewCab LB 4x4; '14 vw cc r-line 2.0t 6 speed

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