help! coolant not circulating???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mxerchris · 04-28-2013, 04:06 AM

On pa-inlaws 69 w/350 temp gauge was pegging out he didn't think the truck was really getting that hot so he replaced the sending unit thought that it was fixed but after a couple short drives realized it was running hot so replaced the thermostat still not fixed hot water in upper hose cool water bottom hose so thought radiator was stopping up, he said let's go ahead replace it with an aluminum one, put it in still running hot?? It had an edelbrock water pump so thought maybe it was no good replaced it with new pump still doesn't circulate??? What could cause there to be blockage?? By the way could not get the bottom hose (old one or new one) to not leak at the water pump even with 2 clamps. Any help would be appreciated
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Square_78 · 04-28-2013, 06:14 AM

Radiator rusted out and plugged up? Lower hose collapsed or kinked?
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mxerchris · 04-28-2013, 07:25 AM

Brand new hoses, thermostat, water pump and aluminum radiator from classic industries still no circulation..
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midniteblues · 04-28-2013, 07:45 AM

is it the correct pump and not a reverse flow? also i have seen the impellers come loose on the shafts(not very common)

test the thermastat(or take it out and run it)

do a flush of the system(you would be amazed at what can come out of a cooling system)

belt slipping?

try a differnt guage

did you "burp" the system? it probally shouldve did it its self after a short ride.

in some cases a leaky head gasket can/will make it run hot, but you would notice bubbles in the rad

cdowns · 04-28-2013, 08:36 AM

have you taken a known good thermometer anf taken the actual temp of the coolant?

mxerchris · 04-28-2013, 04:56 PM

Haven't flushed the system yet, belts are tight and put on new water pump boiled thermostat on water is opening plus I can feel the hot water leaving the engine in the top hose so the thermostat is opening. What happens with the blown head gasket not noticing any pressure in the cooling system or water in the oil??
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04-28-2013, 04:06 AM	#1
mxerchris Registered User Join Date: Feb 2013 Location: calera Posts: 15	help! coolant not circulating???? On pa-inlaws 69 w/350 temp gauge was pegging out he didn't think the truck was really getting that hot so he replaced the sending unit thought that it was fixed but after a couple short drives realized it was running hot so replaced the thermostat still not fixed hot water in upper hose cool water bottom hose so thought radiator was stopping up, he said let's go ahead replace it with an aluminum one, put it in still running hot?? It had an edelbrock water pump so thought maybe it was no good replaced it with new pump still doesn't circulate??? What could cause there to be blockage?? By the way could not get the bottom hose (old one or new one) to not leak at the water pump even with 2 clamps. Any help would be appreciated Posted via Mobile Device __________________ 71 Cheyenne LWB, pdb, ps, ac with 68K original miles SeaRay SRV197

04-28-2013, 06:14 AM	#2
Square_78 Registered User Join Date: Mar 2012 Location: Okanagan Valley, BC, Canada Posts: 1,237	Re: help! coolant not circulating???? Radiator rusted out and plugged up? Lower hose collapsed or kinked? Posted via Mobile Device __________________ #teamlongbed "I refuse to go disc brakes. I actually love drum brakes. It makes for an adventure." - 50bomb 1978 Chevy shop truck - static 6/8" 1970 GMC 1500 - Accuair eLevel Resto-mod http://67-72chevytrucks.com/vboard/s...d.php?t=537497

04-28-2013, 07:25 AM	#3
mxerchris Registered User Join Date: Feb 2013 Location: calera Posts: 15	Re: help! coolant not circulating???? Brand new hoses, thermostat, water pump and aluminum radiator from classic industries still no circulation.. Posted via Mobile Device __________________ 71 Cheyenne LWB, pdb, ps, ac with 68K original miles SeaRay SRV197

04-28-2013, 07:45 AM	#4
midniteblues Registered User Join Date: Jul 2011 Location: strausstown pa Posts: 3,394	Re: help! coolant not circulating???? is it the correct pump and not a reverse flow? also i have seen the impellers come loose on the shafts(not very common) test the thermastat(or take it out and run it) do a flush of the system(you would be amazed at what can come out of a cooling system) belt slipping? try a differnt guage did you "burp" the system? it probally shouldve did it its self after a short ride. in some cases a leaky head gasket can/will make it run hot, but you would notice bubbles in the rad __________________ 81 camaro 355 4/spd 342 posi my first love. 67 swb step 454/4spd ott 373 posi 4/7 drop. 2000 s10 zr2 little blue truck that never gets stuck. '74 heald super bronc vt8. tecumseh powered moon rover.

04-28-2013, 08:36 AM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: help! coolant not circulating???? have you taken a known good thermometer anf taken the actual temp of the coolant? __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

04-28-2013, 04:56 PM	#6
mxerchris Registered User Join Date: Feb 2013 Location: calera Posts: 15	Re: help! coolant not circulating???? Haven't flushed the system yet, belts are tight and put on new water pump boiled thermostat on water is opening plus I can feel the hot water leaving the engine in the top hose so the thermostat is opening. What happens with the blown head gasket not noticing any pressure in the cooling system or water in the oil?? Posted via Mobile Device __________________ 71 Cheyenne LWB, pdb, ps, ac with 68K original miles SeaRay SRV197



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