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Replaced thermostat took a compression test the low was148 the high was 178 there seems to not having waterflow back to the top radiator hose

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  • Cars & Trucks Master
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You don't specifiy what vehicle you have but I would guess a GM product.
I don't understand what you tested the comperstion on radiators /colling systems need to hold 14.2 lbs then the cap vents into the recovery bottle and in turn gets sucked back into the system how much pressure do you think the little impeller on the water pump can create the system isn't filled to the brim with antifreeze .It just needs to circulate it.
The problem is a blockage could be the radiator could be the heater core could be the pump .
You could try removeing the thermostat and running it .It might work for a while but its not a long term solution.
My advice is dump the antifreeze back flush the whole system includeing the block witch means opening the block drains takeing the hoses off the heater core and flush that to then see what you have got .Look at what comes out how much rust .
That is the real problem the rust it comes from the inside of the block and clogges the calaperys in the radiator and heater core binds up the thermostat and isn't to good for the water pump bearing eighter .

Posted on May 02, 2015

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  • Cars & Trucks Master
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You won't until the thermostat opens. The open temp is on the unit or box. Check your particular model online at owners forums etc to see if airlocks are a problem. If all else fails remove the thermostat temporarily and see if there is a return flow then. You don't say what the original problem was / is?

Posted on May 02, 2015

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Posted on Jan 02, 2017

stormbrewin
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SOURCE: Coolant filling up overflow bottle

You may need to ask AAA to put a radiator pressure tester on the resevoir bottle and pump it up to operating pressure(Pressure cap rating) and see if it over pressurises while it is running at operating temp,rev engine up and down and watch what the testers pressure readings do,it should move up and down in sync with the water pump.If the pressure keeps building i would have to believe that combustion chamber gases are over pressurising your cooling system.Also test the pressure cap is functioning within factory specs.

Posted on Oct 30, 2008

alicantecoli
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SOURCE: coolant problems 2000 vw jetta

plastic impeller on water pump has come adrift

Posted on Dec 22, 2008

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SOURCE: 1997 cadillac sls overheating

Allow it to cool down and refill system while running with heater on hot. Hopefully this will get the air out of the system. However, if this condition persists, have the radiator checked for hydrocarbons. These engines are sensitive to overheat and you may have blown a head gasket. (hope not)
Good luck!

Posted on Mar 25, 2009

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SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat

Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.

Posted on Nov 19, 2009

postings909
  • 130 Answers

SOURCE: replaced water pump, thermostat, radiator, top and

HAVE YOU CHECK YOUR FAN?????? THE OPERATION OF THE CLUCH OR ELECTRIC FAN PROPER OPERATION????

Posted on Aug 04, 2010

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