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Radiator always overheat? - Cars & Trucks

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There could could only be a few things that could cause this, First With the engine cool, remove the radiator cap and start the engine and let it warm-up. Inspect by looking into the radiator to see if the radiator has water movement *FLOW*, or the water stands still. If it has movement the water pump is working. Second put the radiator cap on and when it starts to overheat squeeze top top radiator hose to see if it is really tight. If it is then the thermostat is stuck closed and will not allow the water to flow into the engine causing the water in the engine to overheat because it can not receive cooled water into the block. Third if you have *FLOW* in the radiator and the thermostat is open, check the exhaust to see if there is an unusual amount os steam vapor or water dripping out of the tailpipe. If this is the case then you have one, Maybe two of three things (Blown Headgasket, Warped Head, or Cracked Head). Finally the Cooling System may need to be Back Flushed. You can buy a kit at any auto parts store to do this and is fairly easy to do (Even for a shadetree mechanic). Hope this helps !

Posted on Apr 24, 2015

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Have a compression test done to determine if head gasket or cracks
next have a coolant pressure test done to check for leaks
have a flow test done on the radiator to check for blocked cores
check and bleed any air from the cooling system
if the over heating occurs at lights or in slow traffic check that the fans are coming on
If you have a viscous fan hub (Vehicle not specified ) then the lights and low speeds in traffic the over heating will be the viscous hub.
if it occurs at speed ,check that over drive is engaging
run the fault codes to check that the engine is in tune and no sensors are faulty.

Posted on Apr 24, 2015

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