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can a clogged heater core cause the motor to overheat?

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Old 05-09-2010, 08:33 PM   #1
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can a clogged heater core cause the motor to overheat?

Just like the title. I noticed my heat is blowing cold so i think my heater core is clogged again. Top hose is cold while bottom is warm. I just didn't know if it would cause the motor to overheat or if i should look elsewhere. I've noticed it will overheat then randomly drop down to normal temp. I just replaced the thermostat about 2 months ago so i don't think its that. Maybe the radiator? Or can a heater core do all that?
Old 05-09-2010, 09:21 PM   #2
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Re: can a clogged heater core cause the motor to overheat?

The lack of circulation through the heater core will affect the cooling very little. If that is all it takes to overheat the engine, then your cooling system is compromised already.

The heater core plugged is likely an indication of a greater problem in the rest of the system. If you rad and block are coated with crap the heat transfer is greatly reduced. Sounds like you need an aggressive cooling system flush.
Old 05-10-2010, 11:28 AM   #3
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Re: can a clogged heater core cause the motor to overheat?

or when you put yout t-stat in you left air in the system. a coolant temp sensor can not read air. it has to read a liquid.

you can have a stopped up rad. easy way to tell is remove cooling fan and shroud. crank eng let get hot and feel rad. if you feel cold spots than your rad is clogged.
Old 05-14-2010, 12:58 AM   #4
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Re: can a clogged heater core cause the motor to overheat?

radiator would be different temps in different places on the rad

also one rad hose will feel different temp than the other

but thats commonly caused by failing thermostat


you should replace fluid once everyt year or two at the most especially in alum radiator vehicles

mines over due but im gonna do it sooner than later

i need to remove the lower hose heater fro the truck anyways for the summer and put on a non modified hose

i might as well remove and have the rad flushed the same time

good luck
Old 05-14-2010, 09:46 PM   #5
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Re: can a clogged heater core cause the motor to overheat?

mine didn't , more chance of being the thermostat
Old 05-14-2010, 10:37 PM   #6
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Re: can a clogged heater core cause the motor to overheat?

Quote: Originally Posted by fastr68
radiator would be different temps in different places on the rad

also one rad hose will feel different temp than the other

but thats commonly caused by failing thermostat
I was with you until last sentence ... on my 04 truck there's approximately a 30 degree drop in temperature from top hose to bottom hose.

Assuming you have adequate airflow through radiator, fins should become increasing cooler as coolant circulates from top to bottom of radiator (and lower hose and return to water pump).

I checked my temps with a non-contact IR thermometer - great tool to have.
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