can a clogged heater core cause the motor to overheat? - S-10 Forum
 
LinkBack Thread Tools
post #1 of 6 Old 05-09-2010, 08:33 PM Thread Starter
Registered User
 
Join Date: Mar 2008
Age: 35
Posts: 38

User is: gotbags-10 is offline
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?

gotbags-10 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 05-09-2010, 09:21 PM
Registered User
 
AWD V8's Avatar
 
Join Date: Jan 2009
Location: Surrey, BC, Canada
Age: 62
Posts: 6,464

User is: AWD V8 is online now
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.
AWD V8 is online now  
post #3 of 6 Old 05-10-2010, 11:28 AM
goin broke but n style
 
S15vortecpwr's Avatar
 
Join Date: Jan 2007
Location: Wetumpka, Alabama
Age: 35
Posts: 12,927

User is: S15vortecpwr is offline
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.

94 GMC Noma 4.3 CPI auto - under construction
01 Trans Am Ws6 - Garage Queen

12 RAM 1500 CC Hem, stock for now, 17.9 mpg on avg.

01 GMC Noma 2.2L auto - SOLD
99 blazer 4dr 2wd - SOLD

GOIN BROKE BUT N STYLE
S15vortecpwr is offline  
post #4 of 6 Old 05-14-2010, 12:58 AM
i saw what you did there!
 
fast68chevy's Avatar
 
Join Date: Sep 2002
Location: Lincoln IL
Age: 38
Posts: 3,571

User is: fast68chevy is offline
Send a message via MSN to fast68chevy Send a message via Yahoo to fast68chevy Send a message via Skype™ to fast68chevy
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

many different vehicles parting out, engine underhood dash electrical and more parts! cars, trucks, fords, chevies, etc. - text me 217 671 7792 anytime! Own: '54 F350 dually, '54 & '57 F100's, '57 Bel Air gasser, '68 Corvair Monza 'vert. '72 Chevelle SS HT, '82 K10 SF, '85 Elky SS 310ci, '93 C1500 4.3L Z
fast68chevy is offline  
post #5 of 6 Old 05-14-2010, 09:46 PM
00BLKX FROM MAINE
 
00BLKX's Avatar
 
Join Date: Mar 2010
Location: LEEDS,ME
Age: 37
Posts: 345

User is: 00BLKX is offline
Re: can a clogged heater core cause the motor to overheat?

mine didn't , more chance of being the thermostat

00BLKX is offline  
post #6 of 6 Old 05-14-2010, 10:37 PM
Registered User
 
far2grumpy's Avatar
 
Join Date: Sep 2009
Location: Cedar Rapids, IA
Posts: 564

User is: far2grumpy is offline
Re: can a clogged heater core cause the motor to overheat?

Quote:
Originally Posted by fastr68 View Post
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.
far2grumpy is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the S-10 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.


Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome