Does coolant flow thru heater always? - Chevelle Tech
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post #1 of 20 (permalink) Old Jan 10th, 20, 6:19 PM Thread Starter
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Does coolant flow thru heater always?

Still dealing with over-heating issues with my 70 Chevelle. Won't go thru in detail the list of things we have done to try and fix this but after new upgraded aluminum radiator, new electric fans and bigger alternator, upgraded water pump, flushing, re-flushing, new tsat, new gauges, timing changes, new belts, hoses, etc. it is still overheating. One thing we did do when putting in new radiator was to disconnect heater hoses (don't need a heater here in Hawaii). My question here is, do you think reconnecting heater would help with cooling problems? Thinking that the heater core acts like another small radiator, but does the coolant flow thru the heater core if the heater isn't turned on? Do you think it's worth it to reconnect heater and would I need to have heater running to make that difference?

Thanks, Ben.

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post #2 of 20 (permalink) Old Jan 10th, 20, 6:47 PM
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Re: Does coolant flow thru heater always?

Its those details that you left out that will create the next 10 posts of questions. What temp is your engine reaching at both idle and cruise? What is the temp setting of your thermostat?

While the late 67 and before cars had coolant flowing all the time, I believe that the 68 and up had a heater control valve that turned the flow off if the heater was off or the a/c was on.

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post #3 of 20 (permalink) Old Jan 10th, 20, 7:33 PM
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Re: Does coolant flow thru heater always?

Just looking at one of your other threads. What gears do you have in that car seeing you say it heats up on the highway and is the radiator big enough.

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post #4 of 20 (permalink) Old Jan 10th, 20, 8:16 PM
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Re: Does coolant flow thru heater always?

I believe you only had a heater control valve (1970) if the car had AC. Get yourself an infrared temperature gun, then you can easily rule out things. and get the true temperature the motor is running at.
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post #5 of 20 (permalink) Old Jan 10th, 20, 9:14 PM Thread Starter
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Re: Does coolant flow thru heater always?

I have the gun and have been working on a recommended list of things to do to get the temps down from this site for quite some time now. Hence the new, larger radiator, etc. That's why I didn't include all the details because I'm working thru list. But was curious about the one step we did of unhooking the heater and if anyone knew if that would make any difference.

1970 Chevelle SS (clone)
454 cid (496 stroker)
Holley 4 bbl 750 cfm
Muncie M21 (Hurst shifter)
Long tube headers
Tuxedo Black - black interior
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post #6 of 20 (permalink) Old Jan 10th, 20, 10:20 PM
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Re: Does coolant flow thru heater always?

It would help cool the engine coolant down some IF the heater fan was on but the heat it would be dissipating would wind up in the cabin.

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post #7 of 20 (permalink) Old Jan 10th, 20, 10:51 PM
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Re: Does coolant flow thru heater always?

I agree with Dean that it would help cool down some if your heater was on and running, but this is not the reason you are overheating.

It is not going to matter if you have the heater core hooked up or not in order to solve why your car is running hot.
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post #8 of 20 (permalink) Old Jan 10th, 20, 11:31 PM
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Re: Does coolant flow thru heater always?

Quote:
Originally Posted by chevyhawaii View Post
I have the gun and have been working on a recommended list of things to do to get the temps down from this site for quite some time now. Hence the new, larger radiator, etc. That's why I didn't include all the details because I'm working thru list. But was curious about the one step we did of unhooking the heater and if anyone knew if that would make any difference.
Then the answer to your simple question is no.

Your just jealous because you can't hear the voices!

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post #9 of 20 (permalink) Old Jan 11th, 20, 1:52 AM
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Re: Does coolant flow thru heater always?

Pics of what is in front of the Rad Core/Grill side
and what it ,looks like on the Engine side
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post #10 of 20 (permalink) Old Jan 11th, 20, 7:28 AM
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Re: Does coolant flow thru heater always?

This should help to show you your answer...

https://www.chevellestuff.net/tech/cooling.htm

...if the heater core is connected it is always circulating coolant so the added volume of coolant should help keep the temp down somewhat.But unless the heater is blowing air it doesn't really make a big difference.I know there were times when my Buick would run hot I had to run the heat on high to get to a place where I could cool it down.
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post #11 of 20 (permalink) Old Jan 11th, 20, 9:37 AM
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Re: Does coolant flow thru heater always?

Ben,

I also have a 496, itís in a Ď71 car so the radiator support & radiator flow is the same as yours.

I have no overheating issues, hereís what I have:

-Griffin aluminum radiator (25 + years old), twin 1.25" tubes
-CVR 55 GPM electric water pump
-Delay relay keeps the pump running for 90 seconds after engine shut down
-Large coolant expansion (overflow) tank
-15 PSI radiator cap
-Robert Shaw high flow 180 degree thermostat
-No heater connections
-No thermostat (intake manifold) by-pass hose
-1/8" holes drilled in the thermostat to allow warm-up by-pass
-Dual high flow electric fans
-Fans come on half speed at 170 degrees, full speed at 190 degrees
-Automatic transmission and engine oil have separate external plate style coolers
-60% water, 40% coolant mix

Sitting in traffic on a 90 + degree day, my 600 HP engine runs around 200 degrees. I havenít yet used the air conditioning.

Itís important to keep in mind that at idle engine speeds, the stock water pump and fan is hardly moving any coolant or air.

About the coolant: The higher percentage of water you have in the system, the better it absorbs and releases heat. Only use Prestone un-mixed and use supermarket distilled water. Ben, as youíre in Hawaii, you may only need like 10% water in your system.

Itís also important to use high flow fans. Most aftermarket electric fans have pretty a low CFM rating. Iíve been using high flow fans from a 1986 Toyota Camry V6 station wagon-and they work great. Half for looks and half for more airflow, Iím upgrading to a pair of Perma Cool 19114 fans which flow a ridiculous 2,950 CFM each, Iím making a proper aluminum shroud for them.
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post #12 of 20 (permalink) Old Jan 11th, 20, 9:44 AM
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Re: Does coolant flow thru heater always?

My custom overflow tank.
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post #13 of 20 (permalink) Old Jan 11th, 20, 10:17 AM
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Re: Does coolant flow thru heater always?

hi
To fix overheating a lot more detail is needed
When is it overheating idling or 40-60mph ??
Radiator can have 1/2 inch tubes upto 1 1/4 tube .So how wide and how many 1,2,3,4 ????
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post #14 of 20 (permalink) Old Jan 11th, 20, 2:53 PM
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Re: Does coolant flow thru heater always?

Quote:
Originally Posted by paul bell View Post
Ben,



Itís important to keep in mind that at idle engine speeds, the stock water pump and fan is hardly moving any coolant or air.

About the coolant: The higher percentage of water you have in the system, the better it absorbs and releases heat. Only use Prestone un-mixed and use supermarket distilled water. Ben, as youíre in Hawaii, you may only need like 10% water in your system.

Itís also important to use high flow fans. Most aftermarket electric fans have pretty a low CFM rating. Iíve been using high flow fans from a 1986 Toyota Camry V6 station wagon-and they work great. Half for looks and half for more airflow, Iím upgrading to a pair of Perma Cool 19114 fans which flow a ridiculous 2,950 CFM each, Iím making a proper aluminum shroud for them.
Paul,I'm sure you meant to say 10% coolant, right ? Too much coolant is a definate no-no as you probably already know
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post #15 of 20 (permalink) Old Jan 11th, 20, 4:53 PM
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Re: Does coolant flow thru heater always?

Quote:
Originally Posted by 71350SS View Post
Paul,I'm sure you meant to say 10% coolant, right ? Too much coolant is a definate no-no as you probably already know

hahaha yessir, 10% coolant, 90% water.


Darn "edit" expires so quick...................
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