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heater core bypass before I start

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Old Sep 27, 2021 | 02:48 PM
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Car: 1987 5.7 IROC-Z28
Engine: 5.7 TPI
Transmission: Auto
heater core bypass before I start

heater core bypass will connect from throttle body hose in pic 1
To hose on left traveling to water pump in pic 2 correct?

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Old Sep 27, 2021 | 02:49 PM
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Re: heater core bypass before I start

Heater control or heater core bypass?
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Old Sep 27, 2021 | 04:02 PM
  #3  
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From: Texas
Car: 1987 5.7 IROC-Z28
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Transmission: Auto
Re: heater core bypass before I start

Both. the diagrams i have seen show running the throttle body exit hose to the radiator where the
heater core exit hose would have went. my heater core exit hose first travels to water pump then out
to radiator.
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Old Sep 28, 2021 | 09:31 AM
  #4  
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From: Texas
Car: 1987 5.7 IROC-Z28
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Transmission: Auto
Re: heater core bypass before I start

I suppose i should have added to other threads instead of starting a new one. i'm new. I will get better.
So the hoses in my second pic travel to the factory oil cooler. So I will connect the line coming out of the throttle body
to the line on the left. That should take care of my temporary bypass.
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Old Sep 28, 2021 | 06:50 PM
  #5  
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Re: heater core bypass before I start

The metal pipe on mine connects to the radiator on my 87. That could be another alternative and you just plug the water pump....



What if you plug the water pump and the hose that comes out drom the intake to the TB? no hoses and it'll look cleaner... not sure the size of the intake port though.


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Old Oct 1, 2021 | 01:50 PM
  #6  
87Red5.7IROC's Avatar
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From: Texas
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Re: heater core bypass before I start

Do I need to plug the vacuum line that went to the heater control valve since I have removed it?
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Old Oct 3, 2021 | 01:22 AM
  #7  
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Re: heater core bypass before I start

Originally Posted by 87Red5.7IROC
heater core bypass will connect from throttle body hose in pic 1
To hose on left traveling to water pump in pic 2 correct?

The answer to this question is, yes. The throttle body hose in pic 1 will have to connect to the 90* oil cooler hose in pic 2.

The answer to your last question is also, yes. You'll have to cap the vacuum line for the deleted heater control valve.

Bypassing the heater core and deleting the heater control valve, you'll also be eliminating that metal tube from the heater core to the 90* oil cooler hose. So with the heater core, heater hoses, heater control valve and metal tube out of the equation, then, yes, you'll need a hose that can connect the throttle body(in pic 1) to the 90* oil cooler hose(in pic 2). Coolant will flow from the throttle body to the oil cooler, then to the radiator.

OR... as I think Mr. karr was suggesting, to simplify this further, since you're in Texas, there's no need for coolant to flow through the throttle body at all, so you can eliminate the throttle body hoses by performing the common 'throttle body bypass' mod. Delete the U-shaped hose that connects the front of the intake manifold to the throttle body, then connect a hose to the front of the manifold(where the bottom of the U-shaped hose connected) and run it to the oil cooler hose/tube. Coolant will flow from the front of the intake manifold to the oil cooler, then to the radiator.

OR... you could probably eliminate the oil cooling too and get rid of all hoses and tubes. Remove the hose nipple from the front of the intake manifold(where the bottom of the U-shaped hose connected) and plug the manifold, then remove the oil cooler hoses and tubes, and cap the radiator nipple. Coolant flow will be as simple as radiator-to-water pump and top of intake manifold-to-radiator. No accessory hoses and tubes anywhere.
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Old Oct 6, 2021 | 09:38 AM
  #8  
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From: Texas
Car: 1987 5.7 IROC-Z28
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Transmission: Auto
Re: heater core bypass before I start

Good Info LAFireboyd, thank you. I will probably leave intake and radiator inserts in place. the plan is to eventually replace the
leaking heater core. But.. If I bypass the factory oil cooler do i need to remove it immediately? When it is removed, will the oil filter
then fit to block or will an adapter be needed?
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Old Oct 6, 2021 | 02:52 PM
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Re: heater core bypass before I start

Originally Posted by 87Red5.7IROC
Good Info LAFireboyd, thank you. I will probably leave intake and radiator inserts in place. the plan is to eventually replace the
leaking heater core. But.. If I bypass the factory oil cooler do i need to remove it immediately? When it is removed, will the oil filter
then fit to block or will an adapter be needed?

it's just coolant....coolant goes into the cooler cooling the higher temp oil, or in some cases may acutually heat it up more....

if you disconnect / plug / route correctly as stated above you won;t have any leakage.

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