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Old 08-07-2020, 10:10 AM   #1
The Rocknrod
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Vortec Coolant Bypass

I'm using the following heater valve on my two hoses that run from and to the heater/engine - https://www.oldairproducts.com/produ...ve-kit-50-1555
Say's "Special design diverts coolant directly to the engine, away from heater core, when in the off position to reduce excess heat inside the vehicle"
In my minds eye that would mean I shouldn't need a bypass hose on my Vortec head style engine? What do you think?
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Old 08-07-2020, 10:45 AM   #2
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Re: Vortec Coolant Bypass

Not sure on the bypass, I don't run one. Over 60,000 miles with out an issue.
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Old 08-07-2020, 11:00 AM   #3
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Re: Vortec Coolant Bypass

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Originally Posted by PGSigns View Post
Not sure on the bypass, I don't run one. Over 60,000 miles with out an issue.
Jimmy
Anything special on your thermostat? Holes or type?
Ya, I'll probably be okay.

Last edited by The Rocknrod; 08-07-2020 at 11:12 AM.
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Old 08-07-2020, 01:18 PM   #4
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Re: Vortec Coolant Bypass

Not sure on the vortec but I'm using one on my LS....which I've been told needs the bypass
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Old 08-07-2020, 03:49 PM   #5
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Re: Vortec Coolant Bypass

my new gm L31 i installed was burping and girggling until i did the little bypass hose from the water pump to intake like a BBC engine has from the factory .

i read a lot and asked a lot on this and it seems 50/50 mix of problems or no problems so try it and you will know . mine would pass gas in to the overflow bottle and then when the blower fan was on you would smell coolant like a bad heater core leaking . also if the vehicle is quiet i was hearing the rad cap letting it past .
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Old 08-08-2020, 01:34 AM   #6
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Re: Vortec Coolant Bypass

Vortec block or no? I am told the some of the blocks have the bypass in them, in turn which does not require the bypass from back of intake manifold.

This is a roller motor no doubt.

Here is a pic
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Old 08-08-2020, 01:37 AM   #7
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Re: Vortec Coolant Bypass

I do like what your thinking. Making it comfortable in the Summer. I know that stupid little heater core will take 10-15 degrees off the engine in summer.
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Old 08-08-2020, 10:32 AM   #8
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Re: Vortec Coolant Bypass

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Originally Posted by toolboxchev View Post
Vortec block or no? I am told the some of the blocks have the bypass in them, in turn which does not require the bypass from back of intake manifold.

This is a roller motor no doubt.

Here is a pic
not the back of the intake . its the front of the intake . the back pass side was just the heater core feed in later years to simplify stuff.
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Old 08-08-2020, 11:12 AM   #9
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Re: Vortec Coolant Bypass

I believe it's the vortec heads that don't have the bypass not the block. Could be wrong.
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Old 08-09-2020, 10:24 PM   #10
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Re: Vortec Coolant Bypass

That is correct. Every '95-'02 block I have had, still has the bypass passage as in the pic in toolboxchev's post. It is the Vortec heads that do not have the matching hole drilled in the deck surface. This can be easily drilled when building an engine.

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I believe it's the vortec heads that don't have the bypass not the block. Could be wrong.
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Old 08-09-2020, 11:18 PM   #11
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Re: Vortec Coolant Bypass

I will have to look and drill my two sets of vortec heads if they dont have this hole

In the slow process of pulling one now with my broken leg takes me longer to do these days
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Old 08-10-2020, 09:53 PM   #12
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Re: Vortec Coolant Bypass

None of the Vortec heads have that hole drilled in them. That is why the L30 and L31 use an external bypass.
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Old 08-11-2020, 03:10 AM   #13
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Re: Vortec Coolant Bypass

The one thing i should ask do you need to drill out front and back of both heads ?
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Old 08-11-2020, 03:15 PM   #14
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Re: Vortec Coolant Bypass

It's a lot easier to add a bypass than it is to drill heads.
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Old 08-11-2020, 06:41 PM   #15
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Re: Vortec Coolant Bypass

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Originally Posted by garyd1961 View Post
It's a lot easier to add a bypass than it is to drill heads.
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Old 08-11-2020, 09:45 PM   #16
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Re: Vortec Coolant Bypass

The bypass is only on the passenger side at the front. If your engine is already together, no need to pull the head. Just plumb in an external bypass as sweeetK30 did.

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The one thing i should ask do you need to drill out front and back of both heads ?
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Old 08-11-2020, 10:06 PM   #17
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Re: Vortec Coolant Bypass

Here's mine. The hose is Gates #12044, cut to fit.
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Old 09-04-2020, 12:14 AM   #18
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Re: Vortec Coolant Bypass

I see what you mean easier to do the bypass then drill the heads
I did not realize you had to drill the passages in the heads at an angle
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