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Username Post: coolant shutoff OR bypass        (Topic#357164)
aero_nautical 
Contributor
Posts: 141

Loc: Arkansas
Reg: 09-12-10
07-09-19 02:37 PM - Post#2770306    

1993 Suburban K1500

I want to get a little better Air Conditioning performance out of my rig and I have heard of people putting a shutoff valve on the heater hose that comes off the intake manifold to then connects to the inlet of the heater core.

My question is: Will it starve some other place coolant that needs it?

I was wondering if I should devise some method of bypassing the heater core that I can switch on and off or just install a shutoff.



 
1983G20Van 
Super Senior Member
Posts: 3767

Loc: Bedford, Texas, USA
Reg: 11-13-02
07-09-19 08:53 PM - Post#2770342    
    In response to aero_nautical

Just install the ball valve and shut it down. I have had a manual valve on almost every one of my domestic vehicles over the last 15 years. TBI G20 van, my Vortec Express van, my 4.7 Dakota, and my 5.7 Ram... My import stuff Nissan and Infiniti came factory with an electrically operated valve.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
bowtie44s 
Valued Contributor
Posts: 4236
bowtie44s
Age: 36
Loc: wv
Reg: 08-29-12
07-09-19 10:38 PM - Post#2770347    
    In response to aero_nautical

As 1983G20Van said, it won't hurt a thing to shut it off. I bought an Edelbrock Permormer RPM. The hole wasn't even in the intake. I had to drill and tap it so I could have a heater.

If Edelbrock blocks that port, it must not be necessary. I put a ball valve in the hose and it lowers my vent temps about 4° when it's shut off. It doesn't change the coolant temp a bit with it open or closed.

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2733
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
07-10-19 07:47 PM - Post#2770419    
    In response to bowtie44s

My toyota has a valve, the ac blows so cold, and the heat works great. They should all have a valve.
Should not hurt anything

Old School GM fan FOREVER


 
tcndeb 
Senior Member
Posts: 418

Loc: Texas
Reg: 04-18-04
07-11-19 07:28 PM - Post#2770499    
    In response to aero_nautical

I have a ball valve on my 92 Blazer. I can get about 5 degrees cooler with the valve closed. The only downside is that your A/C will run on max cold. If it gets too cold, which mine does in the mornings, turning the temp control up does nothing because you have no warm air to mix in.

'92 Full Size Blazer


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2733
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
07-11-19 07:39 PM - Post#2770501    
    In response to tcndeb

Can probably run a cable through into the cab to control it.

Old School GM fan FOREVER


 
aero_nautical 
Contributor
Posts: 141

Loc: Arkansas
Reg: 09-12-10
07-14-19 07:11 AM - Post#2770659    
    In response to rockfangd

Excellent, excellent news fellas! Thanks so much. Love you guys on this forum!



 
rain_man_rich 
Contributor
Posts: 146

Loc: Grants Pass, OR
Reg: 02-09-14
07-14-19 01:43 PM - Post#2770689    
    In response to aero_nautical

If you wanted to get real cute you could go with something like this and connect it to the power for the A/C switch. I don't see it being a big power draw so it wouldn't need it's own relay or anything. It does have a max operating temperature of 180 degrees so it would be working right at or slightly above it's temp limit.

https://www.adafruit.com/product/996?gclid=Cj0 KCQj...





Edited by rain_man_rich on 07-14-19 09:39 PM. Reason for edit: No reason given.

 
gchemist 
Senior Chevytalk Moderator
Posts: 24894
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
07-16-19 07:57 AM - Post#2770833    
    In response to rain_man_rich

Look at a FOUR SEASONS 74781 valve. It's vacuum operated. When the engine/vac is off, water can flow through the heater core. Heat will dissipate faster. On my truck, I plan to tie it off (bypass the heater core) until winter.

For winter, an variable flow option is good: HVAC Heater Control Valve-Shut-off Valve 4 Seasons 84706

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


Edited by gchemist on 07-16-19 08:05 AM. Reason for edit: No reason given.

 
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