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Username Post: 77 C20 Engine Cooling        (Topic#358012)
corvesy 
"4th Year" Gold Supporting Member
Posts: 687
corvesy
Reg: 08-07-08
09-10-19 02:59 PM - Post#2775275    

Man its hot in Middle Tennessee today. 101 degrees.
I recently put a Vintage Air kit on my C20 and its doing a good job. In addition I removed my mechanical fan and replaced it with a Jeep Liberty electric fan (a hack I saw on line). The problem is I need more fan (more cfm) I think. Today I needed to run some errands around town and the temperature gauge started to climb slowly above mid gauge to the next mark on the gauge I guess to 210 degrees.
I checked the skin temperature with my infrared gauge and it read 212 degrees. I believe if I continued to run the truck with the a/c on it would climb to hot on the gauge. My question is has anybody installed a good performing engine cooling fan probably somewhere in the 4000 cfm range. I know there are so hacks out there using Lincoln dual fans and others but I don't want to do another hack that doesn't perform. Comments welcome. The truck has a new parts store aluminum radiator, new water pump and thermostat.



 
gchemist 
Senior Chevytalk Moderator
Posts: 24894
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-11-19 04:02 AM - Post#2775315    
    In response to corvesy

crovesy,
What is your thermostat setting? If you have an all iron block and head combo, you can drop in a 180 thermostat.

Follow my post here regarding A/C and cooling: https://www.chevytalk.org/fusionbb/showtopic.php?t...

We live in areas where we need A/C cooling before engine cooling. I've closed the gap between the radiator and condenser. GM started that feature with 88+ trucks. Close the gap with hot water insulation. A/C cooling improved.

What kind of relay/control set up is installed? I'm fixing to add a third separate auxiliary fan. GM mounted them on the right side. I have to mount mine on the left. A huge transmission cooler is on the right. I run a dual LS Camaro fan setup. https://www.chevytalk.org/fusionbb/showtopic.php?t...

Another great option is to bypass the heater core. I'm doing it to mine. Follow this post: https://www.chevytalk.org/fusionbb/showtopic.php?t...

Does the Vintage Air set up combine the heater core too?

I'm fixing to add a Mark VIII fan to our 2000 Ram. It will run with a BMW two temp probe. The Mark VIII fan is two speed. A trinary switch ported added to the hoses will control A/C fan cooling. The two speed fan will use a Volvo two speed relay setup for cooling.

Follow these links for detailed big fan conversions.
Volve turbo fan info: https://www.240turbo.com/ElectricCoolingFans.html

Mark VIII or LS dual fan conversion: http://tbichips.com/?page_id=46

Mark VIII info: https://www.fordmuscle.com/archives/2006/10/Mark 8F...

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


Edited by gchemist on 09-11-19 02:14 PM. Reason for edit: No reason given.

 
Liberty Valance 
Contributor
Posts: 115
Liberty Valance
Loc: Euless,Texas
Reg: 07-21-14
09-11-19 03:40 PM - Post#2775353    
    In response to gchemist

What type of material is the hot water insulation?
Is it a thin rubber like material? Thickness/ Width?

1974 Cheyenne 10 LWB 350/TH350/AC/4 BBL Quadrajet


Edited by Liberty Valance on 09-11-19 03:41 PM. Reason for edit: No reason given.

 
gchemist 
Senior Chevytalk Moderator
Posts: 24894
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-11-19 06:55 PM - Post#2775363    
    In response to Liberty Valance

It’s basic hot water insulation from a hardware store. Bought a 6’ piece and cut to length. It’s a rubber/foam lined with plastic to hold shape. Even thick bendable plastic will work. All newer trucks have plastic gap covers.

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


 
corvesy 
"4th Year" Gold Supporting Member
Posts: 687
corvesy
Reg: 08-07-08
09-12-19 06:20 AM - Post#2775381    
    In response to gchemist

Thanks for the reply gchemist. I like the idea of making air guides(gap reduction) and will try that first. What was your results when you added the air guides on your truck?



 
gchemist 
Senior Chevytalk Moderator
Posts: 24894
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-12-19 06:37 AM - Post#2775382    
    In response to corvesy

With high temps here, the A/C trinary switch turns on the electric fans before engine running temperatures. Since closing the gap, cold air is felt blowing through the cab faster. Once the truck is moving, it gets colder faster. I decided to use hot water pipe foam since it will form to seal radiator and condenser edges. I need add more. The 454 top radiator bracket has a pocket on both sides. I should have trimmed foam longer to seal from top to bottom.

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


 
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