No Heat after Radiator Replacement with Two Core - Ford Bronco Forum
 10Likes
  • 2 Post By SRWillis
  • 1 Post By miesk5
  • 2 Post By biggum
  • 1 Post By 445 FE Bronco
  • 1 Post By Njbronco74
  • 3 Post By biggum
 
LinkBack Thread Tools Display Modes
post #1 of 14 (permalink) Old 03-05-2017, 06:10 PM Thread Starter
Fullsize Member
 
biggum's Avatar
 
Join Date: Sep 2016
Location: Maine
Posts: 392
Bronco Info: 86 XLT 351 HO, Holley 650, 3" Exhaust, 6L Up, 265/75R16 Dirt Commanders, & 85 302 EFI, AOD, 6L Up
iTrader: (0)
Garage
No Heat after Radiator Replacement with Two Core

85 302 EFI
Replaced single core with double core.
Everything working fine before swap other that radiator leaking.

After swap I have no heat and little if any pressure in system when hot.

Engine not overheating.

I've been burping and filling but only able to add a cup of coolant or so at a time.

I think I still have air in the system or the two core is providing too much cooling.

Ideas? Thanks!


Sent from my iPhone using Tapatalk Pro
biggum is offline  
Sponsored Links
Advertisement
 
post #2 of 14 (permalink) Old 03-05-2017, 07:03 PM
Registered User
 
Join Date: Nov 2015
Location: SW Ohio
Posts: 488
Bronco Info: 1981 Bronco, 4.9L, T18, NP208
iTrader: (0)
It sounds like your thermostat is not opening. I just started mine today after draining my coolant enough to hook up my heater core. I also didn't have heat until I let it run for several minutes, shut it off for a few minutes, then repeating a couple times. I did open the cap and relieve the pressure once, which wasn't much, during the process. The thermostat then opened, I had heat and then was able to add more coolant.
huck2080 and joedirt216 like this.
SRWillis is offline  
post #3 of 14 (permalink) Old 03-05-2017, 07:16 PM
Moderator
 
miesk5's Avatar
 
Join Date: Oct 2003
Location: NJ
Posts: 17,556
Bronco Info: 96 Bronco XL 5.0 E4OD, Man Xfer/Hubs
iTrader: (2)
Garage
Yo Big,
After running engine to normal operating temperature; BEWARE OF FAN, BELTS, PULLEYS, HOT HOSES, IGNITION HIGH TENSION WIRES, AND ENGINE COMPONENTS;
FEEL heater water hoses. If the heater water hoses are too hot to hold, the thermostat is OK. If the heater water hoses do not get too hot to hold, REPLACE the thermostat. If only one heater water hose gets hot while the other remains cool, a plugged heater water hose or heater core is indicated.

Heater water hoses.
CHECK condition and routing of hoses . Visually inspect condition of heater water hoses for pinched or collapsed conditions

CHECK COOLANT FLOW THROUGH HEATER CORE
Start vehicle and allow to reach normal operating temperature.
Place temperature control knob in the full warm position.
Grasp inlet and outlet heater water hoses. Both heater water hoses should be warm to the touch due to coolant flowing through them.

Burp
Fill the radiator with a 50/50 mixture of the specified engine coolant concentrate and water. Allow several minutes for trapped air to escape (bubble out) and for engine coolant to flow through the radiator.
2. Replace the radiator cap to its fully installed position, then back off to the first stop. This will prevent high pressure from building up in the cooling system during this part of the fill procedure.
3. Start and idle the engine until the thermostat opens and the radiator upper hose becomes warm.
4. Shut off the engine and allow the engine to cool. Cover the radiator cap with a thick cloth and cautiously remove it. Step back while the pressure releases.
5. Finally, check the radiator and add more engine coolant if needed, following the procedures noted above. Reinstall the radiator cap securely, when finished.
6. If more engine coolant is necessary, fill the overflow reservoir to the appropriate level marked on the bottle..."
joedirt216 likes this.

See my partially recovered Bronco web site ...Will need to clean up dead links & add many more new links some day. Thanks to Mr. Schwim!
THANKS to ALL WHO SERVE!

Last edited by miesk5; 04-22-2017 at 06:49 PM.
miesk5 is offline  
 
post #4 of 14 (permalink) Old 03-06-2017, 05:35 PM Thread Starter
Fullsize Member
 
biggum's Avatar
 
Join Date: Sep 2016
Location: Maine
Posts: 392
Bronco Info: 86 XLT 351 HO, Holley 650, 3" Exhaust, 6L Up, 265/75R16 Dirt Commanders, & 85 302 EFI, AOD, 6L Up
iTrader: (0)
Garage
Thanks guys. Again, everything worked before the swap so I'm leaning air trapped. However, the single core may have been able to heat even with a stuck open thermostat so I'm going to try a new 195 and see what happens.


Sent from my iPhone using Tapatalk Pro
huck2080 and joedirt216 like this.
biggum is offline  
post #5 of 14 (permalink) Old 03-09-2017, 07:50 AM
Fullsize Member
 
Marty in Md's Avatar
 
Join Date: Jun 2008
Location: Laurel, Md
Posts: 35
Bronco Info: 1993 XLT, 302, 1979 Ranger XLT,351M
iTrader: (0)
Sounds to me thermostat is stuck wide open. Not regulating the water temp.

Marty

Marty in Md is offline  
post #6 of 14 (permalink) Old 03-09-2017, 08:25 AM
Ford Hoarder
 
CrazyBRONCOguy's Avatar
 
Join Date: Apr 2004
Location: Franklin, Indiana
Posts: 5,148
Bronco Info: See Signature
iTrader: (20)
Also agree with the above.
I have replaced a bunch of radiators in these trucks and they seem not prone to getting air stuck in them. I have never had to do anything other then just fill them up, and check the level once its ran a cycle and top off. Not saying that you do not have that problem, only that I have not seen it happen very often.


The Street Queen: '92 Eddie Bauer- C6 Swap, Roller 357W 400hp/400ft-lbs, SCT Tuned, 4" Lift, 4.10's,
Go Fastish Build: '78 Custom- 4" Deaver Lift, Mild 460, Full Cage, 4.10's
Build Thread http://www.fullsizebronco.com/forum/...8-project.html
CrazyBRONCOguy is online now  
post #7 of 14 (permalink) Old 03-09-2017, 09:03 AM
FSM Lifetime
 
445 FE Bronco's Avatar
 
Join Date: Oct 2015
Location: In a foggy zone somewhere
Posts: 6,395
Bronco Info: 1978 Round headlight, 351M,C6, 9", 44/1991, 445 FE, t19, 205, Dana 60/70, MAF, Moet's
iTrader: (0)
Garage
My first inclination is when the radiator was changed a bunch of crud was broken loose and plugged the heater core. In this case I would disconnect the hoses to the heater core after recovering the antifreeze. Use a garden hose fitting on the return side of the core to backflush the core and throughly flush the engine also to remove setement in the water jackets.
joedirt216 likes this.
445 FE Bronco is offline  
post #8 of 14 (permalink) Old 03-09-2017, 04:08 PM
Registered User
 
Njbronco74's Avatar
 
Join Date: Oct 2015
Location: North jersey
Posts: 392
Bronco Info: 1974 bronco sport and 1996 bronco xlt
iTrader: (0)
Garage
I did a three core in mine. When burping mine I let it get up to operating temp and gave the upper rad hose a good squeeze and I could hear quite the burp. Been working great ever since.
joedirt216 likes this.
Njbronco74 is offline  
post #9 of 14 (permalink) Old 03-10-2017, 12:58 AM
Fullsize Member
 
JKossarides's Avatar
 
Join Date: Apr 2005
Location: Rolling Hills Estates, CA
Posts: 9,869
Bronco Info: 1986 Bronco XLT 4x4 -AOD -Warn Hubs, NEW stock 302EFI (2008) All MSD ignition, 9mm FMSR wires
iTrader: (1)
Make sure the "inline and return" line heater hoses are hooked up correctly at the firewall, on my 86 XLT EFI 5.0 the inline goes underneath the FI plenum to a tube which goes into a HEX riser threaded into the intake manifold and the return line goes to the water pump.......just saying!

Thermostat could an issue so get a new one if need be and a "STAT" radiator cap....


Good Luck ~
JKossarides is offline  
post #10 of 14 (permalink) Old 03-10-2017, 03:03 PM
Registered User
 
Join Date: May 2012
Location: DFW, Texas
Posts: 81
iTrader: (0)
I second the votes for thermostat or heater core.

1990 Eddie Bauer Bronco
2004 Harley F250 with some odds and ends
scparrish is offline  
post #11 of 14 (permalink) Old 03-10-2017, 10:19 PM
Registered User
 
Join Date: May 2009
Location: Upstate SC
Posts: 1,449
Bronco Info: 1990 F150, 5.8 w/GT40X heads, Lightning intake, E4OD, 33" tires, detroit locker rear & true trac fro
iTrader: (5)
My heater core was stopped up. I had no real heat. I replaced the heater core (a very easy job in these vehicles by the way) and voila, great heat again.

hth
tim
TS 90F150 is offline  
post #12 of 14 (permalink) Old 03-14-2017, 12:44 PM
Fullsize Member
 
joedirt216's Avatar
 
Join Date: Jan 2014
Location: Montana
Posts: 87
Bronco Info: 1990 Full Size Eddie Bauer 302ci Auto
iTrader: (0)
So, biggum, did you get the Bronco throwing heat again?? And what was the cause?
joedirt216 is offline  
post #13 of 14 (permalink) Old 03-15-2017, 01:36 AM
Fullsize Member
 
Join Date: Jun 2010
Location: Collin county, TX
Posts: 3,718
Bronco Info: Brick Nose on 15x10s/32s with leveling coils
iTrader: (2)
It's not the radiator either heater core or tstat or both. FYI get a premium stant t-stat off rockauto (better than mc imo). that or a motorcraft. The cheap ones are like a paperclip. junk.
GetBent4x4 is offline  
post #14 of 14 (permalink) Old 03-20-2017, 05:47 PM Thread Starter
Fullsize Member
 
biggum's Avatar
 
Join Date: Sep 2016
Location: Maine
Posts: 392
Bronco Info: 86 XLT 351 HO, Holley 650, 3" Exhaust, 6L Up, 265/75R16 Dirt Commanders, & 85 302 EFI, AOD, 6L Up
iTrader: (0)
Garage
The thermostat was in fact stuck open. With the single core radiator it still ran hot enough to generate heat in the cab but with the two it could not. Put in a new stant therm and it's doing great. Thanks for the help folks.


Sent from my iPhone using Tapatalk Pro
joedirt216, dash_cam and SkyMaster like this.
biggum is offline  
Reply

  Ford Bronco Forum > Bronco Discussions > 1980-'96 Bronco Tech

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Bronco Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself. DO NOT USE Gmail.com accounts. If you only have a Gmail.com email please contact the administrator here

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome