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Username Post: After Market Heater 54 Pickup        (Topic#348521)
ledzepn 
Forum Newbie
Posts: 40

Loc: Washington
Reg: 03-17-17
12-02-17 10:56 PM - Post#2716694    

I have after market heater on my 54 3100. The fan works but I get no heat. The heater hoses are hooked up to the firewall with nothing
in-between it and the engine. Should I take off the heater hoses and see if there is valve or something? It does not leak. What can I do? The heater was on it when I bought it and I don't what brand it is or how it works. I can't drive it in the winter because of no defroster working.



 
bobschevytrucks.com Ecklers Chevy Trucks
raycow 
Honored Member
Posts: 27567
raycow
Loc: San Francisco, CA
Reg: 11-26-02
12-03-17 12:06 AM - Post#2716697    
    In response to ledzepn

First, disconnect both hoses from the engine and try to blow through either one of them. If you can't blow through, find out where the blockage is. If you can blow through, what engine do you have and where on the engine are the hoses connected?

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
2blu52 
"17th Year" Silver Supporting Member
Posts: 18480
2blu52
Age: 85
Loc: Montana
Reg: 03-12-02
12-03-17 07:30 AM - Post#2716722    
    In response to ledzepn

Air trapped in the system, heater hoses connected incorrectly. If the heater hose connections on the core are vertical then the hot water hose should go to the bottom connection. Make sure the hot water hose is hooked to the proper location on the block.

"PEACE IS THAT GLORIUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"

THOMAS JEFFERSON


 
ledzepn 
Forum Newbie
Posts: 40

Loc: Washington
Reg: 03-17-17
12-04-17 01:19 AM - Post#2716809    
    In response to raycow

Both heater hoses get hot but only a little warm air comes out the vents. The temp gauge reads just before the middle. Could I have the wrong temp thermostat?



 
Mick53 
Platinum Supporting Member
Posts: 166
Mick53
Loc: Northern Indiana
Reg: 04-02-16
12-04-17 08:32 AM - Post#2716828    
    In response to ledzepn

I'm no expert but it could be a flow problem. I would use the blow method. Switch could be clogged up or partially closed. Maybe there is so much gunk inside that you are not getting heat transfer. Also might want to check inside the box and see if a mouse or wasp has made a cozy home around the coil. I would start with a good cleaning of all parts inside and out.



 
raycow 
Honored Member
Posts: 27567
raycow
Loc: San Francisco, CA
Reg: 11-26-02
12-04-17 01:36 PM - Post#2716867    
    In response to ledzepn

If both hoses get hot, this means you are getting flow through the core and your thermostat is ok. Your next move would be to open up the housing as suggested and look for an air flow obstruction.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
bobschevytrucks.com Ecklers Chevy Trucks
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