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  #16 (permalink)  
Old 02-23-2019, 12:00 PM
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1937 Ford Pickup
 
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I think I will put a 210 thermo in for the electric fan. My main fan is a flex fan. When this can't handle the heat I want the electric to kick in.

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Old 02-23-2019, 10:45 PM
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Pull the heater lines from your block and just run a garden hose into them. The water should flow through the hose, core, and out the other hose. If not your core is blocked.

Start up your engine and get it 180-200 where ever your thermostat opens. Try to squeeze the upper hose. You should not be able to squeeze it or if you can very little. If you can flatten it by squeezing your not building pressure. You have a leak somewhere or the radiator cap is not sealing properly. If your not loosing coolant then the cap is probably bad. If the upper hose is cold when the engine is hot then you are missing a thermostat or it is stuck closed or you have a bad sending unit.

These are the cheap and easy things to check to start with.
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  #18 (permalink)  
Old 03-07-2019, 03:50 PM
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Well I moved the hoses to the correct positions and still no heat. I'm still thinking I need an auxiliary water pump. Help Please
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Old 03-07-2019, 04:29 PM
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https://www.flex-a-lite.com/pdf_inst...63%2099858.pdf

Click on above for installation instructions for your heater unit. It says it has a manual shut off valve. Is your Valve in the open Position??
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Old 03-07-2019, 04:30 PM
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What are the incoming and outgoing heater hose temps?
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Old 03-08-2019, 09:15 AM
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Yes there is an on off valve. It is open.
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Old 03-08-2019, 09:18 AM
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I guess I will try the garden hose next.
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Old 03-08-2019, 11:36 AM
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Most times the heater connections are blocked with plugs for shipping. Are they still there with the heater hoses slipped on over them? You could disconnect the heater hoses and blow thru with compressed air, shop vac, or even your mouth. Something is blocking flow. Is your system new with the shipping plugs or old and plugged with whatever? In a '37 pick up, that heater should roast you in the cab.

Last edited by '48 Austin; 03-08-2019 at 11:53 AM.
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Old 03-09-2019, 04:48 PM
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When I installed the heater I pulled both plugs out of the heater. When I get some time I will run water through the hoses to see if I get a flow out.
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Old 03-16-2019, 09:23 AM
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I removed the heater hoses and ran water through with a garden hose with no problem. Still no heat.
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Old 03-16-2019, 11:13 AM
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Is the heater fan blowing air through the heater core or is there a door not operating properly and the air is directed around the heater core?? The heater core could be air bound. Remove the heater hose from the intake manifold, lift up high and fill completely with coolant while a buddy holds their thumb on the nipple at the intake manifold. Reconnect heater hose, check coolant level and try it out. Also post some pictures showing where the heater hoses connect to the engine.

Last edited by '48 Austin; 03-16-2019 at 11:22 AM.
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  #27 (permalink)  
Old 03-16-2019, 08:04 PM
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Are you using a vacuum operated heater valve? If so make sure it operates properly. Some valves are open when vac is applied and some are closed with vacuum. I've seen more than once the wrong valve ending up for the wrong application.

BB
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  #28 (permalink)  
Old 03-17-2019, 10:43 AM
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Using a manual valve and it is open and clear. The heater hoses have a long run from the engine to the heater. The heater is installed under the seat.
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Old 03-17-2019, 10:59 AM
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Post some pictures showing where the heater hoses connect to the engine.
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  #30 (permalink)  
Old 03-17-2019, 11:43 AM
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Quote:
Originally Posted by Ralfareno View Post
Using a manual valve and it is open and clear. The heater hoses have a long run from the engine to the heater. The heater is installed under the seat.
That in itself isn't a problem. Auto manufactures did that for years. My 55 Buick had a underseat heater for the back seat. That configuration works just fine Think about all the Van's with split systems. Same thing. I just looked a a picture of your unit. let me ask you a question. Do you have good air flow from the front of the unit when its on? This unit should blow air like a Banshee.

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heater, no coolant circulation, no heat

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