Thread: Need help with coolant lines.

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I converted from reverse flow to old school reg coolant flow and I have NO warm air blowing through vents and the truck is NOT running hot 180-190 temp.

Things I checked:
1. Wiring. Made sure all flapper doors are working.
2. Leaks. Found none.
3. Correct coolant level.
4. Flushed lines and all old coolant before installing new motor.

I can hear the flapper door moving when I change the setting on the dash but still no warm air.

As you look @ the heater hose fitting from the front of the truck, the left hose is going to the rad fitting(same as stock) and the right hose is going to fitting on water pump(used to be on rear of intake manifold).
Am I doing something wrong? I have been working on this for 2 days. Any ideas???

Air lock in heater ???

Originally Posted by roadster32

Air lock in heater ???

that would be my guess , take off one end of hose and run engine when water comes thrugh put hose back on.... probably better to have help with this.

It's going to be process of elimination. Start right at the block and see if water is coming out of one of the two hoses. Generally, the 5/8 hose is the water to the heater and the 1/2 hose is the return (keeps the water in the heater longer) If you have flow out of there, then take the hose off at the heater and see if it is coming through. Some have a shut off valve in line, make sure water goes through that. Water usually goes in the bottom of the heater core and comes out the top, but not always.

If you have water going into the heater, then make sure it is coming out, could be a plugged up heater core. Then simply make sure you have the correct port for water to reenter the block. If you have it hooked up where it is pressurized it will not make the circuit. There is no magic to this system, it just siphons regular coolant off of the engine and diverts it through the heater core. Very simple arrangement.

Don

Hey chaps, tough up... hotrods don't HAVE HEATERS!!!!! Okay I'm being cheeky and abit of a smart #ss.. Is there water in the system???? Okay I will stop now...

Originally Posted by Whiplash23T

Hey chaps, tough up... hotrods don't HAVE HEATERS!!!!! Okay I'm being cheeky and abit of a smart #ss.. Is there water in the system???? Okay I will stop now...

At least you didn't suggest he waits to drive the car until Summer.

Don

Are both hoses warm/hot to the touch?

Originally Posted by Oldmanb

Are both hoses warm/hot to the touch?

Matter of fact.........No not really. The one from heater core to rad is hot but the hose from water pump to heater core is not. And they dont seem to build any presure.

Hmmm.

must both be on same side of pump

Originally Posted by JBoss

I converted from reverse flow to old school reg coolant flow and I have NO warm air blowing through vents :

what do you mean by converting .. did you change water pumps ? or direction of belts

Originally Posted by HOSS429

what do you mean by converting .. did you change water pumps ? or direction of belts

HOSS,
I changed from a counter clockwise water pump system to a clockwise water pump, like the older small blocks's used.

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I'm fairly sure I have to swap the hoses. I'll find out as soon as I get back from Fla.

Originally Posted by cffisher

must both be on same side of pump

They are. The water pump, or the radiator are both on the same side. You will have to hook one hose the the crossover near the thermostat.