Cool/Heat: 61 Hawk; warm air with heater/cold air with defroster

[61Hawk4sp]

61 Hawk. Heater blows hot air on both speeds, defroster blows cold air on both speeds. Any help?

[bezhawk]

Is the defroster even hooked up?
It is entirely separate from the heater unit. It gets it's hot water from a tee in the heater hoses. (supply side after the valve).
Look for connections at the fire wall. The motor sticking out near the right cylinder head if for the defroster, and the hoses should be just below that.
The main heater motor is hidden behind the right fender and is separate.

[SN-60]

Defroster heater core is seperate assembly. It could be blocked, as could hoses leading to and from it. Try removing hoses and forcing moderate pressure water through it. Good luck

[JoeHall]

Even when working perfectly, it is always going to blow lukewarm air, at best. Its a marginal design that circulates very little hot water thru the coil. However, the 'T' fittings are prone to partial stop-up with crud. So it may help to disconnect the hoses at the 'T' fittings and inspect. While the hoses are off, blow thru them to make sure the coil isn't stopped up.

[rockne10]

In addition, while the air for the heater is supplied by the air rammed in at the fender vents, there is no rammed air passing through the defroster core. It will only reach maximum force when its fan is circulating cabin air already supplied by the heater.

As advised, make certain the defroster core is getting its maximum flow of coolant and all air duct hoses are in place.
And...don't drive through Manitoba in January!

[2moredoors]

The diameter of the tee hole to the defroster is quite small and could quite easily be blocked. SI and other vendors sell a plastic tee now, the originals were metal.

[Carl Purdy]

Back many many years ago when I drove my 51 as a work car I made 2 Y fitting and put them in place of the T fitting and got a lot hotter air thru the defrosters.

[JoeHall]

The diameter of the tee hole to the defroster is quite small and could quite easily be blocked. SI and other vendors sell a plastic tee now, the originals were metal.

I hate to ruin perspective sales for vendors, but LOWES sells brass 'T' fittings for house trailer plumbing that works great, and has a slightly bigger inner diameter hole for the 3/8" fitting that goes to the defroster. The outside is also a tad larger, but still will accept the 3/8" hose. Another tip, left by my old friend Lester Schmidt, and now passed on by me And by the way, Les was also a plumber back in the day!

[RadioRoy]

I wish I had known that many years ago. I made my own from copper tubing and a soldering torch. They worked great and I had the satisfaction of making them myself, but still not as easy as buying them.

[2moredoors]

I hate to ruin perspective sales for vendors, but LOWES sells brass 'T' fittings for house trailer plumbing that works great, and has a slightly bigger inner diameter hole for the 3/8" fitting that goes to the defroster. The outside is also a tad larger, but still will accept the 3/8" hose. Another tip, left by my old friend Lester Schmidt, and now passed on by me And by the way, Les was also a plumber back in the day!

I have also seen tees like you describe in plumbing departments but I had already replaced mine through SI.