Where do I look? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 15 (permalink) Old 02-08-2018, 03:03 PM Thread Starter
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Question Where do I look?

Hey everyone! Would someone be able to point me in the direction of a post that deals with the heating system? I have tepid air for heat & if I'm driving in the rain & turn my defroster on, water leaks into the car on from underneath the passenger's side of the dash! 66 galaxie 500 4 door, 289/ COM. Thank you in advance!
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post #2 of 15 (permalink) Old 02-08-2018, 05:14 PM
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Re: Where do I look?

Water or coolant? If you need a new heater core, I got mine here.

https://www.dearbornclassics.com/hea...965-1967.html#

Good luck!!



1966 Ford Galaxie convertible.
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post #3 of 15 (permalink) Old 02-08-2018, 05:57 PM
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Re: Where do I look?

For the water leak, get the hose and water the roof and windshield molding. Then go inside and see if there is a trail of water coming down on the inside of the glass. If so, the water is getting in up there in the molding and that path runs down to the carpet.

Re the heater situation, are both hoses to the heater core hot? Do you have factory A/C? Does the fan work?

Putts drives a 1965 customized Galaxie. Rebuilt 390, 4100 electric choke on a Performer, MX, AC, PS, PB w Scarebird front discs on Cragar 17" S/S.
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post #4 of 15 (permalink) Old 02-09-2018, 09:01 AM
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Re: Where do I look?

Quote:
Originally Posted by alberatzi View Post
Hey everyone! Would someone be able to point me in the direction of a post that deals with the heating system? I have tepid air for heat & if I'm driving in the rain & turn my defroster on, water leaks into the car on from underneath the passenger's side of the dash! 66 galaxie 500 4 door, 289/ COM. Thank you in advance!
The heater core is behind the glove box. Engine coolant should be circulating through it all the time, so if the leak only shows up when out in the rain, then the leak may not be the heater core. Do you have lots of air blowing out the defrost vents? If you have lots of air and no heat, then the core is suspect, but if you have little air, but it is hot air, then the damper doors and controls are suspect. This all depends on the blower motor spinning the fan as it should. The fresh air comes from the cowl area, so if that area is not draining well water could flood the ventilation air intake and get into the airbox and end up on the floor on the passenger side.

1970 XL, 351W originally 2V, now 4V
670 Street Avenger, Edlebrock Performer intake, Comp XE262H, Flowtech Headers
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post #5 of 15 (permalink) Old 02-09-2018, 01:10 PM Thread Starter
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Re: Where do I look?

The last time I checked, yes, both the heater core hoses were hot. But I need to check them again because it's been quite some time. Factory A/C (though not in the car @ the moment) & the fan works.
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post #6 of 15 (permalink) Old 02-09-2018, 01:13 PM Thread Starter
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Re: Where do I look?

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Originally Posted by puttster View Post
For the water leak, get the hose and water the roof and windshield molding. Then go inside and see if there is a trail of water coming down on the inside of the glass. If so, the water is getting in up there in the molding and that path runs down to the carpet.

Re the heater situation, are both hoses to the heater core hot? Do you have factory A/C? Does the fan work?
I've never seen a trail of water on the inside of the windshield, but with her being 52 & not sure if the windshield has ever been replaced.....
BTW- are Galaxies supposed to have 2 panes of windshield glass? I noticed this several months after I bought her....
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post #7 of 15 (permalink) Old 02-09-2018, 01:17 PM Thread Starter
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Re: Where do I look?

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The heater core is behind the glove box. Engine coolant should be circulating through it all the time, so if the leak only shows up when out in the rain, then the leak may not be the heater core. Do you have lots of air blowing out the defrost vents? If you have lots of air and no heat, then the core is suspect, but if you have little air, but it is hot air, then the damper doors and controls are suspect. This all depends on the blower motor spinning the fan as it should. The fresh air comes from the cowl area, so if that area is not draining well water could flood the ventilation air intake and get into the airbox and end up on the floor on the passenger side.
The heat that comes out of the vents is lukewarm at best. The heater core was new when I rebuilt the engine, along with the hoses, the radiator, water pump, thermostat, etc. I'm wondering if one of the vacuum motors went bad or there is some dry rotted vacuum tube somewhere underneath the dash.
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post #8 of 15 (permalink) Old 02-09-2018, 06:03 PM
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Re: Where do I look?

If the heater core is leaking, and assuming that you use a 50-50 antifreeze mix, the smell of the "water" should be very recognizable. Aslo, since the coolant is hot, the inside of the car should be steamed up pretty bad.

If you aren't using an antifreeze mix, then the core would rot away in just a few years. Or clog up so you get little or no heat.

You should have a heater valve on the hose from the engine water pump to the core. If it is cable operated you can simply turn the controller to heat and that should operate the valve- easy to check.

On AC cars with vacuum systems, you can use a vacuum meter on the hose to the valve and test the system operation that way. You should get manifold vacuum when you set the controller to heat, and zero when set to cold. If no or low vacuum, you could have rotted hoses, a hole in the accumulator (looks like a coffee can), or something is disconnected. Lots of stuff accessories operated by vacuum back in the day: heat-AC controls, door locks, vents, brake release; lots of places to look n highly optioned cars. Use a vacuum pump to bypass the controller to test the valve.

All windshields since the mid 30's use laminated glass: two panes with a sheet of plastic between.

1964 Thunderbird 390 V8, AOD, F.A.S.T. EZ EFI 1.0, Victor intake, MSD Ignition.
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post #9 of 15 (permalink) Old 02-09-2018, 07:38 PM
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Re: Where do I look?

Hello alberatzi,

Not sure about your water leak, but insofar as your tepid heat, here's a snippet of what I posted on heater fixes for '65-'68 gals with factory air con systems as they are totally different than non-factory air con heaters.

https://www.fordmuscleforums.com/gala...post1629532450

Good Luck!
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post #10 of 15 (permalink) Old 02-09-2018, 08:46 PM Thread Starter
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Re: Where do I look?

Thanks a bunch Desert XL- I think the link you provided will be of great benefit!
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post #11 of 15 (permalink) Old 02-11-2018, 04:34 PM
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Re: Where do I look?

I love that pic! With apologies to Desert here it is again, with some rookie notes.
Desert is a perfectionist, but for us less committed souls ... when winter approached Junkyard would wire the lever to the heater door open; you can bypass the switch # (2) or, if you have no vacuum, bypass the water control valve, etc. and then change back again in the summer.
The dashboard vacuum switch has the black hose coming in one side, supplying the vacuum and it is channeled to three hoses (red, white, blue) depending where you move the lower lever. You can check the vacuum coming from the canister several ways, like by cutting the black hose and putting your thumb over the opening and the red and white hoses by getting underneath the passenger dash and observing while you move the lower lever.
By now those vacuum motors are probably shot, though and they can be pretty challenging to find replacements.
Finally, if you have hot water in the core hoses, the fan is blowing air and it is not hot, IMO you have a bad core.
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Putts drives a 1965 customized Galaxie. Rebuilt 390, 4100 electric choke on a Performer, MX, AC, PS, PB w Scarebird front discs on Cragar 17" S/S.

Last edited by puttster; 02-12-2018 at 09:53 PM.
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post #12 of 15 (permalink) Old 02-12-2018, 05:58 AM
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New heater core? If it is from a local part store it is too small and the air will blow around it. You can get some heat back by filling the gap with material. Also, when I replaced mine the ears on the fiber box that contains the air were so fragile two broke. I rebuilt them with fiberglass to get it tight but not everybody would.

Putts drives a 1965 customized Galaxie. Rebuilt 390, 4100 electric choke on a Performer, MX, AC, PS, PB w Scarebird front discs on Cragar 17" S/S.
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post #13 of 15 (permalink) Old 02-12-2018, 01:39 PM
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Re: Where do I look?

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Originally Posted by alberatzi View Post
The heat that comes out of the vents is lukewarm at best. The heater core was new when I rebuilt the engine, along with the hoses, the radiator, water pump, thermostat, etc. I'm wondering if one of the vacuum motors went bad or there is some dry rotted vacuum tube somewhere underneath the dash.
It would seem like you have coolant flow through the heater core, so that would seem to make the blend doors, and their sealing suspect. When you have it set on "Heat", so the air is directed out onto the floor, do you get lots of hot air there? No matter what, it sounds like you're going have to get into the air box to see what is going on.

1970 XL, 351W originally 2V, now 4V
670 Street Avenger, Edlebrock Performer intake, Comp XE262H, Flowtech Headers
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post #14 of 15 (permalink) Old 02-12-2018, 07:40 PM
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Re: Where do I look?

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Thanks a bunch Desert XL- I think the link you provided will be of great benefit!
Hello again,

Just to reiterate, the 3rd gen galaxie factory air con has no blend door. Which weirdly the 3rd gen non factory air con heater does. As a result the only way the heater (heat) output is controlled is by regulating the flow of coolant through the heater core. So just because it may seem like there is coolant flowing, doesn't mean it's enough.

Here's two simple diagnostic tips that do not involve taking anything apart and only takes a few moments. First, the only vacuum driven air selector door in the dash that could cause little heat (bypassing heater core) is the recirc door (aka Max A/C).

Here's a simple test. Start the car and put it in heat and warm and blower on high. If that door is open or partially open the blower motor/wheel will seem really loud as if you look under the passenger side dash if it's open or partially open you should be able to see directly into the squirrel cage blower wheel. In heat mode this should be closed all the way. Another quick test, with engine running, slide the temp selector from heat to max a/c, the blower should get louder. Then back to heat, should be quieter. Repeat a few times to make sure noise levels are repeatable (door not sticking) if it's too hard to look at the door from the under passenger dash. This door is designed to be either fully closed or fully open. Anything in between is a failure (check vacuum lines, door hinge, seal and vacuum source).

The last simple test is checking if there is enough coolant flow through the heater core. Start the car, let it reach full operating temperature, then put it in heat, all the way hot and blower on high speed. Let it run like this for a minute or two. Next open the bonnet and feel the heater hoses leading to the hidden heater core. They should both be hot, if one of them is warm and the other hot, there is not enough coolant flow.

If this is the case, put a vacuum gauge on the hose at the heater control valve at this point, it should be at least 15 inches of vacuum at idle. If not, go through the vacuum lines. If there is at least 15 inches of vacuum then it's either the heater control valve, heater core, plugged hoses or fittings in the engine (have seen this believe it or not).

With these two quick diagnostics it will give you a good place to start without starting at one end of the system and working your way through the entire HVAC. Although with a 50+ year old car I would highly recommend it if you wish it to be reliable.

Good luck

Cheers

p.s. Thank you puttster for adding the notes to my picture, glad you like the photo.
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Last edited by DesertXL; 02-12-2018 at 07:45 PM.
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post #15 of 15 (permalink) Old 02-13-2018, 08:08 AM Thread Starter
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Re: Where do I look?

Thank you so much for this info! Anytime I can diagnose without disassembly is a blessing! I'll run these tests & let you know the results.
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