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Username Post: 54 3100 defroster        (Topic#349000)
ledzepn 
Forum Newbie
Posts: 40

Loc: Washington
Reg: 03-17-17
01-03-18 08:04 PM - Post#2719930    

Why is it that when I turn on the defroster, my windshield frost up badly for a long time? I have to keep wiping the windshield off with a towel. I do better not even using the defroster at all.



 
bobschevytrucks.com Ecklers Chevy Trucks
raycow 
Honored Member
Posts: 27492
raycow
Loc: San Francisco, CA
Reg: 11-26-02
01-04-18 02:18 AM - Post#2719945    
    In response to ledzepn

Possible heater core leak. Do you smell antifreeze inside the cab or are you noticing any coolant loss?

Ray

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


 
ledzepn 
Forum Newbie
Posts: 40

Loc: Washington
Reg: 03-17-17
01-04-18 12:57 PM - Post#2719997    
    In response to raycow

No leaks that I can see or smell.



 
Mick53 
Platinum Supporting Member
Posts: 165
Mick53
Loc: Northern Indiana
Reg: 04-02-16
01-05-18 07:43 AM - Post#2720087    
    In response to ledzepn

Have you tried not breathing or cracking a window?



 
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 4233
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
01-09-18 07:33 PM - Post#2720618    
    In response to Mick53

Hi Ledzepen, because its an old cast iron engine that takes at least 5 minutes to get warm enough to heat the coolant up to anything like a useful temperature to effect the internal condensation by way of the defroster.

Also if your thermostat has failed open then this will take longer still. Also your heater core could be a bit clogged up and may not be working effectively. I have come across them being blocked solid in a different car.

You can often clear them in place by using a low pressure garden hose to flush them. But whatever you do do not use air pressure. The core will burst.

I just gently run the garden hose in each disconnected end of the heater hoses at the front of the car. Do this on the lawn not the drive. Patience is the byword here. As the original core is for about a 4-6 Psi system if you want to run more pressure in the radiator then you need to upgrade the heater core to match.

The other issue is that the heater water valves often seize and what is moving is just the cable. You need to use them regularly to avoid this, more than just seasonal.

Plan "B" is Aircon. Which dehumidifies, not heats, so can work with cold engines in about 30 seconds.

Hope this helps, cheers Kiwi


48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

And when it was laid to waste, they called it peace.


 
Gene_Schneider 
Ultra Senior Member
Posts: 12132

Loc: Wisconsin..USA
Reg: 09-27-02
01-10-18 04:26 PM - Post#2720710    
    In response to Bel Air kiwi

You have water or coolant in the heater case and it is evaporating. This is NOT a "normal" problem and should not happen.
Do you have the cheap recirculating heater or Deluxe Air Flow heater?

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 
ledzepn 
Forum Newbie
Posts: 40

Loc: Washington
Reg: 03-17-17
01-12-18 12:20 PM - Post#2720866    
    In response to Gene_Schneider

I don’t know what brand it is. How do I find out?



 
Gene_Schneider 
Ultra Senior Member
Posts: 12132

Loc: Wisconsin..USA
Reg: 09-27-02
01-12-18 08:44 PM - Post#2720899    
    In response to ledzepn

The fresh air heater is larger and mounts on the side because it takes in air from the louvers on the side of the cowl.
The little heater mounts to the fire wall

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 
bobschevytrucks.com Ecklers Chevy Trucks
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