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Winters Comming! And I Have WEAK Heat :(; What i've already tried, and what im proposing
Topic Started: Sep 23 2017, 12:16 AM (425 Views)
coreyare
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Hi all, my 91 Metro is working GREAT in the summer time, with ice cold AC to cool that hot sweaty cab!

Well that's all fine and dandy but winter is coming, and it's a little dangerous to have the ladies cuddling up with me to warm up while i operate a stick shift on slick country roads....



The complaint is:

Vehicle is nice and warmed up, no evidence of stuck open thermostat



When I run the heat on full blast its nice and toasty briefly and immediately cools down to about luke warm temperatures ,





What I've tried:

Ive removed the hose coming from the firewall to the tube that goes from WP to lower rad hose, AND the hose coming from the tube that connects from the thermostat housing to the intake manifold, I was unable to disconnect the hose coming from the firewall to the intake as it seemed to be weathered on there quite well...

I then used a garden hose with a nozzle on it to back flush the system, and flow came a pouring out of that front most bottom spigot on the intake manifold, so that there tells me we have flowage.

Posted Image

Did it work?:

Bled air out of the cooling system using my spill free funnel and keeping the r's at about 2500 rpm

Nope, heat is still weak.



My proposal:

Looking at pictures of a geo metro heater core reveals that my simple garden hose nozzle back flush may do little to no good D: and that drastic measures may be needeth to be taken!

I was going to fill the core thru the hoses with CLR and let it soak for a bit, let it work its magic for about an hour i'd say?


After that I would use compressed air, blow the stuff out, fill with water, rinse and repeat until no more evidence of clr was found, maybe even rinsing with water pressure and try again.

Any other suggestions?

Thanks !



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nwgeo


Get a new heater core. My old ones were scaled up and no matter how much I cleaned I still could not get a great amount of heat of them. New heater cores.... BLOWs me out of the car even when it is below 0F
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1DCGUY
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Don't be a "Richard"

I'm going to agree with nwgeo, a new heater core is probably the way to go.
Before you install a new one, and you are positive everything else is working properly, try using a pressure sprayer with high pressure. I've done this a few times with great results on 2 occasions, and then a couple that didn't help. The couple that didn't seem to work, were from cores that a previous owner had used a stop leak product and the cores were completely plugged. At that point replacing the core is really your only option. But if your lucky enough, the high pressure may clean out something in the core and you won't have to pull the heater box.
Let us know how it turns out. :thumb
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91 ragtop
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I just got a 91 running that doesn't put out much heat either. I think mine might me a mouse issue as I've found mouse turds in the vents. The hot and cold lever doesn't go all the way to hot like it's hitting something so I might have to pull the heater box out and take a look.


Ken..............
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metroschultz
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Please just call me; "Schultz"

I filled one (Focus) heater core with Clorox, let it sit overnight , then rinsed it profusely with clear water form the hose. This gave the owner acceptable heat, but was still not !!!OMG!!! hot. Good enough to clear the windshield & keep her warm on the road to work.
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Car Nut
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91 ragtop
Sep 23 2017, 12:10 PM
I just got a 91 running that doesn't put out much heat either. I think mine might me a mouse issue as I've found mouse turds in the vents. The hot and cold lever doesn't go all the way to hot like it's hitting something so I might have to pull the heater box out and take a look.


Ken..............
I hate it when that happens. Makes me want to get a cat.
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91 ragtop
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I fixed mine today. It was a mouse house. It had half the matting that is supposed to be under the carpet in there. It was above and below the door that shuts off the cold air so you can get heat through the heater core. It only takes about 30 seconds to pull the tube between the heater box and the fan to see if something is in there.

Ken............
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nwgeo


I hate the smell of mouse in a car, oh man I hate that smell.
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coreyare
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Well...crap....I guess ill attempt the CLR method and use compressed air to dislodge any scrod, should've checked for mouse nests before i equipped the car with AC :O if that doesn't help ill dear the dash out and check the heater box >:D
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coreyare
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Figured it out, I'm a vehicular hypochondriac, and its a tiny car. Letting it sit idle, 15-20 minutes, re-circ, gets the car nice and toasty!
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