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82 subaru gl, heater not throwing heat
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wdano
Novice
Nov 29, 2008, 6:05 PM
Post #1 of 5
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82 subaru gl, heater not throwing heat
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i just bought a 82 subaru gl, many little things to fix, first off all is the heat problem...no heat...car is 1.8l 2wd wagon, has 262000km, problem...heat selector switch seems to be working (proof -- is slight change in temp when selector turned from hot to cold), changed thermostat, checked fuses and blower, all ok...with little knowledge, i am suspecting water pump or heater core...when car idles heat guage builds, if you then turn on blower a very short shot of warmth with come then die off rather quickly...also, if you idle car then drive it heat will build to almost half of heat guage, then when driving heat guage drops to almost quarter of gauge within minutes...any further info...when engine warm rad hose to rad is warm (hot really), rad then warms, and hose from rad to water pump warm, once all warm both feed and return hoses for heater are warm, yet no warm air from heater...any ideas....
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 29, 2008, 6:33 PM
Post #2 of 5
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Re: 82 subaru gl, heater not throwing heat
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Sounds like this would benefit from a good general flush of everything - thermostat out and both directions on as much as you can. AYOR to use flushing products as I worry with older vehicles what they might find sleeping that could be fine if not aggrevated.
Temp gauge should be steady all the time so that alone indicates it's not perfect especially if noticed in cooler weather. Flush away and don't overdo the anti-freeze. Watch that and if totally flushed out you know there's some plain water left so add no more than 50% of listed capacity first then just water,
T
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wdano
Novice
Nov 29, 2008, 7:02 PM
Post #3 of 5
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Re: 82 subaru gl, heater not throwing heat
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okay...will try flush...am fairly handy around a car, yet not familiar with your technique for flushing with "thermostat out" and in both directions, can you elaborate some for me..thanks
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 29, 2008, 7:29 PM
Post #4 of 5
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Re: 82 subaru gl, heater not throwing heat
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Ok: Thermostat will be cold and shut tight of course when doing this so you get a good/better shot at flushing with plain garden hose thru that and removed radiator hoses as needed. Hold hose and allow direction of water to push backwards thru radiator and engine as possible can dislodge more gunk which should help. Same with heater core. Careful with hoses connected right to a core as they can be good an stuck and break the core in removal. Sacrifice hose if needed NOT the core! Same is true of radiator inlet/oulets - they can break if removal is a fight.
It's just a good time to refresh coolant ( as hazmat BTW so dispose of collected old properly) and a new thermostat while you are there is the common suggestion.
More: I suggest the garden hose way and not full force of water but rather just hold with a rag on hoses and items to allow flow and watch till clear then reverse direction. Silty gunk should flush out. Some crusty blockages won't flush so easy or at all and some may require a radiator or heater core replacement. They used to acid boil them out but most won't take that when older and replacements may be reasonable. Heater core replacements are usually quite a job so try to get that to flow well both ways and save it.
Even in '82 many hoses are custom molded for the car and replace as you see fit or budget allows. New radiator cap is always a good idea too. Actually - you can run up quite a ticket with hoses, t-stat, gasket, clamps and the anti-freeze even doing this yourself!
Re; The flush solvents sold: They scare me a bit so I avoid that stuff if flushing appears to work. If that core really doesn't flow well I might try using flush solvent isolated to just it and not the whole system.
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Do keep in mind that the commonly used EG = Ethylene Glycol is a hazmat AND animals may try to drink it so don't leave it around on open pans. Also already said is that too strong a mix isn't helpful so avoid that - read container and know system capacity + do the math,
T
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wdano
Novice
Nov 29, 2008, 7:43 PM
Post #5 of 5
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Re: 82 subaru gl, heater not throwing heat
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thanks tom, will get at that as soon as i can, car is a spare in the event either my wife or i have a break down with one of ours, as i do do most of our auto repairs myself, sometimes its not the best time to be rebuilding drum brakes in a snow filled driveway at 2 am 'cuz she needs to be at work for 8 am...that said, i will repost with results after flush...thanks. dan.
ohh, talked this flush with my father, also a back yard mech-anik...he wants to know if using a descaler like CLR or lime-a-way (household stuff) would be softer than automotive flushes, or would this not be a good idea at any age of car...thanks again
(This post was edited by wdano on Nov 29, 2008, 7:48 PM)
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