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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 01-09-2009, 08:15 PM   #1
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Heater stopped blowing hot air

one day a week or two ago my heater just stopped blowing hot air, it will only blow out cold air. i cant seem to find the reason why it dosent blow hot air anymore, does anyone have any idea why it would stop or what i should check.
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Old 01-09-2009, 08:29 PM   #2
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Clogged heater core or lines to the heater core. Heater core may have just gone bad. Low on coolant?
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Old 01-09-2009, 10:22 PM   #3
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Check your heater valve as well for operation. If it wont move or open, you won't have any hot air.
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Old 01-10-2009, 12:49 AM   #4
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I 2nd the heater valve. Is it vacuum operated on these motors? I can't remember. If so, check the vacuum line running to it. Without a good vacuum source, it won't pull open.
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Old 01-10-2009, 01:45 AM   #5
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x3 on the valve..especially if it just stopped, and was previousely working fine.

in the engine bay, on the firewall, right on top(ish), is 2 hoses, and one w/a brass fitting that slides...try manually moving it in the opposite direction it is in now, and go for a drive..
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Old 01-10-2009, 07:37 AM   #6
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It is not vacuum operated, its cable operated. You can operate from inside while a buddy watches the lever action, or just disconnect the cable at the valve and operate it yourself.
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Old 01-10-2009, 07:37 AM
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1997chevyventure, 2003, 4runner, 84, 87, air, blow, blowing, celica, clogged, cold, dosent, google, heater, hot, stopped, supra

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