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Old 02-25-2012, 07:44 AM
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heater not workin

my heaters not workin in my 95 chevy i got a radiator flush and new thermstat and now its blowing cold air

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Old 02-25-2012, 07:59 AM
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was it blowing hot before you got it flushed and put in a new thermostat?
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Old 02-25-2012, 08:03 AM
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I had similar problems with my 2000 Ford and it turned out the new Motorcraft thermostat was bad. Are you able to have someone plug in to the OBD diagnostic port to find out what temp the engine is getting up to? If its not getting up to about 195-200 degrees at idle with a stock thermostat, the thermostat is not working right.

The other possibility is that the heater blend door is broken or not working right. On a 95 it might be cable operated, but many newer cars use an electric actuator to set the position of the door.

Bruce
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Old 02-25-2012, 08:10 AM
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or your heater core got clogged either from the flush or before or the thermostat was put in backwards or is dud. You can check it on the stove in boiling water and a pastry thermometer to see if it is opening and at what temperature.
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Old 02-25-2012, 10:22 AM
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With the engine at normal operating temp. feel both heater hoses where they go through the fire wall. If both hoses are about the same temp. then the heater core is doing its job. If one hose is considerably cooler there is a restriction to the system.(plugged core) If the heater core is flowing and there is no heat out of the vents the problem is either the blend air door or the actuator for the blend air door is not operating. Most common is the door broken.
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Old 02-25-2012, 11:23 AM
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Bad themostat, has happened many times to me, put a new one in and no heat.
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Old 02-25-2012, 11:44 AM
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the flush plugged the heater core, is my first thought
double check that thermostat
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Old 02-25-2012, 04:55 PM
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Very easy to check for a plugged heater core...... pull the heater hoses, hook one of them to a water hose, you don't have to clamp it on, just direct it into the pipe , if it's not plugged water will flow right thru
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Old 02-26-2012, 02:19 PM
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Air pocket is also a possibility.
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Chet
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Old 02-26-2012, 02:36 PM
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probably never know
that was his #1 post
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Old 02-26-2012, 03:22 PM
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he may be workin on it now. i agree with the thermostat checking BUT i would also check the vacuum line/connections going to the heater control valve, a 95 is a one of a kind critter as i found out the hard way with my yukon. it was totally different than my 94 and just as much different than 96-ups.
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