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chrisjocko 02-25-2012 07:44 AM

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

1putt 02-25-2012 07:59 AM

was it blowing hot before you got it flushed and put in a new thermostat?

75gmck25 02-25-2012 08:03 AM

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.


1putt 02-25-2012 08:10 AM

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.

Fleetliner 02-25-2012 10:22 AM

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.

EOD Guy 02-25-2012 11:23 AM

Bad themostat, has happened many times to me, put a new one in and no heat.

matts37chev 02-25-2012 11:44 AM

the flush plugged the heater core, is my first thought
double check that thermostat

EOD Guy 02-25-2012 04:55 PM

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

T-bucket23 02-26-2012 02:19 PM

Air pocket is also a possibility.

matts37chev 02-26-2012 02:36 PM

probably never know
that was his #1 post :smash:

nine4gmc 02-26-2012 03:22 PM

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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