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  #1  
Old 12-22-2012, 04:20 PM
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help

i have 2001 grand cherkoee limited i have a new water pump rad hoses check blen doors there are good flush out rad not sure what the problem is but i have warm air not hot coming out (rad was plug when i flush it) so does anyone else had this problem or know what going on with mine its a 4.7V8
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Old 12-22-2012, 04:53 PM
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You could have a air bubble in the system
Pull it on a slight grade , open the rad and keep pouring antifreeze into it till full
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Old 12-22-2012, 06:07 PM
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Re: help

Did you change the thermostat as well? How is the coolant temperature? If its too low due to a sticking thermostat, also the heater output will be lower.
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Old 12-22-2012, 06:09 PM
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Re: help

yes i change the thermostat and the temp gauge reads right on truck never overheats and i bleed the system no air
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Old 12-22-2012, 06:16 PM
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Re: help

Then what spyder said could be the problem, an air bubble somewhere in the heater core or lines, preventing a good flow through the heater core. Did you remove the bleeder plug when filling the cooling system? Also when the radiator was partly plugged, the same could be the case with the heater core. Did you reverse flush that one as well?
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Old 12-22-2012, 06:28 PM
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Re: help

what do you mean reverse the flush sorry i am not sure about that and yes i removed the bleeder plug spyder
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Old 12-22-2012, 06:42 PM
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I would still try leaving it run and watch the level . Air pocket can be a pain to get out.

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Old 12-22-2012, 06:49 PM
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Re: help

Quote:
Originally Posted by Frango100 View Post
Then what spyder said could be the problem, an air bubble somewhere in the heater core or lines, preventing a good flow through the heater core. Did you remove the bleeder plug when filling the cooling system? Also when the radiator was partly plugged, the same could be the case with the heater core. Did you reverse flush that one as well?
sorry what do mean by reverse flush
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Old 12-22-2012, 06:57 PM
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Re: help

Reverse flushing means that you let the flush water go against the normal flow direction. Any debris which is blocking the heatercore internally, could get out in this way. Would there be anything blocking the core internally, it would not come out when you flush it in the same direction as the coolant flows.
But as spyders says, start with the most simple action now and be sure that no airpocket(s) are left behind. Other action could be taken when you are sure that this is ok.
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Old 12-22-2012, 07:09 PM
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Re: help

thanks everyone for your advice i will try this first thing tomorrow morning and i will let you know how it turns out thanks again guys
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Old 12-27-2012, 09:19 AM
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Re: help

i just finish flushing and reverse flushing and clean out lines on heater core everything was clean not dirt in line or radiator and that did not fix problem there is a little warm coming out of vents but not hot air so not sure what is wrong
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