Check antifreeze level, if it's ok then it could be a problem with heater core
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A thermostat is a good start because it sounds like the heater core does not have sufficient flow of coolant through it, that also indicates the heater core is plugged but a thermostat is definitely the quickest and cheapest start.
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Thermostate has been relaced and the heater core blowen out. After that I can heat for 10-15 minutes then cold again?
It sounds like air could be getting into the system and into the heater core. As air flows over the fins it cools down too quick if there is air inside and therefore there is no longer heat transfer. That shows that either there is a leak and air is getting pulled into the system or the air hasn't fully purged out. If it is a V6, the intake manifold gaskets are common to leak usually at the back or front. In general when it gets cold after a few mins and air is in the system with no external leaks it could indicate an internal head gasket failure. To check that you would need a combustion gas tester. It is basically a dye that changes colour if combustion gas is detected in the coolant.
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98 Sonoma neither the heater or ac will turn on.
To troubleshoot this types of problem,click the link below
:----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the
issue.
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Engine Overheats and heater
blowing cold?
http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
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Heat blows cold on drivers
side and hot on passenger side?
http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
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No heat on car?
http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html
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Heater blows intermittently and temp
gauge goes erratic?
http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html------------Heater blows cold?
http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
---------Car heater blowing warm, but not
hot air?
http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html--------
Heater/AC blower motor not working?
http://technoanswers.blogspot.in/2012/02/heaterac-blower-motor-not-working-on.html
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A/C, heater, defroster fan, not
working?
http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html
Heater problem?
http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html---------
This will help.Thanks.
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