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1997 GMC Sonoma intermittently blows luke warm air
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william turcotte
New User
Jan 14, 2012, 1:53 PM
Post #1 of 2
(3223 views)
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1997 GMC Sonoma intermittently blows luke warm air
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My 1997 GMC Sonoma Pick Up has heater problems. I recently changed themostats and antifreeze hoping to get my truck to blow hot air. This did not help the problem. It never blows hot and I usually only get luke warm air and sometimes it only blows warm for a short while and then blows cold. I have been keeping a very close eye on the anti freeze level in the reservoir but it seems to be fine??
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 14, 2012, 3:11 PM
Post #2 of 2
(3190 views)
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Re: 1997 GMC Sonoma intermittently blows luke warm air
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With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If not too hot to hold, then you have to look at the actual engine temp and if that is up, if it is, then your looking at a restricted heater core.
If you find that they are both too hot to hold, then the heat in that vehicle is controlled by a blend door that regulates heated air flow. it is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.
If they are both not too hot to hold on to, then you either have a restricted heater core or the system is not completely full and getting air pockets for some reason.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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