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yamaha221
Novice
Dec 10, 2011, 8:19 PM
Post #1 of 7
(3868 views)
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new thermostat, flushed heater core, no pressure in radiator return hose...the heat never reaches 195 and doesn't over heat
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 10, 2011, 8:27 PM
Post #2 of 7
(3859 views)
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Re: 1999 s10 no heat
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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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yamaha221
Novice
Dec 10, 2011, 9:13 PM
Post #3 of 7
(3839 views)
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Re: 1999 s10 no heat
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is there a way to bleed the air out
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 10, 2011, 9:21 PM
Post #4 of 7
(3835 views)
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Re: 1999 s10 no heat
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If you have air, that means the system is low. Follow the instructions I gave you.
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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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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 11, 2011, 3:55 AM
Post #5 of 7
(3824 views)
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Re: 1999 s10 no heat
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Yamaha - You said heat never reaches 195F? The temp gauge or the air coming out of ducts? What was the temp rating of thermostat? It could have been bent/misinstalled allowing flow too early leaving engine cold.
System doesn't hold pressure? That is regulated by the pressure cap with a tight system, as coolant warms up and expands,
T
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yamaha221
Novice
Dec 12, 2011, 12:18 PM
Post #6 of 7
(3804 views)
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Re: 1999 s10 no heat
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Thanks for all your help...it ended up being something blocking the hot/cold door by the blower under the hood everything is working like should..thanks again..
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 12, 2011, 12:20 PM
Post #7 of 7
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Re: 1999 s10 no heat
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I think you mean under the dash.
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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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