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2002 Ford F-150 Question: Little or no heat, have flushed system, replaced thermostat.

 

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MacMac1963, Jackson, GA, December 04, 2012, 19:19
 Rookie

i removed heater hoses and can flush water through core in both directions. Fan works but blows cold or barely warm water. any ideas what problem may be. oh yea core is not leaking or fogging window.

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  • Answer #1

    jethro29 December 04, 2012, 19:44
     Enthusiast

    when you turn the knob,or move the lever to change from hot to cold or vice versa,do you here any noise from under the dash? this truck has blend doors which control the temp of air that you get.they are controlled by small electric motors called actuators. in is very common for those to fail on your particuliar year and make.

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    MacMac1963, December 07, 2012, 10:38
     Rookie

    Thanks I will llisten to see if i can hear operating.

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  • Answer #2

    pushrod December 04, 2012, 20:40
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     Master

    Check heater control valve for proper operation. That black thing in the heater hose near firewall with the vacuum hose hooked to it.

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    MacMac1963, December 07, 2012, 10:39
     Rookie

    I will look and verify vacuum line hasn't been disconnected. What is best way to insure that it is working properly?

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    pushrod, December 07, 2012, 14:40
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     Master

    Toward the bottom of the valve is a lever you can see if it changes when switch temp. control.
    If it doesn't move it can be moved by hand manually to see if heat works then. A helper is handy!

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  • Answer #3

    Greg's Orange Auto (13627 Answers) , Orange, CA - (714) 361-9386
    globalhelper December 05, 2012, 06:23
     Master

    agree with both posts 1 and 2

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