No Heat??? - Toyota Tacoma Forum
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#1 (permalink) Old 12-23-2008, 08:42 AM
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No Heat???

Hey Guys,

Have a 93 4Runner that wont push heat through the heater. It is circulating properly and the rig has a new thermostat but just doesn't produce any heat in the cab. Just as background information, the runner has a new head gasket and the previous owner had installed the battery backwards and blew the alternator fuse. (The only thing it blew I believe). Any ideas and suggestions are greatly appreciated as always! Thanks and Merry Christmas!
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#2 (permalink) Old 12-23-2008, 08:47 AM
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Re: No Heat???

Just so we're clear ... When you say it's 'circulating properly', do you mean the coolant / fluid is circulating, or the fan is circulating air, or both?

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#3 (permalink) Old 12-23-2008, 08:55 AM
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Re: No Heat???

ok just for starting point there is a heater control valve on the firewall there should be two 1/2 in hoses going to it . are they hot on both sides?? try having a friend move the temp knob and check for cable movement. If it moves check the hoses for heat if it doesn't move the cable try unsnapping the cable and move it manually till both hoses get hot. Thats the basic starting point.

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Last edited by xsvtoyz; 12-23-2008 at 09:15 AM.
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#4 (permalink) Old 12-23-2008, 09:00 AM
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Re: No Heat???

Fluid is circulating and the fan comes on, pushing cold air through the vents....
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#5 (permalink) Old 12-23-2008, 09:13 AM
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Re: No Heat???

Quote:
Originally Posted by xsvtoyz View Post
ok just for starting point there is a heater control valve on the firewall there should be two 1/2 in hoses going to it . are they hot on both sides?? try having a friend move the temp knob and check for cable movement. If it moves check the hoses for heat if it doesn't move the cable try unsnapping the cable and move it manually till both hoses get hot. Thats the basic starting point.
start here! and let us know what you find!

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#6 (permalink) Old 12-23-2008, 09:17 AM
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Re: No Heat???

This control valve is on the engine side of the firewall?
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#7 (permalink) Old 12-23-2008, 09:21 AM
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Re: No Heat???

yes sir . its a small cigarette pack sized black box 2 hoses and a cable running to it. controls the water flow to the heater core.

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#8 (permalink) Old 12-23-2008, 09:22 AM
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Re: No Heat???

Got it. Will let you know what that tells me. Appreciate it!
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#9 (permalink) Old 12-23-2008, 11:15 AM
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Re: No Heat???

Checked the valve. Lines are both hot and the dash control for the heat's cable is working freely. Only a small amount of warm is coming through though. Changed the relays as well...??
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#10 (permalink) Old 12-23-2008, 03:45 PM
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Re: No Heat???

then it has to be either a clogged heater core or a vent door not opening or closing. usually the cable for that is down near the passengers feet. there is another thread that has the cable routing.
I think it reads "my heater control only turns half way".

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