Question about 1986 Toyota Pickup 4WD

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Can not get the heater to work

I put in a new heater core in my 1986 pickup 4 cylinder about a year ago. It had been ran without one for some time. When the task was done I did not have any heat. I changed the thermostat, and still no heat. I took the thermostat out to let the water just flow through to see if it would eventualy warm up. I have ran it this way for about 9 months. I just checked to make sure my cables are hooked up, and that the levers are moving. I have felt my top radiator hose and it is getting warm. Now I can not remember if I ever put a thermostat back in or not. Would it blow heat with out a thermostat? What could be the problem with not getting any heat? The truck runs great otherwise. I would appreciate any help you could offer.
Thank you
James S.

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  • Toyota Ed May 11, 2010

    Question: Where does the temperature gauge read, at idle and when driving?

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  • Toyota Master
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If you have not re-installed the thermostat, then the coolant continually circulates, and will stay as cool as your rad can get it. With thermostat in, it will hold/restrict the coolant to a set temperature approx. 190F-210F and then allow it to flow through for cooling and the cycle begins again. Also make sure you run system with rad cap off for a while with heater on after installing thermostat, to bleed all the air out. Feel the temperature of your heater hoses near the firewall when engine warmed up to normal operating temperature. If both fairly hot, you should get heat, if one hot, one quite a bit cooler, you have a flow problem. That could be a valve not opening, core plugged, weak water pump, for examples. if all that checks out good, then I'd be checking my blend/air door for movement. Let us know what you find.

Posted on Nov 30, 2008

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