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Old January 7th, 2011, 06:01 AM   #1
sbowen574
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89 4runner with 3.0. Im having problems getting my heat to blow hot I changed the thermostat and it has enough fluid and I checked upper radiator hose and have flow the blower works and the heater valve opens/closes just fine. It wont blow hot sometimes if I leave it off I can turn it back on and get a little heat for about 15-20 seconds but then ice cold and stays that ways even if I let me truck sit for an hour. Please help I use this for a DD and to deliver pizza and not having heat is getting very old
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Old January 7th, 2011, 06:34 AM   #2
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It could be your heater core is bad. Thermostat, heater core, antifreeze and a warm engine is all you need. Good luck!
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Old January 7th, 2011, 07:08 AM   #3
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The heater core is not leaking at all and I unhooked the hoses and poured water into it and it flowed through is their anything I can run thru it to try and clear it out?
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Old January 7th, 2011, 07:46 AM   #4
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when its running & all hooked up do both the heater hoses going to & from the heater core get warm? Ive had cores get clogged w/ mud on the outside & no air blowing thru it just around it got warm after it was cleaned
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Old January 7th, 2011, 08:27 AM   #5
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Yes both the hoses get hot. Is there anyway to get to the core without removing the dash? I changed the heater core to one that was new to me and I don't want to spend another 7 hours doing it especially since its now 20° out
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Old January 7th, 2011, 09:14 AM   #6
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Yes both the hoses get hot. Is there anyway to get to the core without removing the dash? I changed the heater core to one that was new to me and I don't want to spend another 7 hours doing it especially since its now 20 out

If the heater core is flowing well, and everything else is good, it should be working. However since it is not... Perhaps there is some other reason coolant is not flowing TO THE CORE.

If that were the case the heater core would slowly heat up just from being in proximity to hot fluid, so you'd get a bit of heat for 20 - 30 seconds as you said, then it would cool off.

I had this same sort of issue with a car before. Even replaced the thermostat. There was a slow leak in the coolant system. So there would usually be enough coolant to cool the engine, but not enough to reach the core. The engineers usually design the coolant system to put priority to cooling the engine, then if there's only enough coolant for the engine you won't get heat.

Once I topped it off, the heat started working again. I know you said that the fluid was fine, but I would double check. :D

Good luck.

Josh
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Old January 7th, 2011, 10:29 AM   #7
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Thank you all for trying to help. I've been dealing with this problem for a month now and I've checked the coolant twice a week during this period and tried "burping" the system and nothing I do seems to help. I tried closing the valve to the core and revving the engine and opening the valve holding the build a little pressure behind the valve which seemed to help once but its now back to no heat. I thought about hooking my garden hose to the inlet on the core hoping to try and push more fluid through and maybe get it to flow a little better..... I'm gonna try and hook up the hoses backwards and maybe that may help idk. Anyone change a heater core without removing the dash on these?
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Old January 7th, 2011, 11:15 PM   #8
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Ok soooooo I deleted some hoses and the valve and also reversed them andddddd......... I know have heat like never before it almost blows as hot as my 2005 Lancer
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Old January 15th, 2011, 02:13 PM   #9
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Ok soooooo I deleted some hoses and the valve and also reversed them andddddd......... I know have heat like never before it almost blows as hot as my 2005 Lancer
Sweet. Were any of the hoses you deleted clogged?
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Old January 16th, 2011, 12:24 PM   #10
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so, the heater control valve was bad?
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Old February 11th, 2011, 04:24 PM   #11
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you may have a blow head gasket and getting an air pocket thru the heater core. Basically when those go you pump air fuel/combustion stuff into the water jacket.
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Old February 11th, 2011, 04:41 PM   #12
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you may have a blow head gasket and getting an air pocket thru the heater core. Basically when those go you pump air fuel/combustion stuff into the water jacket.
He resolved his issue roughly a month ago, but thanks for playing.
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