Bad Heater Core ..? Blows cold on freeway - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 02-13-2006, 10:52 AM   #1 (permalink)
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Bad Heater Core ..? Blows cold on freeway

I have a 86 Tin top, runs and drives good, Just a couple of problom's,

My heater doesnt work Does anyone know were the valve on the firewall is located ?

and or how to clean out a heater core ? and the location of the heater core?

im new to the world of sammi's

thanks
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Old 02-13-2006, 11:17 AM   #2 (permalink)
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The heater valve is located on the upper firewal on the passenger side. The heater cores are prone to getting a bunch of junk in them. Search and you will find some pretty good how-to writeups on cleaning them out.
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Old 02-13-2006, 11:20 AM   #3 (permalink)
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This thread is well worth reading

http://www.pirate4x4.com/forum/showt...ht=heater+core
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Old 02-13-2006, 12:26 PM   #4 (permalink)
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thanks, i really appreciate your help
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Old 02-13-2006, 01:39 PM   #5 (permalink)
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Also check your thermostat...

If you have a bad one or one that sticks open, it wont keep the engine at normal operating temp. I found that out when I took my old zuk on a snow run, and i froze my ass off!
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Old 02-13-2006, 02:03 PM   #6 (permalink)
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Yeah im 100 % its the thermastat, the heater blows just fine, blow really good actually, just blows really cold,

im thinking its stuck open, cause the operating temp is right in the middle of the gauge,

Gonna pick up one after work, maybe flush the RAD fluids
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Old 02-13-2006, 04:12 PM   #7 (permalink)
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heat also only comes out the defrost and the foot area - not out the dash.
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Old 02-13-2006, 05:06 PM   #8 (permalink)
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Quote:
Originally Posted by Hvy_Chevy
heat also only comes out the defrost and the foot area - not out the dash.


That depends

It's only *supposed* to come out of the side window defrosters and the top windshield defrosters (aside from the foot vents)

But what can happen is the plastic tubing that goes behind the instrument cluster can split and/or come unattached, and send hot air all throughout behind the dash, escaping out through spaces around the front fresh/cool air vents.

This fakes out a lot of sammy owners into thinking the measly amount of warm air coming through their vents (the wrong ones, or the defrosters where it's supposed to be going)) is the heater's fault, when it isn't, really...
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Old 02-14-2006, 06:48 PM   #9 (permalink)
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I'd like to report that I still haven't had to clean my heater since I put that screen in there in the thread Uzi posted. It blows lots of hot air still. Do it while you have it out.
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Old 02-15-2006, 11:16 AM   #10 (permalink)
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come on now, how can you not know where the heater core is? just follow the hot air! then you just follow the coolant hoses from the firewall to find the heater valve.

By the way, be very careful when taking the hoses off of the heater valve. it's a very thin wall hose nipple and can easily be crushed when removing a hose. if it's stuck on there, cut it lengthwise carefully and peel it off. If you bust it, just bypass it for constant heat on or off.
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Old 02-15-2006, 05:48 PM   #11 (permalink)
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bad heater core

If your temp gauge is reading in the middle the thermostat is working. The problem is in the heater box. It is full of debree. It's the same problem that all Samurais have in time.
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Old 02-15-2006, 10:19 PM   #12 (permalink)
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yeah i cleaned out the heater box, and the heater valve was stuck to the cold setting, Heater works great now:

Last edited by 93liftedxlt; 02-15-2006 at 10:51 PM.
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