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Old Dec 25, 2007 | 07:40 PM
  #1  
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v8xploder
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Heat Issues

My 87 302 bronc is being a little sob lately and not heating up. I changed the thermostat (180 degree), the coolant is nice and green hasnt been flushed in a couple years though, I back flushed the heater core and she's still acting up. shes full of coolant and i let her run for 20 min or so with the cap off to try and bleed out any air. I have not checked the heat ducts or the Blend door yet.. The temp gauge will only barely move after driving for any amount of time (but it does move) I am putting my money on the engine not completely warming up. I ran my lazer temp gauge on some things and this is what I got after driving for a half hour
Temp at vent inside 135 (degrees)
Water pump 150
upper hose 135
Those numbers seem low to me.. Any more Ideas anyone im kind of out...
 
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Old Dec 25, 2007 | 08:09 PM
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Put in a 195 degree thermostat. It is the correct one to have.
 
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Old Dec 25, 2007 | 08:36 PM
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Really? That sucks! I just figured 180 when I last stopped at the parts store. O well easy swap. Hopefully thats my problem Thanks for the info.
 
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Old Dec 26, 2007 | 10:39 AM
  #4  
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Heat Problems

I am having the same problem, The guy at Auto Zone recommended the heater control Valve. I can not find it in any of the books that I have. Does this even exist on a 89 ford bronco. This was after I replaced the heater core.
 
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Old Dec 26, 2007 | 01:31 PM
  #5  
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helirich
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It could be that your thermistat is no good. I've had several that were bad right out of the box.
 
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Old Dec 27, 2007 | 11:29 AM
  #6  
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Just hook up 2k+ lbs to the tow hitch, and be done with it. My Bronco runs cold year round, but heats up nicely when pulling the boat uphill...

On a serious note...
My 95 Mustang GT ran cold year round too, but it would get hot enough to produce heat from the heater. You could always try the "big-rig fix" if all else fails, and cover half of the radiator with something.
 
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Old Dec 27, 2007 | 06:01 PM
  #7  
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Have you pressure checked your cooling system? If it is not holding pressure,it won't come to proper temperature.
 
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Old Dec 27, 2007 | 09:06 PM
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This weekend im putting in the right thermostat, and going to buy a pressure tester for the radiator. Does anyone make a grill cover for the winter time to fit big broncs? Ive seen them on F150s i believe....
 
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Old Dec 28, 2007 | 08:23 AM
  #9  
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Your thermostat housing is probably like mine. I had trouble with it leaking. The problem was that the thermostat has to sit in a groove in the housing and mine kept slipping out. I finally had to use permatex and glue the thermostat in the housing before I installed the gasket and bolted it to the manifold.
 
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Old Dec 28, 2007 | 04:06 PM
  #10  
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good tip, i remember it being a bit of a pain to get it to stay in place too
 
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Old Dec 28, 2007 | 05:01 PM
  #11  
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From: Capac MI
Your thermostat housing is probably like mine. I had trouble with it leaking.
O god lol i know all about that. What i would do if i was u is put the right thermostat in it, then pressure test it. If all else fails you have a bad heater core or a huge air pocket somewhere. When you warm it up, put the cap on and as it starts to get warm put a rag over the cap and just crack it open, some antifreeze should come out and that relives the air. Good Luck
 
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