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Unread 11-24-2013, 01:47 PM   #1
ChrisCarlock
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1982 CJ7 
 
Join Date: Jul 2012
Posts: 150
Heater question

My heater blows semi warm air, probably 70 degrees but not hot air like it used to. I am currently running a 185 thermostat and all heater controls function perfectly. Would changing to a different thermostat help?

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Unread 11-24-2013, 01:59 PM   #2
walkerhoundvm
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Potentially - technically you should be running a 195* t-stat. Another possibility is that your heater core is buggered.
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Unread 11-24-2013, 02:07 PM   #3
GlennLever
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Quote:
Originally Posted by ChrisCarlock View Post
My heater blows semi warm air, probably 70 degrees but not hot air like it used to. I am currently running a 185 thermostat and all heater controls function perfectly. Would changing to a different thermostat help?
185 should give you plenty of heat out of the ducts, I would suspect stuff blocking the heater core (leaves, mud, etc), or the air mix flapper in the heater box is not blocking all the cold air and forcing it all through the heater core, or the heat core is not getting enough flow of coolant through it.

One way to check that you are getting full flow of coolant through the heater core is to make sure both the hoses at the firewall for the heater core are hot.

If you have to pull the heater box the fan motor upgrade is WORTH the effort! Do a search lots of threads on this

try these

http://www.jeepforum.com/forum/f8/cj...l#post13523652
http://www.jeepforum.com/forum/f8/he...wheel-1435600/
http://www.jeepforum.com/forum/f8/he...72/index2.html
http://www.jeepforum.com/forum/f8/he...-heavy-975999/
http://www.jeepforum.com/forum/f8/he...-motor-293665/
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Unread 11-24-2013, 02:09 PM   #4
ChrisCarlock
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If it helps both if my heater hoses are slightly warm and the same amount on both, just not hot. I'm thinking its the TStat
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Unread 11-24-2013, 02:11 PM   #5
ChrisCarlock
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My blower motor is out of a Chevy blazer, it's huge
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Unread 11-24-2013, 02:11 PM   #6
ChrisCarlock
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I honestly might think I accidentally put a 170 tstat in.
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Unread 11-24-2013, 02:18 PM   #7
GlennLever
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Quote:
Originally Posted by ChrisCarlock View Post
I honestly might think I accidentally put a 170 tstat in.
Even 170 should be hot to the touch (hoses) I suspect you are not getting good flow through the heater core, easy way to check, disconnect the hose from the rear of the block at the heater core, direct the hose out the bottom of the engine compartment and start the jeep, coolant should come out like gang busters. connect it back up and disconnect the other hose the coolant should come out of the heater core at the same rate, if not the core is plugged.
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Glenn R. Lever
Rochester, New York 14617-2012
My Cars http://www.leverfamilysite.com/vehicles.htm

My restoration thread here on the Jeep forum
http://www.jeepforum.com/forum/f8/cj...build-1269301/

New FED, Drag Racing Forum (I am an Administrator) at
http://www.frontenginedragsters.org/forum/index.php
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Unread 11-24-2013, 03:19 PM   #8
ChrisCarlock
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Shake and Bake! Coolant spewed out of one side of the heater core but not a drop on the other side. I'm assuming the garden hose trick from here.
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