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Unread 01-02-2014, 09:43 AM   #1
dmoore_64
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258 Heater hose routing

Hey guys!
I have an 82 258 engine in my 74 cj5, and I am not sure of the heater hose routing. It has the coolant passage through the intake manifold. The way that I have it ran is, heater hose from small port on water outlet to front port on intake, from rear port on intake to port on heater core, from other port on heater core to small port on water pump.
My problem is that it never seems to get above the lower mark on the temp gauge and my heater only blows out warm air, never hot air.

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Unread 01-02-2014, 10:32 AM   #2
CSP
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Your hose routing is correct. Is the coolant itself getting hot? If so, I would suspect blockage in the heater core possibly.
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Unread 01-02-2014, 10:56 AM   #3
dmoore_64
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Hoses seem to be getting hot, and heater core was replaced about a year and a half ago, when I rebuilt Jeep.
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Unread 01-02-2014, 12:41 PM   #4
CSP
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Perhaps there's an air bubble in the loop preventing coolant from circulating in the core.
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Unread 01-02-2014, 02:14 PM   #5
EgulAye
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The top of the heater core should be the inlet from your intake manifold. The bottom is the outlet to the water pump. I just switched mine yesterday to match the TSM and it's made a difference. (mine is a '78 232 in an '80 CJ5, but I suspect the setup is/should be the same)
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Unread 01-02-2014, 02:22 PM   #6
gosupes
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Quote:
Originally Posted by dmoore_64 View Post
Hey guys!
I have an 82 258 engine in my 74 cj5, and I am not sure of the heater hose routing. It has the coolant passage through the intake manifold. The way that I have it ran is, heater hose from small port on water outlet to front port on intake, from rear port on intake to port on heater core, from other port on heater core to small port on water pump.
My problem is that it never seems to get above the lower mark on the temp gauge and my heater only blows out warm air, never hot air.
What temp is your t-stat?
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Unread 01-02-2014, 02:38 PM   #7
dmoore_64
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It is a 195 deg t-stat. Could be a bubble but I don't think so, I have had it running with cap off many times.
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Unread 01-02-2014, 05:27 PM   #8
CSP
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Taking the cap off won't eliminate a bubble in a spot that's higher than the cap or even one that's lower than the cap but has coolant between the bubble and radiator.
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Unread 01-03-2014, 02:44 AM   #9
turkish6
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What would be the proper way to remove a bubble?
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