Second Heater problem - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 12-26-2000, 12:58 AM
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Second Heater problem

I put a second heater in my CJ-7 I split the heater hose comming from the intake manifold to the heater but now it wont flow properly less heat now then before any recomendations I bled it already thinking it was airbound.
Its a 258 I6

85 CJ7 very rusty
SE Wisconsin
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post #2 of (permalink) Old 12-26-2000, 01:22 PM
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Re: Second Heater problem

Put the two heater cores in series, on feeding the other.

Happy Holidays and Safe Jeepin'

Larry
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post #3 of (permalink) Old 12-27-2000, 07:52 AM
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Re: Second Heater problem

[img]/wwwthreads_images/icons/smile.gif[/img] Larry is right. Go IN the bottom of the front heater, and out the top. Then go to the second heater and then back to the engine. It'll be fine.[img]/wwwthreads_images/icons/crazy.gif[/img]

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post #4 of (permalink) Old 12-27-2000, 11:42 AM
 
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Re: Second Heater problem

I have dual heaters in my CJ7 and I used Y fitting to split both hoses at about half way to the heater core. Works great. Both heaters generate heat and no reduction from previous heat levels generated by the oem heater.

Tim

84 CJ7, 258, HEI, M/C 2100 carb, 5 inch lift, RS9000's, 33x12.5 BFG M/T's, Lockright, full cage & belts, Xenon flares, AMC 20 1pc axles, GM dual diaphragm brake booster
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post #5 of (permalink) Old 12-28-2000, 10:05 AM
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Re: Second Heater problem

I did put them in series

85 CJ7 very rusty
SE Wisconsin
post #6 of (permalink) Old 12-28-2000, 10:29 AM
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Re: Second Heater problem

If you've got them in series and there is no coolant flow... I'd bet one of the core's is restricted. Try the following:

1. Plumb only one heater to the coolant flow.
Does it work fine?

2. Plumb only the second heater to the coolant flow.
Does it work fine?

If the ansewer is no either question...one of the cores is plugged.

If the answer is yes, both cores are "probably" Ok.

3. Reverse the inlet and outlet hoses from the engine.
Has heat been restored?

4. Are there size differences between two core inlets and outlets.

Try pumbing in parallel and see if you get heat out of one, but not the other core. The one that's not heating, likley is plugged.

I'd be surprised if one of the cores was NOT going south on you. On my CJ I've turned the AC evaporator under the dash into a very effective heater. It's outlet and inlets are about 1/2" brass, that Y into two 1/4" pipes that actually feed the core. This adaptation will drive you out of the cab at well below zero temps.

So, to make a long post short: Re-examine the coolant flow for restrictions.

Happy Holidays and Safe Jeepin'

Larry
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