Bypassing heater core on 99 xj
03-30-2014, 04:51 PM
#1
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Year: 1999
Model: Cherokee
Engine: 4.0L Straight 6
Bypassing heater core on 99 xj
So I'm planning to bypass the heater core. Do I just unplug both heater hoses and connect them together at the firewall?
Also, do I need to burp the system or is this not necessary on a non renix open system? If I do, how do you burp it?
Also, do I need to burp the system or is this not necessary on a non renix open system? If I do, how do you burp it?
03-30-2014, 05:54 PM
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
A 90 degree 3/4" X 5/8" fitting from the parts store makes the bypass really easy. We carry one in the glove box in case of an emergency.
03-30-2014, 07:50 PM
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Year: 1999
Model: Cherokee
Engine: 4.0L Straight 6
Does anyone have any pics of a bypass on a 97+ ?
I'm reading mixed info online of if burping is required to get the air out on a open cooling system (1991 and newer???). Will air get trappedby removing hoses?
I'm reading mixed info online of if burping is required to get the air out on a open cooling system (1991 and newer???). Will air get trappedby removing hoses?
03-30-2014, 07:54 PM
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Year: 2004
Model: Grand Cherokee (WJ)
Engine: 4.0 Inline 6
Must be the year for heater cores to go out....
If you are concerned with air bubbles, just take the radiator cap off and run the jeep for a bit to circulate the coolant and it will get the air out.
If you are concerned with air bubbles, just take the radiator cap off and run the jeep for a bit to circulate the coolant and it will get the air out.
03-30-2014, 09:46 PM
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
When the motor is cold (after a heat/cool cycle), remove the radiator cap. If coolant is full up in the neck of the rad, system has "burped". If not, add coolant. Check again after another heat/cool cycle.
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