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'98 cherokee sport won't start after replacing heater core

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'98 cherokee sport won't start after replacing heater core

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Old 08-24-2015, 08:17 PM
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Default '98 cherokee sport won't start after replacing heater core

Good evening all. This is my first post and I'm sorry if this has been covered in another post, but I have searched and only found posts similar to my problem but not exactly what I have going on. My son just bought a 98 cherokee sport 4.0l and we replaced the heater core. Now it won't start, won't turn over, click, nothing. When I turned to key to the "on" position the dash lights came on and when I turned it to "start" the dash lights and radio would go out and the brake light would come on. I tried it in park and neutral, even jiggled the shifter in both positions, and still nothing. We took the dash apart thinking we missed a connection somewhere, but everything was connected. All the posts I have seen talked about the NSS or starter. My son bought it last week and we put about 50 miles on it and was started at least a dozen time before hearter core replacement, with no problem. I find it hard to believe the NSS or starter would just go without out any signs, but I'm not a mechanic. Any help would be greatly appreciated. Thanks.
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Old 08-25-2015, 11:51 AM
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Was the battery disconnected before and during heater core service? Did you re-check for clean and tight battery post connections, jump it or try another battery?
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Old 08-25-2015, 02:31 PM
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Do you have fuel? Do you have spark? Did you make certain the PCM is plugged in? Did you perhaps spill coolant on an electrical connection? They're can be sensitive and it happens.
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Old 08-25-2015, 03:23 PM
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Originally Posted by seansr View Post
Good evening all. This is my first post and I'm sorry if this has been covered in another post, but I have searched and only found posts similar to my problem but not exactly what I have going on. My son just bought a 98 cherokee sport 4.0l and we replaced the heater core. Now it won't start, won't turn over, click, nothing. When I turned to key to the "on" position the dash lights came on and when I turned it to "start" the dash lights and radio would go out and the brake light would come on. I tried it in park and neutral, even jiggled the shifter in both positions, and still nothing. We took the dash apart thinking we missed a connection somewhere, but everything was connected. All the posts I have seen talked about the NSS or starter. My son bought it last week and we put about 50 miles on it and was started at least a dozen time before hearter core replacement, with no problem. I find it hard to believe the NSS or starter would just go without out any signs, but I'm not a mechanic. Any help would be greatly appreciated. Thanks.

I don't think it's a NSS issue.


Recheck all connectors under the dash, and at the steering column.


C201 is often overlooked for being secure (bolt tightened), check it.


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Old 08-30-2015, 01:32 PM
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Thanks for the input everyone. My son and I tore the dash out 3 times, checked connections under hood and found nothing. 😡 We figured the last thing to try was the NSS. I followed a post on here that explained how to take it apart and clean it. It took about an hour and a half and the thing starts right up. I didn't think the switch would just go like that but it did. So if anyone in NW CT needs a hearter core or NSS just let my son or I know we are experts now. 😀
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Old 08-30-2015, 01:50 PM
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Yeah, they can go that fast. Glad you got it fixed and learned something in the process.
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Old 09-12-2016, 02:58 AM
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4WD4EVER. AGREE 100%. Starter does go bad with no warning. Starter an easy fix!
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Old 09-13-2016, 02:17 PM
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Take your son. A set of wrenches. A bag of brill pads. (No soap) Nad follow cruiser54's tips on clean your grounds. It's good bonding time with your kid. And keeps them running. Cheap. Only cost elbow grease.
I also checked/cleaned the connections to the main fuse box in the engine bay. It corrodes.
Grounds. Grounds. Grounds.
They are weak in this vehicle. And keep it running!
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