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- 24 Valve 2nd Gen Dodge Cummins 98.5-02 (https://www.dieselbombers.com/24-valve-2nd-gen-dodge-cummins-98-5-02/)

- - Heater (https://www.dieselbombers.com/24-valve-2nd-gen-dodge-cummins-98-5-02/107714-heater.html)

joecool_2002

01-11-2013 08:12 PM

Heater

I have a 98.5 cummins 24v, the heater is stuck on defrost and it wont change? I checked the vacum hoses and they appear good. Any suggestions?

jbuck

01-11-2013 10:53 PM

Its got to be one of two issues. Vacuum leak on one of the hoses or rubber elbows or a damaged blend door which controls airflow. The only way to really check for a leak is with a vacuum pump. Check the line starting at the nipple coming off the vacuum pump near the power steering pump and work back to the firewall. The rubber elbow on my 24valve was very brittle.

Good luck

Nutty Jeeps

01-12-2013 12:01 AM

I had this issue last fall. Mine was a vacuum leak on one of the lines that ran across my firewall.

joecool_2002

01-13-2013 06:34 PM

thanks guys ill check it out

jbuck

01-14-2013 10:06 AM

Vacuum schematic

1 Attachment(s)

Joecool this might help

joecool_2002

01-14-2013 04:52 PM

thanks i found it, was broke along firewall.

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