2004 Jeep Cherokee A/C works but not heat for both sides of

SFRYE

MEMBER
2004 JEEP CHEROKEE
6 CYL
2WD
AUTOMATIC
91,000 MILES

I replaced a thermostat (which was bad) and a coolant temp sensor in hope that the heat would come since the engine was not getting to normal operating temp due to bad thermostat (stuck open). The engine does now come up to normal operating temp but no heat through the vents, just A/C which is good. My question. Is / are the blend door/s or recirc doors bad or both? Any way to diagnose before major repair? By the way, when a/c operating the temp knob settings on both sides do not seem to change the coldness of a/c at all. Thanks in advance. Steve

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

Check for codes this way: Codes listed below too.
RETRIEVING FAULT CODES
1.To begin the fault code tests, depress the A/C and Recirc buttons at the same time and rotate the left temperature control knob clockwise (CW) one detent, then release the push-button. 2.If there are no fault codes, the "00" display value will remain in the VF window. Should there be any codes, each will be displayed for one second in ascending numerical sequence (note: no effort is made to display faults in the order they occurred). The left side set temperature display will be blanked and the right side set temperature display will indicate current and historical codes (8 historical max) presently active. Once all codes have been displayed, the system will repeat the fault code numbers. This will continue until the left side set temperature control is moved at least one detent position in either direction, by pressing both the A/C and Recirc buttons at the same time, or the ignition is turned off. Record all of the fault codes, then see the Current and Historical Fault Code tables for the descriptions. See Fig. 23 -Fig. 25 .