Question about 1997 Jeep Grand Cherokee

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I have a 1997 jeep g c.. about 2 years ago i had to have a heater core put in it. since then i have not had as much heat as i had before. even on high i hardly have enough heat to keep the jeep warm inside. we have checked the blend doors and they are working fine. the only thing i haven't checked is the heater motor. this all happened when we changed the heater core. does anyone have any ideas? Also, when i increase my speed the A/C and Heat (what heat i have) blower are goes from the bottom vents to the top vents. as soon as the engine comes back down the air comes back to the bottom vents. This also happened during fixing the heater core. Any help would be appreciated. thank you

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You may have a vacuum leak affecting the vacuum supply to the control switch. I don't have the manual for your car, but if you have a vacuum operated valve on your heater hose, that could also limit the flow of hot water to the heater core. Look for the small vacuum line that goes from the engine intake manifold through the firewall to the control switch. Look closely at the connection to the intake manifold, as that is one of the primary failure modes. the other typical failure is the vacuum switch itself. If you can get to back of the control switch and pull the vacuum connector off the switch, check for vacuum on the supply line from the engine with the engine running. If you're getting a good vacuum there, your switch is likely the problem. Let me know if you have more questions.

Posted on Sep 13, 2010

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Check the vacume hose under hood on left side next to a/c conector line by firewall check for cracks or disinegrated

Posted on Sep 15, 2010

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REMOVAL
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