Question about 1998 GMC Jimmy

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1998 Jimmy with electrical controls for temperature. Replaced Themostat, Flushed heater core, replaced damaged vacuum lines. Vehicle produces heat to heater core but only luke warm interior temp. Rotated interior temp contol but no noticable change of temp. All dampers appear to be working. Checked elecrical current to temp control weak. Any ideas or a method to check temp control. Thanking you in advance.

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  • Anonymous Mar 18, 2014

    change thermotat heater core radiator cap

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Suggestion: see if the blend door opens or closes completely to allow all air through the heater core. To see the blend door moving, remove the panel that says "Cut here for service" under the hood along the firewall. I have a 99 Bravada where the blend door keeps moving back and forth constantly. Changed the blend door actuator but still keeps moving. The air inside is only warm since the door keeps allowing bypassed air through.

Posted on Jan 04, 2011

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Posted on Jan 02, 2017

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