Heater/Defrost Controls - Followup - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Joachim · 10-16-2003, 01:17 AM

Just a followup note of thanks and additional question relating to the Heater /Defrost Controls and unit.

Posted a "what to do" question abut 6 weeks ago. Got lots of excelent help. I have since successfully fixed the controls. jewels instructions were right on the mark. I would suggest one small additional instruction (for dummies & procrastonators like me), to mark the cables as to which lever they came off of. I didn't, and had to take it apart and re-assemble.

Here is a related followup question.
When the fan motor is "ON" and the Heater/Defrost lever in the "Heater" position, should there be any air flow through the defrost vent. When I slide the Defrost "ON" there is an obvious heavy air flow.

Do I have a bad baffel/diverter that needs replacing or is there some air flow diverted to the windshield even when the heater is ON?

Again thanks in advance for your patience in educating me.

Joe

Longhorn Man · 10-16-2003, 01:30 AM

While not being 100% sure, (I have yet to have a truck with a porperly working heater) I would say that there should be nothing coming out teh defroster vents when on HEAT. You probably have a leaky seal inside the dirverter box.

JimKshortstep4x4 · 10-16-2003, 05:08 AM

I agree with Longhorn, there should not be air flow through the defroster vents with the selector on heat. It sounds like you have an ac setup and the doors in the diverter boxes are notorious for breaking away from the shaft. I would suggest pulling the box to look at the door. New diverter boxes are available or the door can be repaired.

Jim

10-16-2003, 01:17 AM	#1
Joachim Carolina Cajun Join Date: Mar 2002 Location: Concord, NC/Ponchatoula, LA Posts: 65	Heater/Defrost Controls - Followup Just a followup note of thanks and additional question relating to the Heater /Defrost Controls and unit. Posted a "what to do" question abut 6 weeks ago. Got lots of excelent help. I have since successfully fixed the controls. jewels instructions were right on the mark. I would suggest one small additional instruction (for dummies & procrastonators like me), to mark the cables as to which lever they came off of. I didn't, and had to take it apart and re-assemble. Here is a related followup question. When the fan motor is "ON" and the Heater/Defrost lever in the "Heater" position, should there be any air flow through the defrost vent. When I slide the Defrost "ON" there is an obvious heavy air flow. Do I have a bad baffel/diverter that needs replacing or is there some air flow diverted to the windshield even when the heater is ON? Again thanks in advance for your patience in educating me. Joe __________________ The Carolina Cajun, almost famous in North Carolina since 1989! Driving a 68 & Restoring a 66. Lookin' for Rochester Manual 1bbl & 2bbl carbs!! Concord, NC & Ponchatoula, LA

10-16-2003, 01:30 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	While not being 100% sure, (I have yet to have a truck with a porperly working heater) I would say that there should be nothing coming out teh defroster vents when on HEAT. You probably have a leaky seal inside the dirverter box.

10-16-2003, 05:08 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I agree with Longhorn, there should not be air flow through the defroster vents with the selector on heat. It sounds like you have an ac setup and the doors in the diverter boxes are notorious for breaking away from the shaft. I would suggest pulling the box to look at the door. New diverter boxes are available or the door can be repaired. Jim



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