Heater Control Valve & Solenoid? - Chevrolet Forum - Chevy Enthusiasts Forums

Go Back   > >
Log In 

Tahoe & Suburban The power, space, and brutal towing ability make the Tahoe and its longer sibling, the Suburban, arguably the best full size SUV's on the market today.

2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

LinkBack Thread Tools Search this Thread
Old 10-05-2010, 02:17 PM
CF Beginner
Thread Starter
Join Date: Oct 2010
Posts: 7
Default Heater Control Valve & Solenoid?

On my '99 Suburban K1500 when working on HVAC I discovered the solenoid, which controls the heater control valve, was bad. When I replaced the solenoid I found that the heater was always on, in that by design the heater control valve is normally open and allows heated engine coolant to always flow to the heater core in the passenger compartment. This also seems to be the case for the rear heater. Does anyone know why the HVAC would be designed this way. If I lived in Alaska this might be reasonable but since I live in south Florida it does not work so well for me.
Reply With Quote
Old 10-05-2010, 04:30 PM
CF Beginner
Thread Starter
Join Date: Oct 2010
Posts: 7

An update to my above post. I am thinking of installing a manual valve to cut coolant flow to the front and rear heater cores. Also can anyone tell me when the existing heater control valve is supposed to be activated to cut the flow to the heater core?
Reply With Quote
Old 12-22-2013, 08:44 AM
CF Beginner
Join Date: Dec 2013
Posts: 3

The solenoid comes on and applies vacuum to the heater coolant flow valve to bypass the heater core when the selector switch is in any of the a/c positions. checked this yesterday.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Code PO449 2005 GMC 1500 Solenoid valve besse2020 General Tech 1 01-05-2016 10:27 PM
Aveo EVAP Canister/ EVAP vent solenoid valve malglot Sonic (Aveo) 12 12-22-2013 06:47 AM
P0449 Vent Valve Solenoid (VVS) Circuit Malfunction- Wrong Parts? rnorman4 Tahoe & Suburban 0 08-21-2011 09:36 AM
Evaporative Emission Control System Vent Valve/Solenoid Circuit TomClinard General Tech 0 12-18-2010 05:48 PM
fuel vent valve / solenoid gsolo TrailBlazer 3 02-24-2010 06:11 PM

96, 99, blazer, chevy, climate, control, cot, heater, hvac, k5, problem, solenoid, suburban, tahoe, valve

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -5. The time now is 08:33 AM.