Four Seasons 74618 heater control valve for the 2002-2006 Chevrolet Trailblazer and other vehicles regulates coolant flow to the heater core, and vacuum closes it.
- Engineered and tested for years of trouble-free operation, backed by over 50 years of Four Seasons mobile A/C experience
- Vacuum controlled, non-bypass design
- Temperature tested to 270 degrees F
- Pressure tested for a leak-free design
- Application-specific design
Coolant leaking at the valve, weak cabin heat or heat that won't shut off can mean the HVAC heater control valve is worn, though a clogged heater core or a faulty blend door actuator can be behind them too. Find the cause before you replace the valve.
The 2002-2006 Chevrolet Trailblazer, 2003-2008 Isuzu Ascender and 2002-2006 Chevrolet Trailblazer EXT all fit this valve, and so do other vehicles. Open the "Vehicles it fits" section to check your exact model and engine.
Specifications
Fit and size
- Quantity per vehicle: 1
- Number of connectors: 3
Build and materials
- Material: Plastic
- Operation: Vacuum
- Style: Non-bypass
- Country of origin: China
In the box
One heater control valve. A vehicle takes a single valve, and this listing holds one.
Interchange: 155886 · CWK801040 · 6601358 · 801040 · 11174618 · 15772294 · 19352077 · H522 · 8211269 · 8157722940 · 8193520770 · H77993 · HV1211 · HV1211C
This part cross-references / interchanges with the following part numbers:
155886, CWK801040, 6601358, 74618, 801040, 11174618, 15772294, 19352077, H522, 8211269, 8157722940, 8193520770, H77993, HV1211, HV1211C
Frequently Asked Questions
Is this the right 2003 Trailblazer heater control valve, and does it cover the 2002-2006 Chevrolet Trailblazer?
Yes. Four Seasons 74618 fits the 2002-2006 Chevrolet Trailblazer, 2003 included, with one valve per vehicle. Check the "Vehicles it fits" section for other models.
Does the Four Seasons 74618 fit the 2003-2008 Isuzu Ascender?
Yes. Four Seasons 74618 is a direct-fit heater control valve for the 2003-2008 Isuzu Ascender.
How hot has this heater control valve been tested?
It is temperature tested to 270 degrees F. It is also pressure tested for a leak-free design.
How is the Four Seasons 74618 operated, and how many connectors does it have?
It is vacuum controlled, and vacuum closes this non-bypass valve. It has 3 connectors.
Does the Four Seasons 74618 replace 15772294 or HV1211?
Yes. Four Seasons 74618 replaces numbers including 15772294 and HV1211. The full cross-reference list is at the bottom of the description.
