# Auxiliary Coolant Heater Service in Riverside, CA

Canonical: https://commercialvanrepairshop.com/services/hvac-comfort/auxiliary-coolant-heater/
Business: Commercial Van Repair Shop, Yorba Linda, CA. Serving Riverside, California.
Phone: (714) 646-1433 | Email: info@ocrvcenter.com

Auxiliary coolant heater service restores a Sprinter's factory cab pre-heater, the booster that warms coolant for faster heat and defrost on a cold morning. When it quits, the cab takes forever to warm and the windshield stays fogged, which slows a driver down before the first stop. Our Yorba Linda shop diagnoses the heater, its fuel supply, and its controls, then repairs it so the cab heats up quickly. This is the factory cab heater, not a cargo or living-space heater.


## What this includes
- Diagnosis of the factory auxiliary coolant heater and its controls
- Fuel supply, glow pin, and combustion fault testing
- Heater unit cleaning, repair, or replacement
- Coolant circuit and pump check on the booster loop
- Timer, climate control, and activation testing
- Verification of quicker warm-up and defrost after repair

## Who it is for
- The cab takes a long time to warm on cold Inland Empire mornings
- The factory pre-heater no longer runs or sets a fault
- Defrost is slow and the windshield stays fogged
- You want the booster heater working before the winter route season

## Pricing
HVAC labor is 260 dollars per hour, plus heater parts if the unit needs replacing. The range is a ballpark, confirmed in writing after inspection.

## FAQ
### What does the auxiliary coolant heater do on a Sprinter?
It is a factory booster that heats engine coolant so the cab warms and defrosts faster than the diesel can manage on its own. When it fails, warm-up and defrost slow down noticeably in cold weather.

### Is this the same as a cargo or living-space heater?
No. This is the factory cab coolant heater. A separate fuel-fired heater that warms a cargo or living space is an upfit service, which we handle under our upfit work rather than here.

### Why is my Sprinter slow to warm up and defrost?
Diesels throw off little spare heat at idle, and the auxiliary heater covers that gap. If it has failed, warm-up and defrost drag. We test the heater along with its fuel and controls to get it working again.