Diagnosis Brief
what this complaint usually turns out to be
what this complaint usually turns out to be
Car Heater Not Working — What It Usually Is
How real visits for no heat ended at independent shops across the US — the part actually replaced, how often, and what it cost when it was the only fix.
Thermostat or blower motor
About a third of all these visits end in one of these two
Thermostat $165 – $408
Blower motor $185 – $435
typical cost when it was the only fix
(parts + labor)
(parts + labor)
| The fix involved | Share of these visits* | Typical cost† | Median |
|---|---|---|---|
| Thermostat | $165 – $408 | $262 | |
| Blower motor | $185 – $435 | $287 | |
| Module / actuator | $254 – $696 | $413 | |
| Radiator | $189 – $624 | $401 | |
| Water pump | $261 – $651 | $394 | |
| Heater core / component | $141 – $541 | $279 | |
| Hose | $103 – $387 | $207 | |
| Switch | $126 – $344 | $216 | |
| Radiator hose | $130 – $386 | $234 | |
| Other, rarer causes | smaller shares — blower resistors, heater cores, thermostats, coolant level | varies | — |
*Share of visits whose repair involved this part; combined repairs count toward each part, so shares overlap and don't add to 100%. †Middle half of real invoices when this was the only fix — parts + labor, all vehicle types.
Which one is yours? Listen first
- Lukewarm at best — An engine that never fully warms — often with the temp gauge reading low — is a thermostat stuck open.
- Heat fades at idle — Warm on the highway but cool at stoplights is the low-coolant signature: the heater core sits high and starves first.
- One side hot, one side cold — Split temperatures on dual-zone systems are usually a blend-door actuator — a small motor behind the dash, more labor than parts.
What to expect from the shop
No heat splits into no airflow (blower motor or resistor) and no warm air (low coolant, thermostat, a blocked heater core or a stuck blend door). Expect the shop to check coolant level first — it's the cheapest cause. A heater core is the expensive tail, mostly for the dash work to reach it.
About this data · How to use this brief
Vehicles all makes and models, US fleet
Data confidence High — large sample, stable shares
Records through July 2026, refreshed continuously
Source paid invoices from independent US repair shops
Data confidence High — large sample, stable shares
Records through July 2026, refreshed continuously
Source paid invoices from independent US repair shops
Take it to the shop. It tells you what the likely answers are and what each one should cost — so when the diagnosis comes back, you already know whether the number fits. Vehicle-specific price reports for the common fixes are on fixdozer.com.