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Nissan 240Sx HVAC Heater and HVAC Delay Relays

Nissan 240Sx Hvac heater and hvac delay relays

Starting at $23.95, AutoBuffy stocks 1 HVAC heater and HVAC delay relays from Standard Ignition for the Nissan 240Sx. These relays control when the blower motor receives power and regulate timed functions like post-ignition cabin heating. A failed relay means no heat, no airflow, or a blower that won't shut off — leaving you with a cold cab or a drained battery.

Signs your Nissan 240Sx needs a new HVAC heater or delay relay

  • Blower motor does not turn on at any fan speed despite the controls being set correctly
  • Heater or blower continues running after the ignition is switched off, suggesting the delay relay is stuck closed
  • Cabin heat or airflow cuts out intermittently, especially after the vehicle reaches operating temperature
  • Only certain fan speeds work while others are completely dead — often a sign the relay is partially failing
  • Clicking or chattering noise from the relay box under the dash or in the engine-bay fuse block
  • Blown fuse on the HVAC circuit that returns as soon as a new fuse is installed, pointing to a shorted relay coil

Which HVAC heater or delay relay should you buy for your Nissan 240Sx?

The Nissan 240Sx may use a standard heater relay, a timed delay relay, or both — check your owner's manual or fuse-box diagram before ordering. OEM-equivalent relays must match the coil voltage, contact rating, and pin layout of the original; using an undersized relay can overheat and fail quickly. Brand reputation and warranty length are the most meaningful differentiators at this price point.

OEM-equivalent (direct-fit)
Best for
Owners who want a plug-and-play replacement with no modifications
What you get
Exact pin configuration, correct coil resistance, and validated contact rating for the Nissan 240Sx
OEM-equivalent delay relay (timed)
Best for
Replacing the post-ignition blower run-on relay specifically
What you get
Built-in RC or electronic timer circuit that replicates the factory cool-down or warm-up delay cycle
Premium / heavy-duty relay
Best for
High-mileage vehicles or those in extreme climates
What you get
Reinforced contacts rated for higher amperage, better vibration resistance, and longer rated cycle life
Universal relay with adapter pigtail
Best for
Budget-focused repairs when a direct-fit SKU is unavailable
What you get
Lower upfront cost, but requires confirming coil voltage and pin mapping; may need a wiring adapter

Hvac heater and hvac delay relays brands we stock for your Nissan 240Sx

Standard Ignition
1 option · from $23.95

Replacing the HVAC heater and delay relay on a Nissan 240Sx

Easy⏱ 30–60 minutesFuse-puller or needle-nose pliersFlathead screwdriverMultimeter (for confirming relay function before and after)Trim-panel removal tool (if relay is inside the cabin fuse block)

Locate the correct relay using the fuse-box diagram, then pull the old relay straight out — most snap in without fasteners. Seat the new relay firmly until it clicks into place, ensuring all pins are fully engaged. Restore power and test the blower at multiple speeds and delay functions before reassembling any trim panels.

Frequently asked questions

How much does it cost to replace HVAC heater and delay relays on a Nissan 240Sx?
Parts start at $23.95 on AutoBuffy. The relay itself is inexpensive, and most owners can replace it in under an hour using basic hand tools, keeping total cost low. A shop may charge one to two hours of labor on top of the part price if the relay is buried behind trim or in a secondary fuse block.
What is the difference between a heater relay and a delay relay on a Nissan 240Sx?
A heater relay is a simple on/off switch that supplies power to the blower motor circuit when you activate the HVAC controls. A delay relay adds a timer — it keeps the blower running for a set period after the ignition is off to finish a heat or cool-down cycle, or delays blower startup until the engine warms up.
Can a bad HVAC relay drain the battery on a Nissan 240Sx?
Yes. A delay relay stuck in the closed position keeps the blower motor running continuously after shutdown. Because the blower draws significant amperage, even a few hours of unintended operation can fully drain the battery. If you return to a dead battery and the blower was running, suspect the delay relay first.
How do I know which relay is the HVAC heater or delay relay on a Nissan 240Sx?
Check the fuse and relay box diagram printed on the underside of the fuse-box cover or in the owner's manual — relays are labeled by function. If the diagram is missing, a repair manual or the vehicle-specific fitment data on the AutoBuffy product page will identify the correct relay position and part number for the Nissan 240Sx.
Is it safe to drive a Nissan 240Sx with a failed HVAC heater relay?
The vehicle is mechanically safe to drive in mild weather, but a non-functional heater relay means no cabin heat or defrost airflow in cold conditions, which is a visibility and comfort hazard. A stuck-closed delay relay risks battery drain if left parked. Replacing the relay promptly is low-cost and keeps climate and safety systems working correctly.
Do I need to program or reset anything after replacing the HVAC relay on a Nissan 240Sx?
In most cases, no programming is required — the relay is a passive electromechanical component. Some vehicles with automatic climate control may briefly display a fault code after the relay circuit loses power; if a warning light remains after replacement, a simple ignition cycle or a scan-tool code clear is typically all that is needed.

Shop hvac heater and hvac delay relays by year for the Nissan 240Sx

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