The Volvo Parts, Accessories &
Performance Specialists Since 1963

Pre-Heat Hose

Aftermarket 3378 - 105054

Sale Price:$11.79
In Stock
Item Number
Mfr Part Number
Brand Classification
Units Per Car
One Year Parts Warranty
Product Group
Repair & maintenance
OE References
Genuine Volvo - 946841

Product Description


This aluminum flex hose often gets torn and ends up hanging from the left side of the engine compartment. The purpose of this hose, when hooked to the heat riser pipe on the exhaust, is to route warm air to the air filter box.

When the ambient temperature is below about 40°F, hot air will be pulled in to the engine from around the hot exhaust manifold.  This is meant to help warm the engine up faster which reduces emissions.  It should also help prevent throttle valve icing.  A car with a broken preheat hose may fail emission testing or state inspection.

When replacing this hose, you might also check the air filter box thermostat.  This thermostat regulates the temperature of the air entering the engine intake system.  Failure of this thermostat can cause Mass Air Flow sensor (MAF/AMS)  failure.  MAF sensors won't survive long under the extreme unregulated heat from the exhaust manifold.

About Aftermarket

At IPD, we have a basket of trusted "Aftermarket" brands we pull from for fast-moving items, so we're able to get customers the right part for the job from any available source. Our Aftermarket brand umbrella covers many brands you're familiar with, like: APA ÜRO, CRP, Rein, TYC, Professional Parts Sweden, MTC, Fel-Pro, FAE, KAE-Kaehler, Fram, ProTech, Nissens, Standard Ignition Products, Centric, Beck/Arnley, and more!

We pick brands with a balance of good quality and good value; we trust these brands on our own cars, and we hope you will too!

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