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Usual Signs of a Bad GMC Sonoma Radiator

Your radiator plays an important role in maintaining the temperature of your engine. Because of the rugged activities of your pickup truck, its engine is very likely to overwork. With this, you should take good care of your engine cooling system. This includes your radiator. It keeps your engine from overheating by cooling down the coolant that circulates around your engine block. Common issues with your GMC Sonoma radiator include rust, leak, and clog. Following are the signs that your pickup's radiator is going bad.

Low coolant levels

When the coolant levels are often low in your pickup truck, there is a leak somewhere in your radiator. Your radiator is composed of fins for effective heat exchange between the coolant and the air that blows against your radiator. Low coolant levels come with a visible leak on the body of your radiator as well as coolant on the ground. To be certain of a radiator leak, you can have your radiator pressure-tested at a motor shop.

Discolored coolant

When the coolant inside your radiator begins to change color into something oil- or rust-like, your radiator has a clogged fin. Some less expensive coolant products leave small particle deposits that clog up the passageways inside your radiator. The blockage can cause your radiator to go bad, so it should be flushed immediately. In a severe case of clog, the radiator should be replaced.

Cool radiator portion

If one portion of your radiator is relatively cooler than the other parts, there may be a clog in its internal tubes. The transferring of heat from the coolant to the radiator should take place in all parts of your radiator. When one portion is cooler, it means that there is little or no coolant flowing through that part. This issue can be remedied through a radiator flush. However, often flushing can damage your radiator. In that case, the radiator should be replaced instead.

Blown head gasket

This is a later and more serious sign of a bad GMC Sonoma radiator. Your bad radiator has already caused your engine to overheat, blowing out one or two of its head gaskets. This is a serious issue because the leaking gasket can introduce contaminants that damage the engine. With this, the damaged head gasket and the radiator should be replaced immediately.