Automobile Radiator Repairing
Napa Valley, San Francisco North Bay, Ca. USA

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Radiators and convectors are types of heat

 exchangers designed to transfer thermal energy from one medium to another for the purpose of cooling and heating. Majority of the radiators are constructed to function in automobiles, buildings, and electronics.

In automobiles, with a liquid-cooled internal combustion engine, a radiator is connected to channels running through the engine and cylinder head, through which is pumped a liquid (coolant). This liquid is typically a mixture of water with antifreeze and a little corrosion inhibitor.

A system of valves or baffles, or both, is usually incorporated to simultaneously operate a small radiator inside the car. This small radiator, and the associated blower fan, is called the heater core and serves to warm the cabin interior. (Heating the interior of the car also helps to cool the engine, this is the reason for the mechanic's instruction to turn on the heating system if the car is overheating.)


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Alphabetical Listings

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Cook's Radiator Svc
1984 Broadway St, Vallejo, CA 707 642-1260

Gene's Auto Repair
37 Tennessee St, Vallejo, CA 707 642-1900

Jiffy Lube
605 Lincoln Ave, Napa, CA 707 254-9934

Mobile Radiator Svc
Vallejo, CA 707 643-7434

Ray's Radiator & Glass
360 Mccormick St, St Helena, CA 707 963-5223
  Temperature control

The engine temperature is controlled by the thermostat, a wax-pellet type temperature operated valve. When the engine is cold the thermostat is closed. Coolant bypasses back to the inlet of the circulating pump and is returned directly to the engine. Directing water to circulate only through the engine, and the heater core, allows heat to build up in the engine. When the coolant reaches the thermostat's activation temperature it begins to open, allowing water into the radiator. The thermostat will open as far as needed to maintain the design temperature by metering the amount of water going to the radiator.

How far the thermostat opens depends on many factors such as engine power demand, heat produced, the air flow through the radiator, outside air temperature and cleanliness of the radiator itself. The basic process is entirely mechanical, the only electrically controlled part is the electric cooling fan. Some, mostly older, cars do not use an electric fan but one driven by the engine directly, or via a fan clutch or a simple fluid coupling, as part of the water-pump drive from the crankshaft pulley.

The size of the radiator is usually chosen so that it can keep the engine at the design temperature under the most extreme conditions a vehicle is likely to encounter (such as climbing a mountain while fully loaded on a hot day).
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