Car Repair World

I have no heat in my truck. Blows plenty of air but no hot air. I have changed the thermostat but this did not help. I cannot locate any valve on the heater lines going into the cab. Any ideas? There should be a  vacuum   controled  water valve on this truck it may be laying on the intake up by the front on the passenger side of the engine.(but GM did do away with this on some  vehicles  and just use the air blend door to keep the heat out of the cab). The first thing I would do is, touch each hose to see if they are both hot after warms up engine. The one come from the engine should be hot if the valve is open. If one is hot and the other is a little cooler or cold you may have a cloged heater core. If both are hot and you have no heat, then the air blend door may not be opening on the inside the heater box. This could be cause by many things. The actuator may be bad that pulls it open, something may have gotten inside the box and  penning the door and...

Troubleshooting Car Heater Not working Problem Helpful Information Related Car Repair Information: Sometimes engine coolant level can be low without the engine overheating, especially in winter conditions. A heater control valve can be actuated by either a vacuum line or control cable. To warm the passenger cabin, the heater system makes use of heat generated from the engine by blowing across the heater core and onward through the system ductwork. When a heater core develops a leak, there are usually two indications, steam could be produced from the vent system and is accompanied by a pungent odor, or the passenger floor can become wet from leaking coolant, these are signs the  core needs replacement . Step by step guide on how to fix an automotive heater, this information pertains to most vehicles. Difficulty Scale: 4 of 10 Tools and Supplies Needed Flashlight Screwdriver set Protective gloves and eyewear Begin with the vehicle on level ground, engine off ...

How To Replace Vehicle Heater Core Helpful Information The heater core is similar to the radiator located in the vehicle’s  cooling system . The blower motor forces air through the core and into the air duct system allowing temperature controls which enable defrost floor and front vent modes. The most common cause of heater core problems is neglect, cooling systems need to be serviced on a regular basis, coolant can become corrosive and will cause deterioration of the core. Use caution when installing the heater core, these units are made of thin metal and plastic and are easily broken. Use a digital camera/phone to take pictures during the disassembly process, this will aid in reassembly if things get complicated. The glove box will need to be removed in most cases to allow access. Some plenums have a small door, others will have to be disassembled to gain access to the heater core. Best Practices Always use a quality replacement heater core. Check the condition of...