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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

92 Chevy Cavalier, No Heat
Q: I have a '92 Chevy Cavalier. It doesn't give enough heat. When it is cold outside and the blower running at full speed, I can still feel cold inside and the part (in middle) of front windshield remains foggy. Somebody told me that this was due to a faulty thermostat so I had it replaced, the problem still exists. Please advise.

A: You have to answer these questions; 1. Is the coolant reaching proper operating temperature? 2. Is there adequate coolant flow through the heater core? 3. Is the heating/ventilation system (doors, flappers and controls) functioning properly? The thermostat which controls coolant temperature is most frequently the cause of poor heat from a vehicle's heating system. You already replaced the thermostat. (Hopefully with one that has the factory recommended operating temperature.) What about adequate coolant flow? It's not uncommon for heater cores to become internally restricted, reducing the heat available. A quick check for restriction can be performed by comparing the temperature of the coolant inlet hose to that of the outlet hose of the heater. If there is a remarkable difference in temperature between the hoses, then there is most likely a restriction. To confirm a restriction requires checking the coolant flow rate through the heater core. Sometimes a restricted heater core can be back flushed to clear it of the restriction. If that doesn't work the heater core must be replaced. By the way, the most common cause for heater core restriction is due to poor cooling system maintenance. The least frequent cause of poor heat is the heating/ventilation system (doors, flappers and controls). Many of the system components are made of plastic and do wear and break with age, resulting in the inability to control air temperature.

 
     
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