Buy Now | Log In | ALLDATA Corporate Site |
Back To Home Page
Log In To Your Subscription
Go To ALLDATA Back Home
Buy A Subscription! Back Home About ALLDATA Information View Sample Vehicles Read Testimonials View Factory Service Bulletins and Recall Titles Contact Us
Dowload Our Navigation Chart
February 2015: New vehicles added including 2014 GM.
• View New Vehicles
October 2014: Release of 2013 along with initial 2014 Vehicles
• View Vehicles
View All News and Updates:
• Go To News
Tech Tips
  Read All Tech Tips

ALLDATA Tech Articles Are Updated Weekly
• View All Tech Articles

  Dodge Durango: Brake Pulsation Problems In Paul's Durango
• Read Dodge Article
Fixing A Smelly Audi Audi Tech Tip: A4 begins to Smell caused by a Faulty Hose Composition
• Read Audi Article
Why Do You Need To Change Your Timing Belt? Why Replace Your Timing Belt
• Read Belt Article
Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
Home >> Featured Tech Articles >> Go Back
  Jim Grant's Tech TipsJim Grant's Tech Tips
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 users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  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.

Have any Questions About Please Email Us
Buy Now | Log In | About | Sample Vehicles | Testimonials | Join Affiliate Program