Heater Problems

**Justin M** · #1 (**permalink**) 10-27-2008, 06:31 PM

My heater in my truck works sometimes and sometimes it doesnt. The truck is warm enough. Sometimes when i am drivin it is hot as heck and when i stop it gets ice cold. I can hear it change from A/C to heater just not the temperature...whats up with it?

**SCUFFY828** · #2 (**permalink**) 10-27-2008, 06:34 PM

possible vacuum leak to blend door , on that model there is a white vacuum line on passnger side in front of heater box , its bad to dryrot and crack and cause a vacuum leak

**Justin M** · #3 (**permalink**) 10-27-2008, 06:40 PM

allowing it to work sometime and not sometimes

**SCUFFY828** · #4 (**permalink**) 10-27-2008, 06:51 PM

possibly yes , just a starting point , no heaer control valve , all dash components are vacuum operated for heat or cold , so id start checking for a vacuum leak

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