[WuNgUnSVT]

OAC_Sparky,Nov 21 2008, 03:24 PM Wrote:

hardk0re,Nov 21 2008, 02:06 PM Wrote:But when i'm driving I get good heat?  Could a vac hose cause that?
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If it's a vacuum actuated system, yes; because the vacuum pressure changes as you drive.
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The only thing vac operated on an '02 is the flapper door to recirculate...

I'd check your coolant level. I'll almost guarantee that's what it is...
The t-stat likes to start leaking once it gets cold out, and once your coolant level drops so low, you won't get heat until the pump RPM can force it thru the heater core...