2001 Ford Windstar Blows hot then cold

2001 FORD WINDSTAR
130,000 MILES • 6 CYL • FWD • AUTOMATIC
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MARK LUKAS
  • MEMBER
  • 1 POST
Greetings,

My 2001 Windstar just started this thing where as long as you have your foot on the gas driving the heater works great, come to a red light, and bam instantly blows cold air. Start driving again, gets hot again. Put it in park, goes cold instantly. I know with the old muscle cars I build you'd just change the thermostat and it's fixed, does the same hold true with these newer vehicles? Or is there something else wrong? Thanks for your help.
Nov 9, 2008 at 4:10 PM
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DAVE H
  • CAR REPAIR CONTRIBUTOR
  • 13,384 POSTS
BASIC HEATER SYSTEM TROUBLE SHOOTING CHART

Insufficient, Erratic, or No Heat

POSSIBLE CAUSE
.....Low Coolant Level
.....Incorrect thermostat.
.....Restricted coolant flow through core.
.....Heater hoses plugged.
.....Misadjusted control cable.
.....Sticking heater control valve.
.....Vacuum hose leaking.
.....Vacuum hose blocked.
.....Vacuum motors inoperative.
.....Blocked air inlet.
.....Inoperative heater blower motor.
.....Oil residue on heater core fins.
.....Dirt on heater core fins
Dec 20, 2016 at 6:25 PM
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ANDYVS
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  • 1 POST
Did you find out the answer? I'm thinking vacuum but I know the hot/cold control is electric. Possibly a vacuum signal controling that though.

I need to fix it soon!

Thanks
Dec 20, 2016 at 6:25 PM