heater problem with heater control valve vacuum line


Asked by May 16, 2016 at 04:56 PM about the 2001 Ford Explorer Sport Trac 4WD Crew Cab

Question type: Maintenance & Repair

ok, here is the history
replaced water pump
replaced thermostat
put it back together and no heat.

Noticed I'm not getting any vacuum to the heater control valve (HCV).
flushed the heater core, and put it back together. Had vacuum and heat for
about 5 minutes. then HCV opened (no vacuum) and no more heat.  

Read some other replies here, and seems to be some experienced Ford
fans. Help.

5 Answers


AS you know...Most Ford explores have a vacuum operated valve in the heater line to the heater. It is located on the passenger side near the back of the engine in one of the heater lines. You should be able to move valve with your hand. Once engine is up to temperature, feel both sides of heater hose before and after valve. it should be hot on both sides if water is flowing. If not move valve and see if it gets hot on both sides. If that it is the problem, just prop valve open until you can replace it. NEXT...I would also check your BLEND door , Fords are known for BLEND DOOR issues


You have air in the heating system. WITH THE ENGINE COLD... Take the coolant resvoir cap off. Turn the engine on. Let it get hot by touching the upper radiator hose. If its hot the thermostat is open. Grab a shop rag and carefully squeeze the upper raidiator hose until you dont here bubbles or gulps coming from the coolant resevoir. This will bleed the air out. Every so often get in and rev the engine to get the water pump to circulate the coolant and air throughout the system while your doing that turn the heat on and place your hand by vent to feel the hear. When you grab the upper hose bubbles should come from the resvoir. Remember once the resivor cap is off its vented to the atmosphere so its not going to overheat or hurt you but DO NOT TAKE THE CAP OFF THE RADIATOR JUST THE RESIVOR.


I agree the cooling system may need to be bled from air,


thank you.


will give it a try.

Your Answer

Add photo

Related Questions

Explorer Sport Trac

Looking for a Used Explorer Sport Trac in your area?

CarGurus has 2,255 nationwide Explorer Sport Trac listings starting at $1,995.


Search Ford Explorer Sport Trac Questions

Ford Explorer Sport Trac Experts

#1 Wayne Foy
Wayne Foy
Reputation 860
#2 Tracy Hooks
Tracy Hooks
Reputation 390
#3 tenspeed
Reputation 320
View All

Related Models For Sale

Used Ford F-150"
3,167 Great Deals out of 215,797 listings starting at $1,000
Used Ford Explorer"
1,328 Great Deals out of 71,180 listings starting at $985
Used Nissan Frontier"
462 Great Deals out of 20,640 listings starting at $2,500
Used Toyota Tacoma"
613 Great Deals out of 30,000 listings starting at $2,850
Used Ford Ranger"
254 Great Deals out of 7,808 listings starting at $988
Used Ford Explorer Sport"
330 listings starting at $995
Used Dodge Dakota"
151 Great Deals out of 4,812 listings starting at $900
Used Dodge Ram 1500"
537 Great Deals out of 13,899 listings starting at $995
Used Chevrolet Silverado 1500"
2,371 Great Deals out of 143,343 listings starting at $1,195
Used Chevrolet Avalanche"
243 Great Deals out of 6,253 listings starting at $2,500
Used Toyota Tundra"
640 Great Deals out of 26,381 listings starting at $2,500
Used Ford Mustang"
724 Great Deals out of 41,220 listings starting at $900
Used Ford Expedition"
583 Great Deals out of 21,300 listings starting at $2,111

Used Cars For Sale

2010 Ford Explorer Sport Trac For Sale
9 Great Deals out of 166 listings starting at $9,999
2009 Ford Explorer Sport Trac For Sale
67 listings starting at $8,000
2008 Ford Explorer Sport Trac For Sale
10 Great Deals out of 239 listings starting at $6,840
2007 Ford Explorer Sport Trac For Sale
24 Great Deals out of 545 listings starting at $6,000
2005 Ford Explorer Sport Trac For Sale
8 Great Deals out of 331 listings starting at $4,490