1999 Ford Expedition Thermostat changed, now check engine l

Tiny
MARC1973
  • MEMBER
  • 1999 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
Hi,
My truck recently stopped blowing out any heat. Blower blows fine, but not enough heat. Brought it to a local shop and they replaced the thermostat. Picked up the truck and bearly any heat and truck runs rough. Check engine light came on half way home. Brought it right back to shop and they said that it takes the thermostat awhile to "open" up and that I probably need new spark plugs. Truck ran smoothly when I brought it in. Spark plugs were changed at approx. 90,000 miles. Could the shop have disrupted anything or caused the truck to misfire and engine light to come on. Computer check said something about cylinder #7 misfire, but something seems weird. Please advise.
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Tuesday, January 1st, 2008 AT 11:59 AM

2 Replies

Tiny
KHUMMS518
  • MEMBER
  • 2 POSTS
Your truck probably needs a temp blend door and motor for heat and a # 7 coil for misfire
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Tuesday, January 1st, 2008 AT 8:35 PM
Tiny
MARC1973
  • MEMBER
  • 2 POSTS
Brought the truck back to the shop and now they are saying "yeah, it's the heater core. You're getting heat in the rear and it's gonna take us at least 6 hours to fix it". What the? Why didn't they tell me that before. First it was the thermostat needs to open up, takes a couple of times. Now it's the heater core without even looking at it today.

I had a small amount of heat before the thermostat was replaced, only on the first and second setting. Still the same amount now. Blower still works fine. Air-cond. Works great. No smells. No obvious leaking in the truck or on the ground. Hose to radiator is warm.

Engine light is still on. When I asked about changing to a different cyclinder and then checking the computer diagnostics, they said "oh, yeah, well, uh, yeah, I guess we could do that".

What's next? Told them I would call them later.
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Wednesday, January 2nd, 2008 AT 11:33 AM

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