1999 Ford Explorer check engine code for air blowing thru d

SEANSTRAUSITY

MEMBER
1999 FORD EXPLORER
6 CYL
2WD
AUTOMATIC
186,400 MILES

Air conditioner blows cold, but blows thru the defroster vents up by the windshield & when I turn it on, it throws a code to "check engine". Code relates to the air conditioner.

Friday, October 15th, 2010 AT 10:04 AM

7 Replies

JACOBANDNICKOLAS

MECHANIC
109,645 POSTS

You are dealing with a vacuum leak in this case. The vent doors that direct air flow are vacuum actuated. Check under the dash for damaged or disconnected hoses. If you are lucky, you may hear a hissing sound with the engine running.

Let me know what you find.

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Friday, October 15th, 2010 AT 11:23 PM

SEANSTRAUSITY

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4 POSTS

Thanks bro i'll check it out.I already checked all the fuses. So i'll check for a vacuume leak, i'll let u know.

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Saturday, October 16th, 2010 AT 11:58 AM

JACOBANDNICKOLAS

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109,645 POSTS

Let me know. The vent doors won't set a check engine light.

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Saturday, October 16th, 2010 AT 10:19 PM

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Ya, i've been told by several ppl its a vacume leak. The problem is there are manyl places that cud be leaking.I havent found any broken or disconnected spegettii hosses.

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Sunday, October 17th, 2010 AT 11:19 AM

JACOBANDNICKOLAS

MECHANIC
109,645 POSTS

They are a pain in the & % to find. If you can stand the smell and can be really careful, take some starter fluid and spray it around the hoses. If there is a leak, it will cause the engine to rev-up. That is if the hose is still connected to the engine. However, please remember, keep the doors open for fresh air to you, and starting fluid is extremely flamable. Keep it away from anything that is extremely hot or could cause a spark.