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Problem with heater/vaccuum??
Hi All,
I have a 97 XLT with 4.0 SOHC. I have a problem when I move the heater into the defrost (upper vent) position. At idle, when in this position I hear a loud click and the engine bogs down to about 400 rpm then recovers. Three seconds later the cycle repeats. When the heat selecter is in the floor/defrost position the problem still exists, but it doesn't seem to bog down so badly. Any suggestions on what might be causing this? FWIW, I do have the infamous blend door problem. Thanks for any input you can offer. |
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#3
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Problem with heater/vaccuum??
Cycling frequently is usually because low on Freon
As for engine bogging down, slow responding and/or dirty IAC valve ??? "Justa Me" > wrote in message news:Ews1h.75295$E67.26584@clgrps13... > Hi Alan, > > Thanks for the reply. Should the compressor be kicking in and out so much > (every three seconds)? It seems somewhat excessive. > > > <Alan > wrote in message > ... >> On Mon, 30 Oct 2006 16:42:54 GMT, "Justa Me" > wrote: >> >>>Hi All, >>> >>>I have a 97 XLT with 4.0 SOHC. I have a problem when I move the heater >>>into >>>the defrost (upper vent) position. At idle, when in this position I hear >>>a >>>loud click and the engine bogs down to about 400 rpm then recovers. >>>Three >>>seconds later the cycle repeats. When the heat selecter is in the >>>floor/defrost position the problem still exists, but it doesn't seem to >>>bog >>>down so badly. >>> >>>Any suggestions on what might be causing this? FWIW, I do have the >>>infamous >>>blend door problem. >>> >>>Thanks for any input you can offer. >>> >> The AC is enabled in any positions that include the defrost vents, >> and I would guess that's what you're hearing -- the compressor >> kicking in and out. >> >> Why the engine is bogging down so much? Don't know. >> >> Perhaps the infamous MAF (Mass Air Flow) sensor in the air intake is >> acting up and screwing up the engine management system. That >> happens. >> >> Alan Moorman >> > > |
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