Re: 2000 F250 A/C Question

Posted by Bob on May 28, 2011 at 21:37:16 from (64.255.159.192):

In Reply to: 2000 F250 A/C Question posted by Howard H. on May 28, 2011 at 20:18:24:

I know NOTHING specific about your truck, but it IS common for some systems to simply use a "blend door" to route the airstream away from the heater core when heat is not desired with NO need for a water shutoff valve.

Then, I went to the Rock Auto parts lookup website and they DO list a vacuum operated water valve for a 2000 F250 (I looked it up as the 5.4 gas engine, specifically).

Have you had a look to see if there's a valve in one of the heater hoses? Then, check the vacuum line to it for damage and connect a vacuum gauge to the line and look for a change of state (vacuum/no vacuum)as the temperature control is moved between hot and cold.

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