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Ask Ron Your Own Question
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23001
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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A/c is blowing thru defroster, vacuum pump is running but

Customer Question

a/c is blowing thru defroster, vacuum pump is running but there is a small tip at side of pump with no hose on it and it is pulling air in , trying to find out if this is a fail safe for the pump, I have manual locking hubs, 2000 f350
JA: Do the vents feel cold? Is there a coolant leak?
Customer: yes cold air, no leaks, vacuum pump is vibrating never heard it before
JA: What is the model of your '00 Ford?
Customer: 2000 , f350 S-Duty, 7.3 diesel
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: yes , I will fix my self, just trouble shooting , just happened friday
JA: Anything else you think the mechanic should know?
Customer: the vacuum tank had a small hole in it long time ago, I put some epoxy on it and it has been working , checked it too, no leaks
Submitted: 2 months ago.
Category: Ford
Expert:  Chad Farhat replied 2 months ago.

Hi, I'm Chad ,Welcome To JustAnswer, I'm reviewing your question and I will be be posting a replay ASAP

Expert:  Chad Farhat replied 2 months ago.

where that vacuum hose go to, if vacuum line is off or leaking, you will have erratic air vent flow

Expert:  Chad Farhat replied 2 months ago.

send me a picture if you can .

what is the problem you having a/c air flow defrost not middle vents correct ?

Please let me know

Thank You

Chad Farhat

ASE Certified Technician1