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Re: a/c shuts off at high rpm's in bronco
Your post may have been better titled as
"my air flow diverts from vents to defrost when engine accelerates or runs at higher rpm"
This is a typical vacuum leak in mode door vacuum line under hood scenario. Trace the black plastic vacuum line from firewall to vacuum reservoir to intake manifold - see if it is broken or cracked or deteriated- the cut out bad portion or add new.
The mode doors are spring loaded such that if there is a loss of vacuum (your case) that the air flow goes to defrost for safety - so as to not allow foggy windshields and inability to see where you are going.
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Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
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