North American Turbocoupe Organization



88 A/C Issue Question?
LorainO88 Offline
Member
#1
And away we go....My 88 TC is having air issues. The A/C-remarkably works just fine. It blows colder air than a new one. About 1 month ago I noticed the air would shut off from blowing out the dash vents and start blowing out of the defrost vents when it was time to shift the gear from 1-2-3-4-5. Odd. When I release the clutch pedal, the air switches back to the dash vents and continues to cool the car. This repeats again once I stop and take off again in all gear patterns. Any ideas or advice. I've got a local mechanic looking at it tomorrow. Hopefully, it is nothing major. Thank you everyone for your advice.
WRBjr
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Pete D Offline
Administrator
#2
If you have the manual system the directional doors are controlled by vacuum. You may have a vac leak within the system.
Pete Dunham


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LorainO88 Offline
Member
#3
Thank you Pete D. Yes it is manual. I wish it were the auto system. I guess at this point I time I should be glad it is not. That makes me feel better regarding it possibly being just a vacuum hose. Seems like every time I turn around something new pops up. I don't mind this car is worth it! Thanks again!
WRBjr
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Jeff K Offline
Administrator
#4
There is a vacuum reservoir in the pass side fender, that, along with a one way check valve, stores vacuum for the mode vacuum motors during conditions of low vacuum. Defrost is the default condition when no vac is supplied to the vacuum motors. Your HVAC system is losing vacuum. The vac reservoir in the pass side fender can crack, the vac hose can fall off, the one way check valve can fail, etc.

Follow the vac hose from the vac tree port labeled AC across the top of the firewall to the check valve / T fitting on the pass side. One hose from the check valve / T goes thru the firewall to operate the mode vac motors. the other line goes into the pass side fender near the hood hinge to the vac reservoir. Pull this line off the T / check valve and apply vacuum. It should hold vac for a long time if the reservoir is good.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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LorainO88 Offline
Member
#5
Thank you! You are gonna love this one. Turns out after 2 trips to the shop....Here was the problem. Seems a rat had found itself a winter home inside the passenger side fender. We both know what is located there. Yep. Chewed the hose to the vac reservoir to bits. And $250 later all is fixed. Thanks.
WRBjr
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Jeff K Offline
Administrator
#6
Should have pulled the pass side inner fender and fixed it yourself for free.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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LorainO88 Offline
Member
#7
Ha. I completely agree. Time. Time. Time. My code reader and extension cord arrived today. I'm looking for repair manuals at this writing. I have spent half as much as I bought her for a year ago to replace things that were all still original from production. A true barn find. No mods. All stock. Took 28 years to get here. Gotta keep this TREASURE rolling. Thank you all for advice.
WRBjr
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boboli Offline
Member
#8
Be glad you have manual control. I wish I did. My auto HVAC seems to have a mind of it own at times and switches between hot and cold for no reason.
1988 turbo tbird, 5spd, 140k, all stock except boost control valve.
1986 dodge omni glh turbo, 111k, my money pit.
1989 mustang Lx 5.0 convertible, tropical yellow/ tan interior, 1of only 144 made, 164k, aod, all stock including overheating TFI!
89 Jaguar XJS convertible, LT1 conversion, now fighting the prince of darkness (aka Lucas electronics)
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LorainO88 Offline
Member
#9
I do. I remember test driving a dealer used 87 Black TC in about 89 with the darkest tinted windows I had ever seen in my 19 year old life! I was completely mesmerized by the ACC itself. I am beginning to believe each and every TC has a mind of its own.
WRBjr
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