No Heater
Thread Starter
Junior Member
Joined: Sep 2010
Posts: 23
Likes: 0
From: Campbell, TX
Car: 92 Z28
Engine: TPI 305
Transmission: WC T5
Axle/Gears: 10 Bolt (308's)
No Heater
Ok so the blower motor works, but the heater is not. Its all hooked up but I can hear like a hissing sound coming from the control unit. What could this be?
Thread Starter
Junior Member
Joined: Sep 2010
Posts: 23
Likes: 0
From: Campbell, TX
Car: 92 Z28
Engine: TPI 305
Transmission: WC T5
Axle/Gears: 10 Bolt (308's)
Supreme Member
Joined: Sep 2002
Posts: 9,192
Likes: 19
From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: No Heater
If you have a vacuum leak, then several things could be happening to reduce heat
1) flapper door to the heater core not opening
2) heater diverter valve under hood not opening
3) all air blowing out the defroster vents
1) flapper door to the heater core not opening
2) heater diverter valve under hood not opening
3) all air blowing out the defroster vents
Supreme Member
iTrader: (8)
Joined: Jul 2001
Posts: 3,204
Likes: 7
From: New Boston, IL, USA
Car: '90 Formula 350
Engine: 383 SBC
Transmission: ProBuilt S/S 700-R4 & ACT 9" Stall
Axle/Gears: 10 bolt 3.23
Re: No Heater
I'd say check the back of the control unit for a vacuum leak like mentioned. I remember the rubber connector coming loose on me once.
With the unit switched to heat and the car warmed up you should be able to feel both lines going into the heater core on the passenger side of the car under the hood. Both should be warm/hot if the diverter valve is working correctly.
With the unit switched to heat and the car warmed up you should be able to feel both lines going into the heater core on the passenger side of the car under the hood. Both should be warm/hot if the diverter valve is working correctly.
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