No Heat
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
start by grabbing both hoses going to the heater core and feel for heat not sure if yours has a shut off valve.
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
On the RH side of the firewall there are two hoses connected to some metal tubes running towards the front of the engine. In the middle of the tubes there is a valve that is vacuum controlled. Check for movement here as this valve allows heated water to enter your heater core. There are also vacuum operated doors under your dash that divert air flow over your heater core. It is possible that your heater core was leaking and a PO disconnected it by rerouting the rubber hoses from your intake to the water pump. If any of that is missing, thats where I would start.
Thread Starter
5th Gear
Joined: Oct 2015
Posts: 5
Likes: 0
On the RH side of the firewall there are two hoses connected to some metal tubes running towards the front of the engine. In the middle of the tubes there is a valve that is vacuum controlled. Check for movement here as this valve allows heated water to enter your heater core. There are also vacuum operated doors under your dash that divert air flow over your heater core. It is possible that your heater core was leaking and a PO disconnected it by rerouting the rubber hoses from your intake to the water pump. If any of that is missing, thats where I would start.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
On the RH side of the firewall there are two hoses connected to some metal tubes running towards the front of the engine. In the middle of the tubes there is a valve that is vacuum controlled. Check for movement here as this valve allows heated water to enter your heater core.
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Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
You may be right Cliff. I just assume the pre '92 L98 set ups are the same as my '85. No I dont have any pics but IF you have this valve its mounted to the RH wheel well. The whole set up is about 18" long and has 2 metal tubes with rubber hoses connected to it.
Thread Starter
5th Gear
Joined: Oct 2015
Posts: 5
Likes: 0
I do have the metal tubes