[V8] 1990 heater core experience needed

bkrussow at comcast.net bkrussow at comcast.net
Fri Oct 10 05:27:09 PDT 2014


I think you have already diagnosed the problem. You are losing antifreeze from HVAC box drain tube. The only thing in there with antifreeze in it is the heater core, I replaced a heater core on my 5000 and 4 years later it was leaking. You said it was a loose fit which tells me that core has been vibrating in there all these miles. 
Bob 
----- Original Message -----

From: "patrick gillen" <pat_gillen at msn.com> 
To: "V8 List" <v8 at audifans.com> 
Sent: Thursday, October 9, 2014 11:01:34 PM 
Subject: [V8] 1990 heater core experience needed 

Hello all: 

I have been losing coolant and discovered it is coming out the drain hose 
from the AC housing. At first I thought normal condensate, but in a jar it 
is a light blue-green same as well diluted antifreeze. 

The bottom of the fan suction duct connecting the AC housing to the fan is 
dry. The heater core is dry at the left end where the hoses connect. The 
core is a loose fit in the housing (previous owner had dealer replace core 
at 99k miles and they must have left the sealant out; miles now are at 
170k). Interior of car is dry. It is hard to believe a pinhole core leak is 
humidifying the cabin only to condense on the evaporator on recirculation 
and out the drain but I am at a loss for any other explanation. 

Is there anyone here that had a fan/heater out that can understand how a 
heater core coolant leak could be coming out the AC coil drain hose? 

Is there a hose buried under the dash from the heater core housing that goes 
to the AC housing drain hose to the bottom of car? I see nothing from above 
and below is impossible. Etka doesn't show a heater core area drain hose, 
and the fiche is of no help. 

The pain of removing the heater hoses in just several cc's of available 
space to get the heater out and maybe finding the core is dry has me ready 
to go to plan B with the Portland OR car. 

Thanks, 

Pat Gillen 



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