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R-12 auto A/C tech in chit chat

It may ice when you get off idle and get air flow. Take your cans and gauges for the first trip. Adjust as needed.
 
When I had the bypass for the heater - no core, just a hose direct from the outlet at the rear of the intake to the return at the rad - motor was running at 190 to 200. 200 or more in traffic, cooled down some when moving. Could sometimes see 230 at idle (all of this is with the A/C on). Once left the motor running at idle with the A/C on for the dog. Saw 270! 180 known good thermostat.

Now that I closed off the bypass circuit, it's running at 150. With the A/C on. In Texas heat. Same everything.

I don't understand.
 
Your heater core was more restrictive than simply bypassing it thus more coolant flow was going thru the radiator
 
1oddtech said:
Your heater core was more restrictive than simply bypassing it thus more coolant flow was going thru the radiator
Click to expand...
There hasn't been a heater core since I put it back together because the plenum is still not installed. Evaporator core just there in the open.

At first I ran a heater hose from the intake to the rad. Straight shot. That resulted in the hotter running.

Now that circuit is blocked off. And experiencing the cooler running.

I still don't understand it - the running cooler part of it. The running hotter the first way makes sense.
 
Sigh

I explained why you were over heating bypassing the heater core and are not overheating when you blocked the flow. If you don't understand that please put the tools down and get some one who knows what they are doing to finish repairing your truck, you obviously can't do it.
 
plym49.2 said:
There hasn't been a heater core since I put it back together because the plenum is still not installed. Evaporator core just there in the open.

At first I ran a heater hose from the intake to the rad. Straight shot. That resulted in the hotter running.

Now that circuit is blocked off. And experiencing the cooler running.

I still don't understand it - the running cooler part of it. The running hotter the first way makes sense.
Click to expand...
do you mean like "now it is running cooler than the tstat should be opening at"?
if you overheat tstats they often get screwed up
stick a new one in there and it'll be at 195 where it should be
 
1oddtech said:
Sigh

I explained why you were over heating bypassing the heater core and are not overheating when you blocked the flow. If you don't understand that please put the tools down and get some one who knows what they are doing to finish repairing your truck, you obviously can't do it.
Click to expand...
You obviously are more interested in puffing out your chest and acting the big man than paying attention.

Now instead of trying to act tough and infallible, go back and read it again. It's OK if you point at the words and move your lips.
 
[486] said:
do you mean like "now it is running cooler than the tstat should be opening at"?
if you overheat tstats they often get screwed up
stick a new one in there and it'll be at 195 where it should be
Click to expand...
Yep, that makes sense. t-stat is stuck open.
 
plym49.2 said:
You obviously are more interested in puffing out your chest and acting the big man than paying attention.

Now instead of trying to act tough and infallible, go back and read it again. It's OK if you point at the words and move your lips.
Click to expand...
Welcome to chit chat
 
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