Chevy Impala SS Forum banner
1 - 20 of 23 Posts

· Premium Member
Joined
·
5,523 Posts
EDIT : all the below is ASSuming you have a 1996 Impala or Caprice

If you have a Caddy or RM , you should have mentioned that as this is a Impala SS forum.



Rectangle Font Line Parallel Diagram


As you can see the HVAC switch on the dash should only request the AC compressor in , MAX, NORM, BI-LEVEL, and DEFROST

If you are indeed having the AC clutch cycle in the heat position , I would suggest trying this,

While the car is running and the AC is cycling in the HEAT or VENT position, unplug the plug on the accumulator drier.

If it continues to do it, something really weird is going on and further checks will be needed.

If it stops, then you want to look at dash switch operation.

With the plug disconnected ,put a incandescent bulb test light in the green wire side of the pressure switch plug.
Key on , engine off put the switch in each position noting the light on or off.
correct operation , the light should be out in OFF , VENT, , HEAT
 

· Registered
Joined
·
8,077 Posts
Heat already blows thru vents w/o doing that. Suspect problem began with control swap.
 

· Registered
Joined
·
11,703 Posts
The AC runs when the heat is on. It seems that GM likes to run the air through the AC to dehumidify it, and then heat it. It keeps the windows clear in winter. I believe you can choose which vents you want the air to flow through with all models.
 
  • Like
Reactions: WagonmaSSter

· Registered
Joined
·
8,077 Posts

· Registered
Joined
·
7,013 Posts
On an unaltered Fleetwood simply push the ECON button to remove the A/C compressor from the equation. Push the AUTO button to resume its function. 'Defrost' automatically engages hi motor speed, points the majority of air to the windshield and dash side window vents, and kicks over to AUTO with compressor operation for aforementioned de-fogging.

Strongly recommend leaving control to ECON to keep compressor from short-cycling and burning itself and the clutch up.

Well last i check i seen a caprice. Roadmaster and a cadillac on the main picture???
Juuuuust a short time before you joined, the platform changed hands and the header went from ~11 cars to the 4 up there currently.
 
  • Like
Reactions: BIGBODY9SIX

· Registered
Joined
·
11,703 Posts
Again not on the cadillac fleetwoods thats why people do the roadmaster control swap because it has the option to blow heat threw the front vents
That has nothing to do with the compressor running when the heat is on, which is the original topic of this thread. GM has, in their infinite wisdom, decided to have the compressor run and put the air through the evaporator before heating it.
 

· Registered
Joined
·
3 Posts
On an unaltered Fleetwood simply push the ECON button to remove the A/C compressor from the equation. Push the AUTO button to resume its function. 'Defrost' automatically engages hi motor speed, points the majority of air to the windshield and dash side window vents, and kicks over to AUTO with compressor operation for aforementioned de-fogging.

Strongly recommend leaving control to ECON to keep compressor from short-cycling and burning itself and the clutch up.


Juuuuust a short time before you joined, the platform changed hands and the header went from ~11 cars to the 4 up there currently.
Not to be funny about the group picture,cuz although as mentioned,it IS a IMPALA SS forum,..which coincidentally includes the other B-body cars,Caprice,Fleetwood and Road Master sub-groups…why not have an Impala in the forefront and the other 3 in the background (sub-groups) ? Just a suggestion that may help with the platforms that are included in the forum🤷🏾‍♂️
 

· Registered
Joined
·
8,077 Posts
Just like the LT1 pages where folks assume everyone has an F-Body....
 
1 - 20 of 23 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top