AC compressor cycling when in heat mode - 1995 Dodge Ram 1500 316cid

From : rocdad

Q: i noticed cooler air coming out of my floor vents while the passenger compartment heater was on. thinking i maybe low on coolant i opened the hood and checked radiator fluid which was fine but i noticed ac compressor was cycling double checked controls all seems fine any help would be appreciated. bob 1995 dodge ram 1500 316cid .

Replies:

From : ed medlin ed edmedlin com

i noticed cooler air coming out of my floor vents while the passenger compartment heater was on. thinking i maybe low on coolant i opened the hood and checked radiator fluid which was fine but i noticed ac compressor was cycling double checked controls all seems fine any help would be appreciated. bob 1995 dodge ram 1500 316cid i have the same truck/engine and my ac compressor turns on whenever i have ac or heat on. it does cycle cooler air if the heater gets to where the thermostat is set. as long as it does produce the heat you want i am pretty sure it is normal. ed .

From : rocdadrocdad

on nov 9 919=a0am ed medlin ed@ edmedlin.com wrote i noticed cooler air coming out of my floor vents while the passenger compartment heater was on. thanks ed! thats reassuring however it seemed to be blowing warm at best on the full heat setting when i disconnected the ac fan clutch i got hot air...also noticed the ac lines icing up before i pulled the plug. its got me thinking about just what the interior heat control controls is it actually connected to a thermostat or is just a hot water flow valve when turned on the hot side bob thinking i maybe low on coolant i opened the hood and checked radiator fluid which was fine but i noticed ac compressor was cycling double checked controls all seems fine any help would be appreciated. bob 1995 dodge ram 1500 316cid i have the same truck/engine and my ac compressor turns on whenever i hav= e ac or heat on. it does cycle cooler air if the heater gets to where the thermostat is set. as long as it does produce the heat you want i am pret= ty sure it is normal. ed .

From : john kunkeljohn kunkel

thanks ed! thats reassuring however it seemed to be blowing warm at best on the full heat setting when i disconnected the ac fan clutch i got hot air...also noticed the ac lines icing up before i pulled the plug. its got me thinking about just what the interior heat control controls is it actually connected to a thermostat or is just a hot water flow valve when turned on the hot side there is no hot water flow valve water flows through the heater core continuously; the heat control operates a blend door to control heat/cool. the compressor is energized in the defrost and floor/defrost modes to dehumidify the air if the hot air is only warm it might be a faulty engine coolant thermostat or a misadjusted blend door. .

From : bryan

the a/c works in defrost like john stated. as long as the engine does not overheat or run cold to long code p0128. i would remove the two heater hoses from the heater core and either reverse them or use your garden hose to reverse flush the heater core. chances of it being restricted are better then a issue with the cable for the blend air door and it is easier to try before removing the dash. bryan i noticed cooler air coming out of my floor vents while the passenger compartment heater was on. thinking i maybe low on coolant i opened the hood and checked radiator fluid which was fine but i noticed ac compressor was cycling double checked controls all seems fine any help would be appreciated. bob 1995 dodge ram 1500 316cid .