AC causes car to over heat
- Thread starter bdemat
- Start date
I agree with General karthief, your fan and shroud look fine. The fan needs to be in the cylinder section of the shroud. If it is not it will not pull air. Yours is fine.
Looking at the pics, how old is the rad and how thick is the core?
I would get a very small screwdriver or thin putty knife and try to clear that paint out of your condenser.
Another thing to check if your A/C is charged enough, when car is idling with A/C on Max does the clutch stay engaged for long periods of time. If not (it cycles on/off often) you likely are low on refrigerant. I just did this on my truck. It was same thing, cooler when moving and less cool when stopped. I added a 9oz can of refrigerant to my truck and now will blow cold (will get down to 6 degrees Celcius out vents).
Looking at the pics, how old is the rad and how thick is the core?
I would get a very small screwdriver or thin putty knife and try to clear that paint out of your condenser.
Another thing to check if your A/C is charged enough, when car is idling with A/C on Max does the clutch stay engaged for long periods of time. If not (it cycles on/off often) you likely are low on refrigerant. I just did this on my truck. It was same thing, cooler when moving and less cool when stopped. I added a 9oz can of refrigerant to my truck and now will blow cold (will get down to 6 degrees Celcius out vents).
Last edited:
I bet you have two problems
#1 ac low on feon
#2 you may or may not have an overheating problem, you need to put a mechanical temp gauge on it to see actual temp numbers, you can zip tie it to the wiper arm temporarily.
It would not be unusual for the engine temp to get to 210-215 sitting still with ac on.
And I'm betting you have under drive pulleys too.
#1 ac low on feon
#2 you may or may not have an overheating problem, you need to put a mechanical temp gauge on it to see actual temp numbers, you can zip tie it to the wiper arm temporarily.
It would not be unusual for the engine temp to get to 210-215 sitting still with ac on.
And I'm betting you have under drive pulleys too.
No underdrive pulleys. I am really at a loss at this point. Everything looks like it should be good. I am changing the Ac clutch bearing because it makes a lot of noice but i dont think it will make a difference.
Just went through this with my car, even though I don't have AC, it would run really hot while idling.
www.stangnet.com
Even though I had a new fan clutch on, it was new bad. Details in the thread what brand I was running and where I got a good one.
Engine - Another cooling system thread
Hey guys, I'm having an annoyance with my '84 Mustang. When going down the road, the cooling system has no problem keeping the engine cool (normally runs between 197-203 degrees) with a Motorcraft 195 thermostat. The problem starts when I have to sit and idle for more than a couple of...
www.stangnet.com
Even though I had a new fan clutch on, it was new bad. Details in the thread what brand I was running and where I got a good one.
I think 220* sitting still with the ac on would not be unusual, point the temp gun at the bottom of the radiator near the lower hose.
Temp measured at metal parts will be a few degrees higher than coolant temp. I've used a meat thermometer between the shroud and the radiator.
Temp measured at metal parts will be a few degrees higher than coolant temp. I've used a meat thermometer between the shroud and the radiator.
Mindseye007
5 Year Member
I had a similar problem I fixed it by getting a flex a lite electric fan installed https://www.flex-a-lite.com/direct-...-electric-fan-for-1979-1993-ford-mustang.html my overheating problems are solved are you running underdrive pulleys? I run underdrive pulleys with no problems at all.
Similar threads
