Temp. Skyrockets After New AC Compressor

Mustangbelle306 · 08-19-2002, 02:40 PM

Well I FINALLY had my new AC compressor installed and the system evacuated and recharged!!! I was sooo excited, I've spent many a day sweltering at traffic lights in 100 degree 90% humidity weather up until now

Here's the problem: The first night I drove it with the new AC was a relatively cool night, maybe 80 degrees, and within 2 minutes after I started out home, the temperature had shot up from 208 degrees to 240 degrees. I pulled over, and noticed that the fan was on when the AC was engaged, but shut off when I turned the AC off, even though the gauge was still reading 235. I thought the fan automatically engaged at 200 degrees?

(It has a stock thermostat, btw) Also, when I popped the hood on the side of the road, the engine didn't seem overly hot, and I had plenty of overheating issues with the original motor, so I know what an overly hot motor feels/drives like, etc.

The next day, I drove it again for about 20 minutes with the AC on, and the temp stayed around 208, which is the normal running temperature since summer started (still running OEM radiator

). One of my friends suggested that either my temp sensor is malfunctioning, or my friend that ran my Autometer temp gauge must have messed up somehow...but its been functioning fine for several months now.

Any ideas??? Seems like I fix one problem, and 3824784 more pop up?!?!?!!

GRRRRRR says Belle!!!!!!!!

mikew88gt · 08-19-2002, 03:14 PM

You really need to find out if it's just an indication problem or a heat problem. If it's only an indication problem you'll want to double check your connections. I don't know how your Autometer gauge is wired but you should be able check the temp sensor relatively easy with a meter.

PKRWUD · 08-19-2002, 03:19 PM

FYI:

Your fan works as such: It comes on low speed at 220, and shuts off at 200. If, while the low speed fan is on, the A/C is turned on, the fan jumps to high speed. Some systems allow the fan to always operate with the A/C, regardless of engine temp. Try driving around in traffic with the a/c off, and see if the fan comes on low. Then, while it's on, turn on the a/c, and see if the fan speed increases.

Post the results.

Take care,
~Chris

Mustangbelle306 · 08-19-2002, 05:06 PM

I will do so next week. I was fed up so I left the car garaged in Maryland (put her in time out

) and I will be returning on Friday.

Thanks for the quick response!

08-19-2002, 02:40 PM	#1
Mustangbelle306 Yay for Chickys Join Date: Feb 2001 Posts: 1,532	Temp. Skyrockets After New AC Compressor Well I FINALLY had my new AC compressor installed and the system evacuated and recharged!!! I was sooo excited, I've spent many a day sweltering at traffic lights in 100 degree 90% humidity weather up until now Here's the problem: The first night I drove it with the new AC was a relatively cool night, maybe 80 degrees, and within 2 minutes after I started out home, the temperature had shot up from 208 degrees to 240 degrees. I pulled over, and noticed that the fan was on when the AC was engaged, but shut off when I turned the AC off, even though the gauge was still reading 235. I thought the fan automatically engaged at 200 degrees? (It has a stock thermostat, btw) Also, when I popped the hood on the side of the road, the engine didn't seem overly hot, and I had plenty of overheating issues with the original motor, so I know what an overly hot motor feels/drives like, etc. The next day, I drove it again for about 20 minutes with the AC on, and the temp stayed around 208, which is the normal running temperature since summer started (still running OEM radiator ). One of my friends suggested that either my temp sensor is malfunctioning, or my friend that ran my Autometer temp gauge must have messed up somehow...but its been functioning fine for several months now. Any ideas??? Seems like I fix one problem, and 3824784 more pop up?!?!?!! GRRRRRR says Belle!!!!!!!!

08-19-2002, 03:14 PM	#2
mikew88gt Registered Member Join Date: Jul 1999 Location: New York State Posts: 242	You really need to find out if it's just an indication problem or a heat problem. If it's only an indication problem you'll want to double check your connections. I don't know how your Autometer gauge is wired but you should be able check the temp sensor relatively easy with a meter. __________________ Your basic carbed 302 with Edelbrock Performer heads, Performer RPM intake and 650 Speed Demon. My 1988 Mustang GT

08-19-2002, 03:19 PM	#3
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	FYI: Your fan works as such: It comes on low speed at 220, and shuts off at 200. If, while the low speed fan is on, the A/C is turned on, the fan jumps to high speed. Some systems allow the fan to always operate with the A/C, regardless of engine temp. Try driving around in traffic with the a/c off, and see if the fan comes on low. Then, while it's on, turn on the a/c, and see if the fan speed increases. Post the results. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

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08-19-2002, 05:06 PM	#4
Mustangbelle306 Yay for Chickys Join Date: Feb 2001 Posts: 1,532	I will do so next week. I was fed up so I left the car garaged in Maryland (put her in time out ) and I will be returning on Friday. Thanks for the quick response!