Overheating Problem with my 98 GS400
07-05-11, 05:57 PM
#1
Pit Crew
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Overheating Problem with my 98 GS400
1. My a/c has always blown a little warmer than it should ( about 2years). So last week I decided to add some refrigerant (R134). The a/c blew cold for a couple of days then back to just cool. I then added more refrigerant and now the a/c blow hot with no cooling at all.
2. An a/c tech checked it out with a gauge, and the low side looked fine, but the high side was going crazy (up and down). He then released some refrigerant from the system, but the a/c still blew hot and I was told I need a new compressor.
3. Now after driving around for a day I realized my fans were not turning on and my car would overheat. Replaced the thermostat/ rad. cap and coolant flush.
Still the fans do not come on. Even unplugged the radiator temp sensor and they still do not come on. Also bleed the cooling system. When I try to turn the a/c on full blast to get the fan to run it turns on for 2 seconds and turns off repeatedly along with the compressor.
I have no clue what to do, and would like to know what might be them issue before taking it to the shop. I can diy the compressor, but what can I do to get my fans running so my baby stops overheating.
Any imput will be greatly appreciated.
2. An a/c tech checked it out with a gauge, and the low side looked fine, but the high side was going crazy (up and down). He then released some refrigerant from the system, but the a/c still blew hot and I was told I need a new compressor.
3. Now after driving around for a day I realized my fans were not turning on and my car would overheat. Replaced the thermostat/ rad. cap and coolant flush.
Still the fans do not come on. Even unplugged the radiator temp sensor and they still do not come on. Also bleed the cooling system. When I try to turn the a/c on full blast to get the fan to run it turns on for 2 seconds and turns off repeatedly along with the compressor.
I have no clue what to do, and would like to know what might be them issue before taking it to the shop. I can diy the compressor, but what can I do to get my fans running so my baby stops overheating.
Any imput will be greatly appreciated.
07-06-11, 02:13 AM
#2
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That is wierd, the same exact thing happened to me about a month ago...i got my AC re-charged, and my fans stopped coming on.
i unplugged both harnesses for the fans, disconnected the battery, re-connected everything and they started working normal again. its been a month with no issues. i have no idea what caused it
i unplugged both harnesses for the fans, disconnected the battery, re-connected everything and they started working normal again. its been a month with no issues. i have no idea what caused it
Last edited by Clear2Cloz; 07-06-11 at 02:16 AM.
07-06-11, 10:10 AM
#4
Pit Crew
Thread Starter
That is wierd, the same exact thing happened to me about a month ago...i got my AC re-charged, and my fans stopped coming on.
i unplugged both harnesses for the fans, disconnected the battery, re-connected everything and they started working normal again. its been a month with no issues. i have no idea what caused it
i unplugged both harnesses for the fans, disconnected the battery, re-connected everything and they started working normal again. its been a month with no issues. i have no idea what caused it
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05-06-18, 07:49 PM
#8
Pole Position
Anyone know what the master relay looks like?
Would like to replace this on my GS4 as wwll
Would like to replace this on my GS4 as wwll
05-07-18, 07:42 PM
#9
Driver School Candidate
Fans operate with a temp sensor, usually in the radiator. There is also a relay, either could be faulty, the ecm tells the fans when to operate. The 134a systems can not be topped off with refrigerant like an old r-12, the amt is precise. To much, will not cool.just like to little, If the fans are not working, ac will not cool. Sounds like you have a refrigerant leak, compounded by a faulty fan system. If fans do not work,high side pressure will force refrigerant out pop off valve. This is not a DIY, you will need a competent shop, an honest one. Repair fans first, then service ac with correct equipment. If you are luck you will not have a leak.
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