Not your normal A/C problem
Not your normal A/C problem My a/c will come on and run sometimes. It has been running and blowing cold then the air from vents gradually gets warm. Turn A/C off, wait a while turn back on and will work but does same thing over time. Cannot always repeat this. Sometimes I cannot get compressor to engage at all.
Things I have done are: check coolant level, replaced radiator(small crack), Check level again, replace wire and plug to coolant temp sensor (when you touched the wire/connector idle would drop, has since fixed that problem), fans are all working(sometimes will run at 1st start up of day, not sure why, maybe related) if I unplug the pressure sensor on a/c line, compressor usually kicks on, then turns off. Swapped relays around everything still works as should. I had system evac and refilled with dye and no leaks found yet. Pressures read
100 low side static
91 high side static
29-30 low side comp running
148-175 high side running (1st check 175 then checked again at home with same gauges 148, I think I had the valve open on both and let it equalize, low side shot up)
temp on dash guage 210 constant(I know, not accurate)
I have researched this for about 2 weeks now (bought car off of member here with blown motor and purchased long block from him and had him rebuild motor and install) A/c has not worked normally since purchase.
things I know I need to look at are the a/c pressure switch and coolant temp sensor. I hope I didn't miss anything. Sorry so long but could someone maybe point me in the right direction. Thanks
Things I have done are: check coolant level, replaced radiator(small crack), Check level again, replace wire and plug to coolant temp sensor (when you touched the wire/connector idle would drop, has since fixed that problem), fans are all working(sometimes will run at 1st start up of day, not sure why, maybe related) if I unplug the pressure sensor on a/c line, compressor usually kicks on, then turns off. Swapped relays around everything still works as should. I had system evac and refilled with dye and no leaks found yet. Pressures read
100 low side static
91 high side static
29-30 low side comp running
148-175 high side running (1st check 175 then checked again at home with same gauges 148, I think I had the valve open on both and let it equalize, low side shot up)
temp on dash guage 210 constant(I know, not accurate)
I have researched this for about 2 weeks now (bought car off of member here with blown motor and purchased long block from him and had him rebuild motor and install) A/c has not worked normally since purchase.
things I know I need to look at are the a/c pressure switch and coolant temp sensor. I hope I didn't miss anything. Sorry so long but could someone maybe point me in the right direction. Thanks
My a/c will come on and run sometimes. It has been running and blowing cold then the air from vents gradually gets warm. Turn A/C off, wait a while turn back on and will work but does same thing over time. Cannot always repeat this. Sometimes I cannot get compressor to engage at all.
Things I have done are: check coolant level, replaced radiator(small crack), Check level again, replace wire and plug to coolant temp sensor (when you touched the wire/connector idle would drop, has since fixed that problem), fans are all working(sometimes will run at 1st start up of day, not sure why, maybe related) if I unplug the pressure sensor on a/c line, compressor usually kicks on, then turns off. Swapped relays around everything still works as should. I had system evac and refilled with dye and no leaks found yet. Pressures read
100 low side static
91 high side static
29-30 low side comp running
148-175 high side running (1st check 175 then checked again at home with same gauges 148, I think I had the valve open on both and let it equalize, low side shot up)
temp on dash guage 210 constant(I know, not accurate)
I have researched this for about 2 weeks now (bought car off of member here with blown motor and purchased long block from him and had him rebuild motor and install) A/c has not worked normally since purchase.
things I know I need to look at are the a/c pressure switch and coolant temp sensor. I hope I didn't miss anything. Sorry so long but could someone maybe point me in the right direction. Thanks
Things I have done are: check coolant level, replaced radiator(small crack), Check level again, replace wire and plug to coolant temp sensor (when you touched the wire/connector idle would drop, has since fixed that problem), fans are all working(sometimes will run at 1st start up of day, not sure why, maybe related) if I unplug the pressure sensor on a/c line, compressor usually kicks on, then turns off. Swapped relays around everything still works as should. I had system evac and refilled with dye and no leaks found yet. Pressures read
100 low side static
91 high side static
29-30 low side comp running
148-175 high side running (1st check 175 then checked again at home with same gauges 148, I think I had the valve open on both and let it equalize, low side shot up)
temp on dash guage 210 constant(I know, not accurate)
I have researched this for about 2 weeks now (bought car off of member here with blown motor and purchased long block from him and had him rebuild motor and install) A/c has not worked normally since purchase.
things I know I need to look at are the a/c pressure switch and coolant temp sensor. I hope I didn't miss anything. Sorry so long but could someone maybe point me in the right direction. Thanks
Fix it.
Coolant temp sensor has nothing to do with the A/C system.
Is the pressure switch the cause of the problem? The reason I mentioned the coolant temp sensor was I thought I read in another post that if it is reading incorrectly (or correctly)it will trigger the fans which will in turn shut down the a/c? Is this correct?
But yes, the coolant temp sensor can cause the fans to go on and off and freak out if its going bad. But as far as I know, it has no ties with the a/c compressor.
Change both.
be sure to check the expansion valve too, its a long shot but if the valve begins to open more then normal it will cause the high pressure side to drop and cause the low side to come up. I had the same problem with mine.
