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Maintenance & Repair Climate Control Problems (Air Conditioning, Heat) - All Cars
791 messages, Last post on Aug 12, 2009 at 12:55 PM
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| I had a similar problem with my '01 Dakota. I'm not sure if it has the same evaporator configuration as the Grand Cherokee. The drain for the evaporator did not have a hose attached to it. It only extended about an inch from the firewall and the airstream was blowing the water back along the drain and into the cab. I attached a piece of hose to it and haven't had any problems since. | |
| I have a 1994 Toyota Camry. The car has a lot of miles on it but it's still in great shape. The only problem I currently have is that, whenever I put the air conditioner on, if it's a hot day outside, my water temperature guage will start to rise. I have to turn the AC completely off to get the car temperature to lower to a normal level. I have had the AC repaired once in the past to fix a leak. Any idea what could cause this problem? I'm fairly certain that my coolant level is full. | |
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the a/c uses something in the range of 10-15 HP to operate, depending on the size of the car and compressor. that is loading down your engine quite a bit, and the cooling system is not up to the task. what could it be? bad thermostat, dirt/bugs/guck blocking the radiator fins, bad fan motor or relay or dying fluid clutch, water pump marginal or worse, gutless coolant that is no longer a 50/50 mix due to age, internal blockages of the radiator, collapsed hose due to bad radiator cap... lots of things. a temporary aid is to put down the windows (so you don't die when you do the rest of this,) and turn the heater up full to act as an auxiliary radiator. but you will need to get after the real issue, which is the cooling system is not doing its job under stress. |
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| swschrad really covered it, for the most part. I'd start with coolant level and radiator cap, then go on to the rest. Don't be too surprised if you find the thermostat has been failing. | |
| My 1990 Toyota Celica loss most of its refrigerant and this triggered the auto-off sensor. I have refilled the air conditioner refrigerant but I do not know how to reset this sensor. Any help? | |
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This is a friends car. I got this info from his wife. I'll get to him tomorrow for a better explanation Anyway, the problem appeared to be the AC switching from vents to defrost intermittantly. Actual problem seems to be (per dealer) the AC reversing somehow, and sucking air back into the engine?? Doea any of this make sense (I really need to get a better explanation). ANyway, dealer was stumped, and actually decided to replace the engine! Chrysler corp. seems to have come up with another possibility that involves replaceing some sort of module. I will try to get a better explanation and post it tomorrow, but any initial thoughts will be appreciated. |
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| swschrad sugested to boslaw1 to change the thermostat but I think that bad thermostat would cause overheating with or without A/C on. After starting the engine, the temperature would rise constantly. Why would the thermostat fail only with the A/C on? Maybe I am wrong but anybody can explain this? | |
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| Sometimes when thermostats fail they are closed and no coolant can flow. Other times they are stuck wide open, and never even slow down the coolant. A failed thermostat that is partially closed and therefore partially open could let enough coolant go by to be adequate when the A/C is off, but not so when it is on. | |
| Thanks. I didn`t think about this third possibility. | |
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how in heck is the a/c going to run backwards? the compressor sure isn't, and the vapor phase isn't going to run backwards. it would seem to be impossible for the fan to run backwards since there is not a source of -12 volts anywhere to leak across a failed computer module output device and spin the fan backwards. I would suspect what's going on is the damper door system is not working according to hoyle. as for sucking air into the engine compartment... nah. not unless somebody took the input manifold hose off the air cleaner and took out the fan motor and duct-taped the hose into that big old hole. bad communications here from the shop. |
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