The Chrysler Minivan Fan Club Forums banner

1 - 19 of 19 Posts

·
Registered
Joined
·
13 Posts
Discussion Starter #1
Well, it's summer, and the same problem has become a major issue.

We have an 08 Grand Caravan SXT with 3.8L engine.

When the AC is switched on, the compressor clicks on.
HOWEVER, the radiator fan does not turn on with the compressor.

The rad fan only comes on when the engine gets hot, and it works well to keep the engine temps down. HOWEVER, it is only one speed (a low speed).

When I disconnected the coolant temp sensor and started the engine, the fan came on immediately, and at high speed. It came on even though I didn't have the AC on.

What does this all mean?
Is it a faulty coolant temperature sensor?
Or is there a relay activated by the compressor that has failed.

Appreciate any help.
 

·
Super Moderator
Joined
·
2,131 Posts

·
Registered
Joined
·
13 Posts
Discussion Starter #3
Thanks for the link and the response.
I have two other questions that I hope you might be able to answer.
BTW, I swapped out the high speed fan relay (by the top driver's side corner of the radiator) with a known good 5-terminal relay, and it did not make any difference.

1) Can you tell me what is the significance of the high speed fan coming on when I disconnected the coolant temp sensor? I saw this in another thread.

2) This problem existed last year, but the AC always was cold. However, this year, I have been having to recharge the system, so I suspect a leak. I saw on another thread that there is a common problem to these vans about a hose that leaked, and was redesigned and replaced by the dealership. Was this a recall?

Thanks.
 

·
Registered
Joined
·
1,008 Posts
Thanks for the link and the response.
I have two other questions that I hope you might be able to answer.
BTW, I swapped out the high speed fan relay (by the top driver's side corner of the radiator) with a known good 5-terminal relay, and it did not make any difference.

1) Can you tell me what is the significance of the high speed fan coming on when I disconnected the coolant temp sensor? I saw this in another thread.

2) This problem existed last year, but the AC always was cold. However, this year, I have been having to recharge the system, so I suspect a leak. I saw on another thread that there is a common problem to these vans about a hose that leaked, and was redesigned and replaced by the dealership. Was this a recall?

Thanks.
Hi baloo,
You can visit our Mopar Owner Connect website and enter your VIN to see if there are any open recalls for your particular vehicle. https://www.moparownerconnect.com/oc/us/en-us/sub/Pages/RecallsQuery.aspx. If you have any additional questions, please feel free to PM me!
 

·
Registered
Joined
·
462 Posts
Any progress?

Our '08 van with dual zone A/C has the same issue. Yesterday it was 90F outside. I started the van and drove the first 15 minutes or so in city traffic, more stop than go, and not above 20mph when going. A meat thermometer in the front vent read 70F. That was even after setting the A/C to recirculate mode. The engine temperature gauge warmed up and got to center position, then stays there. I don't hear the engine fan turn on. Then on to the highway, 65mph, and the vent thermometer quickly cools to 50F over maybe 1 minute, then slowly cools to 40F over the next 5 minutes. If I stop in traffic, the vent starts to warm up.

If I idle the van in my driveway, eventually the engine fan does cycle on and off. The fan works fine. I separately checked the fan relay, it's functional. The engine fan needs to come on to remove heat from the A/C condensor, but it doesn't come on. With good A/C condensor cooling on the highway, the A/C functions ok. In city driving with little to no air flow over the A/C condensor, it's miserable.

What to check? Wiring, a sensor, a module, Toyota, ... ?
 

·
Registered
Joined
·
2,654 Posts
On some cars the fan will only come on when the AC compressor pressure builds up to a certain level. That said, you just may be low on freon. Check pressure.
 

·
Registered
Joined
·
462 Posts
Thanks for the suggestion. I have a shop manual for the van, will look for a pressure sensor and how to test it. Earlier in the summer I did attach an external pressure gauge and the A/C was operating normally. I don't recall the pressure numbers I was getting, but the gauge was swinging in a sensible range.
 

·
Registered
Joined
·
7 Posts
I have a 2010 Grand Caravan that has that same issue. I've traced it down to the PCM not providing the ground to the low speed relay, but that's as far as I can go.

Anyone have any more ideas? or is it take it to the dealer and get them to hook up to it?

No AC sucks.

:)
 

·
Registered
Joined
·
3 Posts
Having no airflow over the condenser when the AC compressor is engaged and on the coldest setting possible is not normal operation.
 

·
Registered
Joined
·
1,008 Posts
Have a 2015 caravan with this exact issue, did anyone actually find a solution?
Sorry to hear of the trouble you’re experiencing with your van, redlt4. We suggest having your dealer inspect this concern if you have not done so already. We are also available via private message if you would like any additional assistance during that process.

Mark
Chrysler Social Care Specialist
 

·
Registered
Joined
·
208 Posts
Having no airflow over the condenser when the AC compressor is engaged and on the coldest setting possible is not normal operation.
The fan doesn't run on my 2012 unless the pressure get's too high.
A low Freon charge can be enough to run the compressor but not enough to trip the fan.
56348
 

·
Registered
Joined
·
3 Posts
The fan doesn't run unless the pressure get's too high.
A low Freon charge can be enough to run the compressor but not enough to trip the fan.
View attachment 56348
You may be correct about the high pressure and fan operation, I will look into this, but this chart indicates a variable speed fan. The 2015 model has only 2 fan speeds and 2 relays(one for each speed). There is no duty cycle or variable control to it. The TIPM is in control of both relays. The low speed relay works when engine temp comes up enough. The TIPM will not however trigger high speed that I have seen and I know the AC pressure is spiking with no airflow over the condenser as I was able to read the low pressure side. I can also bypass the TIPM by grounding the control wire to the relay. This makes the fan come on high and the AC work great.
 

·
Registered
Joined
·
459 Posts
As long as the AC performs normally and the coolant temp stays in the normal range, the high speed fan operation is not necessarily required and just because the high speed fan doesn't kick on the moment AC is turned on, doesn't mean something is broken.

If the AC performance in stop&go traffic suffers, and the fan doesn't kick on, the system may be low on refrigerant.
Looking at the chart posted by ted928, the high speed fan operation is linked to AC system high pressure, a low refrigerant level may lower that pressure to the point when it doesn't reach the trigger point.
 

·
Registered
Joined
·
208 Posts
You may be correct about the high pressure and fan operation, I will look into this, but this chart indicates a variable speed fan. The 2015 model has only 2 fan speeds and 2 relays(one for each speed). There is no duty cycle or variable control to it. The TIPM is in control of both relays. The low speed relay works when engine temp comes up enough. The TIPM will not however trigger high speed that I have seen and I know the AC pressure is spiking with no airflow over the condenser as I was able to read the low pressure side. I can also bypass the TIPM by grounding the control wire to the relay. This makes the fan come on high and the AC work great.
My 2012 also has two relays and is definitely variable speed. Hopefully your problem is simply a low A/C charge and not a failed TIPM.
 

·
Registered
Joined
·
22 Posts
Have kinda the same issue here ac its cold on highway but just fresh at traffic i notice my fan doesnt come on full speed, it turns on but not on high however i heard there is a fan relay resistor that operates according to the temp in the radiator or condenser is mounted in the fan asembly how can i test it? Its the green connector at the corner
57657
 

·
Super Moderator
Joined
·
23,297 Posts
Check your low side A/C static pressure and operating pressure. Could be down some on refrigerant.

Lots of information here about the fan operation on a 4th Generation, I would expect similar for the 5th Generation:
 
1 - 19 of 19 Posts
Top