How do I install switch to turn on Cooling Fans

[Rolm]

I just picked up the over-ride harness to-day and it looks like it is plug and play I will install the switch in a few days and give an update

[Rolm]

I installed the hi low fan harness and it works like a charm. On the low side the fans run very slow and quite on the high side the fans come to life and blow like crazy. I can't see me having cooling problems from this point on. I also think I found my over-heating problem the dam cooling fans never came on. on high speed, there must be a swithch or a relay that died a long time ago. I will bet that was the problem all along, My money is that the other guys that were having overheating problems may have lost their high speed fuse or relay. Can anyone tell me were the high speed fuse or relay is I am curious at this point even though I fixed the overheating in a manual way. late

[Hoppy2]

Rolm,

I am glad that the by pass worked well for you, but am amazed that the fans run at two speeds. I have never heard of that, but am glad that I know that. I will monitor my system to see how it works. Unfortunately, the summer is almost gone now and we will probably not need any high speed fans in the near future.

I just have to try to figure out what to do with my vacuum cleaner in the front end of my Intrigue now. The AIR pump. Ach!

I'd like to know where that high speed fuse/switch/relay is as well.

[Rolm]

Originally Posted by Hoppy2

Rolm,

I am glad that the by pass worked well for you, but am amazed that the fans run at two speeds. I have never heard of that, but am glad that I know that. I will monitor my system to see how it works. Unfortunately, the summer is almost gone now and we will probably not need any high speed fans in the near future.

I just have to try to figure out what to do with my vacuum cleaner in the front end of my Intrigue now. The AIR pump. Ach!

I'd like to know where that high speed fuse/switch/relay is as well.

You can try this: start your engine and turn on you A/C and open the hood and let us know if the fans are running on Hi or very low, my fans run very slow to a point were you can't hear them run.

[Rolm]

Well guys here in Toronto today is was quite hot and yes I did get stuck in traffic for abought 20 minutes. No problem I turned on my cooling fans and presto the temp stayed just below the 1/2 way point. The manual switch works great. On spec I found the cooling fan relays I will start replacing one at a time and see if I can solve the over-heating problem and post the results in the hopes of helping others out with over-heating problems. later

[LittleHoov]

If you can get ahold of a Factory Service Manual it would probably tell which relay controls what. It seems like there was someone here who had one at some point.

[Hoppy2]

Hot in Toronto! Ha, We had frost last night in Niagara! Glad to hear your bypass works. If you find the relays let me know. That is a good thing to know.

[fhofstra]

If it helps -- here's what my 2000 Intrigue shop manual schematic (pg 6-380) shows. Two fuses and three relays are involved in this, all in the "underhood accessory wiring junction block" (fuse box on right tower). Slow fan speed is done with cool fan relay 1 activated by the PCM, with power supplied by the cool fan 1 (40amp) fuse. This feeds 12VDC through the relay to the two fans in series (6V each); thus the slower fan RPM. For high speed, the PCM activates cool fan relay 2 and cool fan relay 3 simultaneously. Cool fan relay 1 remains activated to continue providing 12V to fan motor #1 (RH). Cool fan relay 2 grounds fan motor #1 (RH), so it gets the full 12V instead of 6V. Cool fan relay 3 provides 12V to fan motor #2 (LH), already (permanently) grounded, through cool fan 2 (30A) fuse. Just for the record, I checked my fuse box, and find both fuses are 25A, not 40 and 30 as the schematic indicates.

[xeroinfinity]

Your service manual should also say this...

The PCM commands Low Speed Fans ON under the following conditions:

The engine coolant temperature exceeds approximately 106°C (223°F).
The A/C refrigerant pressure exceeds 1310 kPa (190 psi).
The vehicle is shut off when the engine coolant temperature is greater than 140°C (284°F) and system voltage is more than 12 volts. The fans will stay ON for approximately 3 minutes.

The PCM commands High Speed Fans on under the following conditions:

The engine coolant temperature reaches 110°C (230°F).
The A/C refrigerant pressure exceeds 1655 kPa (240 psi).
Or When certain DTCs set.

glad to hear you got the fan switch working Rolm !

[Rolm]

Ok with the above info what would be causing my over-heating problem. So if you were to guess which relay should I replace. All the fuse are ok, relays are tough to check. As I said I will go to the bone yard and pull out the 3 relays and replace one at a time. I have one question should the PCM be re-flashed every few years.

[Rolm]

I finally fixed my over-heating problem even though it was in a round abought way, see links above for the manual harness I bought on Craig’s list. I set the cooling fans to run all the time on low speed and that keeps my engine temp at the exact tem that the thermostat is designed for just under the half-way point. Bottom line all the other guys that had over heating problems had the same issue as I. The dam fans did not come on soon enough I would have to assume that the computer was lazy or it did not turn on the fans when it should have. Can any one fix the problem the proper way and not the way I did it in a round abought way.