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Air Cond Problems[700/87] posted by JohnR on
Monday, 14 December 1998, at 9:29 p.m.
I have got the climate control air cond system on my 87 740T. At times the blower motor will just stop, then 10mins later it will start again. The Volvo dealer says it could be a faulty control module, which to replace is big $$$.
Does this diagnosis sound right?
If the control module is faulty, I was thinking of wiring up a seperate 12 volt power source to the blower motor so that on occasions when the blower stops I can just flick a switch and get the blower motor working again. (I assume the air cond compressor is not stopping when the blower motor stops - I havnt been able to confirm this yet)
JohnR
Re: Air Cond Problems[700/87] posted by abe crombie on
Monday, 14 December 1998, at 9:43 p.m.
You have ACC with the thumbwheel for temp selection? It's rare but possible.
If this is the case then the temp based fan delay switch may be the culprit. It is on the block immediately above starter. It grounds at 125 degrees +/-.
Another way to fix it with compromises but no $$ is to pull out the control panel and splice the white wire you will find going to a black lump together. This black lump is an incar temp switch that overrides the engine mounted one in hot weather. Splicing the wires together with a Scotch-lok will bypass the "don't blow till the water is warm" function but that is a minor inconvenience that may not be worth the $$ to fix correctly.