Quote:
Originally Posted by X5chemist
The blower motor bearings are starting to fail. Mine whines at start up now and then. If you have a mechanical clutch, replace it if it's old. It will help with A/C cooling. Low pressure can be good, however high pressure is important too. At 100F, low pressure should be higher. It should be in the (45 is acceptable) 50-55 PSI range. 275-315 PSI on high side. My 3.0 has a brushless auxiliary and mechanical fan. Once the engine is to temp, it can maintain 42F in dead slow traffic and stop signs.
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Newtis says the low side should never be reading higher than 35 psi. I've put more in before and it causes the auxiliary fan to really run fast. When it's not crazy hot like it has been here the AC works fine.