Quote:
Originally Posted by red-beard
If it was the fan clutch, wouldn't he also see the temp rise on the cooling water system? Several of my older cars had the hydraulic fan clutch and they definitely go bad.
|
If he had a stock radiator, but he has a larger radiator, a 3 or 4 row core I presume.
If the inside temp rises that fast, you have a vacuum leak, or the heater valve and or blend doors don't work properly. Both are vacuum operated. Sounds to me like the heater core is fighting the evaporator, raising the low side pressure.
Normally, if you can't bring down the low, the high won't come down as well. However, you can bring down the high with a fan to make the evap happier on the low. Using a water hose on the condenser, or a fan in your case, can help the system find an equilibrium where it's happy. This is what you are doing now.
Focus on the low side now.