smog pump
Posting Guru
Joined: Nov 2008
Posts: 1,190
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Since I did my hydraboost brake conversion my vacuum pump is on the way out again.
Defrost only untill the pump warms up and starts making vacuum again.
Given the cost of a vacuum pump, I can live with defrost only, that is where it usually is anyway until I reach operating temp in the winter.
Defrost only untill the pump warms up and starts making vacuum again.
Given the cost of a vacuum pump, I can live with defrost only, that is where it usually is anyway until I reach operating temp in the winter.
Postmaster
Joined: Apr 2008
Posts: 4,802
Likes: 1
How are your brakes man? If the brake assist feels good then vacuum pump should not be on your suspects list. I'm thinking more likely tis a vacuum leak in the vent selector head behind the dash, the one that's operated by the levers you slide left-right.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
On the early model trucks the coolant circulates through the heater core constantly if the engine is running.
So a bad seal on one of the heater doors, or the door being out of adjustment could be your problem.
For about 20 years I have been meaning to put a manual valve on mine to stop the coolant in the summer, but it still is not done.
So a bad seal on one of the heater doors, or the door being out of adjustment could be your problem.
For about 20 years I have been meaning to put a manual valve on mine to stop the coolant in the summer, but it still is not done.
Postmaster
Joined: Apr 2008
Posts: 4,802
Likes: 1
I have a valve from a Ranger, tis vacuum controlled and I have it T-eed with the recirculating door servo - that one gets vacuum only when the HVAC is set to "off" or "max A/C", so in those two positions I have very little flow through the heater core.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Been meaning to do a mod like that since I first heard about it. Never gets done because I don't have the time for much tinkering anymore. This weekend is booked for some F350 rear springs if all goes well and work weeks are getting longer. I guess since I'll be at the wreckers anyway, I'll try and remember to look for that valve if there is a ranger or exploder thats new enough.
I noticed the air intake for the climate control when set to max is actually between the kick panel and the heater core housing. I know the ABS plastic housing is a decent insulator, but there has to be some heating going on there as the air goes past the heater core housing on its way to the evaporator core.
I measured a 4 degree celcius difference between the dryer under the hood in the engine bay and the air vents in the truck. That is a difference that you do notice on hotter days.
I noticed the air intake for the climate control when set to max is actually between the kick panel and the heater core housing. I know the ABS plastic housing is a decent insulator, but there has to be some heating going on there as the air goes past the heater core housing on its way to the evaporator core.
I measured a 4 degree celcius difference between the dryer under the hood in the engine bay and the air vents in the truck. That is a difference that you do notice on hotter days.
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Bmbiehler
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Jun 27, 2010 11:43 PM
