TRD Radiator Cap

Question. My stock radiator cap was over 10 years old. Saw a couple posts on them breaking due to age. When I went to order a new one I saw this model. Figured I would get an extra .00001 horsepower out of it.

Since I have put it on my truck my heat works REALLY well. It gets a lot hotter in the cab.

I noticed the old cap had 16 psi and this one has 18.5 psi.

I work think the only way to make it hotter in the cab would be to put a different thermostat that opens at a higher temperature on it.

Any ideas or is it just my imagination?

 

I didn't notice that when I switched to a TRD cap.

 

Must be my imagination. But every time I drive it I have to turn the heat down. Runs me out of the cab on where I used to have the knobs set. Could not understand how higher pressure at the cap would make it run hotter. Thanks.

 

The heater works by blowing air through the heater core which has hot coolant running through it. If your coolant is running at a higher temp (and quicker to get to that temp), I suppose you'd feel it more in the cab...

 

Higher pressure cap puts a little more stress on the seals, hoses, gasket, and other components. It also increases the boiling point by a few degrees. Could be the higher pressure circulates faster through the heater core giving you more heat because the airflow can't reduce the temperature as fast as before.

 

Should "cool better" as there is now higher flow with the cap's pressure increase. These are recommended on boosted or towing applications. Won't hurt a thing but because water is efficient, it will find leaks if you have any...