How long does your M20 take to warm up?

[dashboardmonkey]

about 5 minutes, then the heat actually starts blowing hot air

[jlevie]

About 5 minutes in 40F ambients. It sounds like your thermostat may be stuck partially open and/or the fan clutch has seized. Replace the thermostat with an 80C unit and check the fan clutch.

[StereoInstaller1]

20 minutes is excessive, and will kill your fuel economy.

A new thermostat would be a good idea.

[allwheeldrive]

Mine is similar, takes longer here in winter, but just seems to be the way it goes. You could try a new t-stat to see if it helps. 20 minutes seems excessive.

[etxxz]

florida right now winter time.. ~5min. ^^ good idea on the swap. the sooner you do it, the more time you'll enjoy it ; /

[transatlantic0207]

87is here and my car is pretty consistent in its warm up time, it takes about 6-10m of casual driving from morning start. I always keep it below 3k before it's warmed up.

[McGyver]

my cabbie reaches a good temp in 10 minutes of back county road driving, but i also rev it up to 4k. probably not the best way to treat my engine, but if it breaks then i will just have to start the s52 swap.

[Sagaris]

I haven't had my 325 for very long but when it was a little warmer outside (50F-80F) I could get up to operating temp in a reasonable amount of time.

Now that it is colder (20F-40F) I will just barely reach operating temp. after my 20 minute commute which consists of 15 min. of city traffic and 5 min of freeway driving. (keeping the revs below 2500 until OP. Temp.)

My other car (Toyota) has an aluminum block + head and will reach operating temp. after 10 minutes, or halfway through my commute which seems normal.

I know my M20 is an iron block and will take longer to warm up due to the properties of iron. I wanted to see what it takes to get your car up to operating temp. when it is cold outside. to see whether it is worth replacing the thermostat or not.